Python email.generator() Examples

def test_as_string(self):
        eq = self.assertEqual
        msg = self._msgobj('msg_01.txt')
        fp = openfile('msg_01.txt')
        try:
            # BAW 30-Mar-2009 Evil be here.  So, the generator is broken with
            # respect to long line breaking.  It's also not idempotent when a
            # header from a parsed message is continued with tabs rather than
            # spaces.  Before we fixed bug 1974 it was reversedly broken,
            # i.e. headers that were continued with spaces got continued with
            # tabs.  For Python 2.x there's really no good fix and in Python
            # 3.x all this stuff is re-written to be right(er).  Chris Withers
            # convinced me that using space as the default continuation
            # character is less bad for more applications.
            text = fp.read().replace('\t', ' ')
        finally:
            fp.close()
        self.ndiffAssertEqual(text, msg.as_string())
        fullrepr = str(msg)
        lines = fullrepr.split('\n')
        self.assertTrue(lines[0].startswith('From '))
        eq(text, NL.join(lines[1:])) 

def test__all__(self):
        module = __import__('email')
        # Can't use sorted() here due to Python 2.3 compatibility
        all = module.__all__[:]
        all.sort()
        self.assertEqual(all, [
            # Old names
            'Charset', 'Encoders', 'Errors', 'Generator',
            'Header', 'Iterators', 'MIMEAudio', 'MIMEBase',
            'MIMEImage', 'MIMEMessage', 'MIMEMultipart',
            'MIMENonMultipart', 'MIMEText', 'Message',
            'Parser', 'Utils', 'base64MIME',
            # new names
            'base64mime', 'charset', 'encoders', 'errors', 'generator',
            'header', 'iterators', 'message', 'message_from_file',
            'message_from_string', 'mime', 'parser',
            'quopriMIME', 'quoprimime', 'utils',
            ]) 

def test_mime_attachments_in_constructor(self):
        eq = self.assertEqual
        text1 = MIMEText('')
        text2 = MIMEText('')
        msg = MIMEMultipart(_subparts=(text1, text2))
        eq(len(msg.get_payload()), 2)
        eq(msg.get_payload(0), text1)
        eq(msg.get_payload(1), text2)



# A general test of parser->model->generator idempotency.  IOW, read a message
# in, parse it into a message object tree, then without touching the tree,
# regenerate the plain text.  The original text and the transformed text
# should be identical.  Note: that we ignore the Unix-From since that may
# contain a changed date. 

def test_as_string(self):
        eq = self.assertEqual
        msg = self._msgobj('msg_01.txt')
        fp = openfile('msg_01.txt')
        try:
            # BAW 30-Mar-2009 Evil be here.  So, the generator is broken with
            # respect to long line breaking.  It's also not idempotent when a
            # header from a parsed message is continued with tabs rather than
            # spaces.  Before we fixed bug 1974 it was reversedly broken,
            # i.e. headers that were continued with spaces got continued with
            # tabs.  For Python 2.x there's really no good fix and in Python
            # 3.x all this stuff is re-written to be right(er).  Chris Withers
            # convinced me that using space as the default continuation
            # character is less bad for more applications.
            text = fp.read().replace('\t', ' ')
        finally:
            fp.close()
        self.ndiffAssertEqual(text, msg.as_string())
        fullrepr = str(msg)
        lines = fullrepr.split('\n')
        self.assertTrue(lines[0].startswith('From '))
        eq(text, NL.join(lines[1:])) 

def test_mime_attachments_in_constructor(self):
        eq = self.assertEqual
        text1 = MIMEText('')
        text2 = MIMEText('')
        msg = MIMEMultipart(_subparts=(text1, text2))
        eq(len(msg.get_payload()), 2)
        eq(msg.get_payload(0), text1)
        eq(msg.get_payload(1), text2)



# A general test of parser->model->generator idempotency.  IOW, read a message
# in, parse it into a message object tree, then without touching the tree,
# regenerate the plain text.  The original text and the transformed text
# should be identical.  Note: that we ignore the Unix-From since that may
# contain a changed date. 

def test__all__(self):
        module = __import__('email')
        # Can't use sorted() here due to Python 2.3 compatibility
        all = module.__all__[:]
        all.sort()
        self.assertEqual(all, [
            # Old names
            'Charset', 'Encoders', 'Errors', 'Generator',
            'Header', 'Iterators', 'MIMEAudio', 'MIMEBase',
            'MIMEImage', 'MIMEMessage', 'MIMEMultipart',
            'MIMENonMultipart', 'MIMEText', 'Message',
            'Parser', 'Utils', 'base64MIME',
            # new names
            'base64mime', 'charset', 'encoders', 'errors', 'generator',
            'header', 'iterators', 'message', 'message_from_file',
            'message_from_string', 'mime', 'parser',
            'quopriMIME', 'quoprimime', 'utils',
            ]) 

def test_as_string(self):
        eq = self.assertEqual
        msg = self._msgobj('msg_01.txt')
        fp = openfile('msg_01.txt')
        try:
            # BAW 30-Mar-2009 Evil be here.  So, the generator is broken with
            # respect to long line breaking.  It's also not idempotent when a
            # header from a parsed message is continued with tabs rather than
            # spaces.  Before we fixed bug 1974 it was reversedly broken,
            # i.e. headers that were continued with spaces got continued with
            # tabs.  For Python 2.x there's really no good fix and in Python
            # 3.x all this stuff is re-written to be right(er).  Chris Withers
            # convinced me that using space as the default continuation
            # character is less bad for more applications.
            text = fp.read().replace('\t', ' ')
        finally:
            fp.close()
        self.ndiffAssertEqual(text, msg.as_string())
        fullrepr = str(msg)
        lines = fullrepr.split('\n')
        self.assertTrue(lines[0].startswith('From '))
        eq(text, NL.join(lines[1:])) 

def test_mime_attachments_in_constructor(self):
        eq = self.assertEqual
        text1 = MIMEText('')
        text2 = MIMEText('')
        msg = MIMEMultipart(_subparts=(text1, text2))
        eq(len(msg.get_payload()), 2)
        eq(msg.get_payload(0), text1)
        eq(msg.get_payload(1), text2)



# A general test of parser->model->generator idempotency.  IOW, read a message
# in, parse it into a message object tree, then without touching the tree,
# regenerate the plain text.  The original text and the transformed text
# should be identical.  Note: that we ignore the Unix-From since that may
# contain a changed date. 

def test__all__(self):
        module = __import__('email')
        # Can't use sorted() here due to Python 2.3 compatibility
        all = module.__all__[:]
        all.sort()
        self.assertEqual(all, [
            # Old names
            'Charset', 'Encoders', 'Errors', 'Generator',
            'Header', 'Iterators', 'MIMEAudio', 'MIMEBase',
            'MIMEImage', 'MIMEMessage', 'MIMEMultipart',
            'MIMENonMultipart', 'MIMEText', 'Message',
            'Parser', 'Utils', 'base64MIME',
            # new names
            'base64mime', 'charset', 'encoders', 'errors', 'generator',
            'header', 'iterators', 'message', 'message_from_file',
            'message_from_string', 'mime', 'parser',
            'quopriMIME', 'quoprimime', 'utils',
            ]) 

def test_as_string(self):
        eq = self.assertEqual
        msg = self._msgobj('msg_01.txt')
        fp = openfile('msg_01.txt')
        try:
            # BAW 30-Mar-2009 Evil be here.  So, the generator is broken with
            # respect to long line breaking.  It's also not idempotent when a
            # header from a parsed message is continued with tabs rather than
            # spaces.  Before we fixed bug 1974 it was reversedly broken,
            # i.e. headers that were continued with spaces got continued with
            # tabs.  For Python 2.x there's really no good fix and in Python
            # 3.x all this stuff is re-written to be right(er).  Chris Withers
            # convinced me that using space as the default continuation
            # character is less bad for more applications.
            text = fp.read().replace('\t', ' ')
        finally:
            fp.close()
        self.ndiffAssertEqual(text, msg.as_string())
        fullrepr = str(msg)
        lines = fullrepr.split('\n')
        self.assertTrue(lines[0].startswith('From '))
        eq(text, NL.join(lines[1:])) 

def test_mime_attachments_in_constructor(self):
        eq = self.assertEqual
        text1 = MIMEText('')
        text2 = MIMEText('')
        msg = MIMEMultipart(_subparts=(text1, text2))
        eq(len(msg.get_payload()), 2)
        eq(msg.get_payload(0), text1)
        eq(msg.get_payload(1), text2)



# A general test of parser->model->generator idempotency.  IOW, read a message
# in, parse it into a message object tree, then without touching the tree,
# regenerate the plain text.  The original text and the transformed text
# should be identical.  Note: that we ignore the Unix-From since that may
# contain a changed date. 

def test_as_string(self):
        eq = self.assertEqual
        msg = self._msgobj('msg_01.txt')
        fp = openfile('msg_01.txt')
        try:
            # BAW 30-Mar-2009 Evil be here.  So, the generator is broken with
            # respect to long line breaking.  It's also not idempotent when a
            # header from a parsed message is continued with tabs rather than
            # spaces.  Before we fixed bug 1974 it was reversedly broken,
            # i.e. headers that were continued with spaces got continued with
            # tabs.  For Python 2.x there's really no good fix and in Python
            # 3.x all this stuff is re-written to be right(er).  Chris Withers
            # convinced me that using space as the default continuation
            # character is less bad for more applications.
            text = fp.read().replace('\t', ' ')
        finally:
            fp.close()
        self.ndiffAssertEqual(text, msg.as_string())
        fullrepr = str(msg)
        lines = fullrepr.split('\n')
        self.assertTrue(lines[0].startswith('From '))
        eq(text, NL.join(lines[1:])) 

def test_mime_attachments_in_constructor(self):
        eq = self.assertEqual
        text1 = MIMEText('')
        text2 = MIMEText('')
        msg = MIMEMultipart(_subparts=(text1, text2))
        eq(len(msg.get_payload()), 2)
        eq(msg.get_payload(0), text1)
        eq(msg.get_payload(1), text2)



# A general test of parser->model->generator idempotency.  IOW, read a message
# in, parse it into a message object tree, then without touching the tree,
# regenerate the plain text.  The original text and the transformed text
# should be identical.  Note: that we ignore the Unix-From since that may
# contain a changed date. 

def test__all__(self):
        module = __import__('email')
        # Can't use sorted() here due to Python 2.3 compatibility
        all = module.__all__[:]
        all.sort()
        self.assertEqual(all, [
            # Old names
            'Charset', 'Encoders', 'Errors', 'Generator',
            'Header', 'Iterators', 'MIMEAudio', 'MIMEBase',
            'MIMEImage', 'MIMEMessage', 'MIMEMultipart',
            'MIMENonMultipart', 'MIMEText', 'Message',
            'Parser', 'Utils', 'base64MIME',
            # new names
            'base64mime', 'charset', 'encoders', 'errors', 'generator',
            'header', 'iterators', 'message', 'message_from_file',
            'message_from_string', 'mime', 'parser',
            'quopriMIME', 'quoprimime', 'utils',
            ]) 

def test_mime_attachments_in_constructor(self):
        eq = self.assertEqual
        text1 = MIMEText('')
        text2 = MIMEText('')
        msg = MIMEMultipart(_subparts=(text1, text2))
        eq(len(msg.get_payload()), 2)
        eq(msg.get_payload(0), text1)
        eq(msg.get_payload(1), text2)



# A general test of parser->model->generator idempotency.  IOW, read a message
# in, parse it into a message object tree, then without touching the tree,
# regenerate the plain text.  The original text and the transformed text
# should be identical.  Note: that we ignore the Unix-From since that may
# contain a changed date. 

def test_mime_attachments_in_constructor(self):
        eq = self.assertEqual
        text1 = MIMEText('')
        text2 = MIMEText('')
        msg = MIMEMultipart(_subparts=(text1, text2))
        eq(len(msg.get_payload()), 2)
        eq(msg.get_payload(0), text1)
        eq(msg.get_payload(1), text2)



# A general test of parser->model->generator idempotency.  IOW, read a message
# in, parse it into a message object tree, then without touching the tree,
# regenerate the plain text.  The original text and the transformed text
# should be identical.  Note: that we ignore the Unix-From since that may
# contain a changed date. 

def test__all__(self):
        module = __import__('email')
        # Can't use sorted() here due to Python 2.3 compatibility
        all = module.__all__[:]
        all.sort()
        self.assertEqual(all, [
            # Old names
            'Charset', 'Encoders', 'Errors', 'Generator',
            'Header', 'Iterators', 'MIMEAudio', 'MIMEBase',
            'MIMEImage', 'MIMEMessage', 'MIMEMultipart',
            'MIMENonMultipart', 'MIMEText', 'Message',
            'Parser', 'Utils', 'base64MIME',
            # new names
            'base64mime', 'charset', 'encoders', 'errors', 'generator',
            'header', 'iterators', 'message', 'message_from_file',
            'message_from_string', 'mime', 'parser',
            'quopriMIME', 'quoprimime', 'utils',
            ]) 

def test_as_string(self):
        eq = self.assertEqual
        msg = self._msgobj('msg_01.txt')
        fp = openfile('msg_01.txt')
        try:
            # BAW 30-Mar-2009 Evil be here.  So, the generator is broken with
            # respect to long line breaking.  It's also not idempotent when a
            # header from a parsed message is continued with tabs rather than
            # spaces.  Before we fixed bug 1974 it was reversedly broken,
            # i.e. headers that were continued with spaces got continued with
            # tabs.  For Python 2.x there's really no good fix and in Python
            # 3.x all this stuff is re-written to be right(er).  Chris Withers
            # convinced me that using space as the default continuation
            # character is less bad for more applications.
            text = fp.read().replace('\t', ' ')
        finally:
            fp.close()
        self.ndiffAssertEqual(text, msg.as_string())
        fullrepr = str(msg)
        lines = fullrepr.split('\n')
        self.assertTrue(lines[0].startswith('From '))
        eq(text, NL.join(lines[1:])) 

def test_mime_attachments_in_constructor(self):
        eq = self.assertEqual
        text1 = MIMEText('')
        text2 = MIMEText('')
        msg = MIMEMultipart(_subparts=(text1, text2))
        eq(len(msg.get_payload()), 2)
        eq(msg.get_payload(0), text1)
        eq(msg.get_payload(1), text2)



# A general test of parser->model->generator idempotency.  IOW, read a message
# in, parse it into a message object tree, then without touching the tree,
# regenerate the plain text.  The original text and the transformed text
# should be identical.  Note: that we ignore the Unix-From since that may
# contain a changed date. 

def test__all__(self):
        module = __import__('email')
        # Can't use sorted() here due to Python 2.3 compatibility
        all = module.__all__[:]
        all.sort()
        self.assertEqual(all, [
            # Old names
            'Charset', 'Encoders', 'Errors', 'Generator',
            'Header', 'Iterators', 'MIMEAudio', 'MIMEBase',
            'MIMEImage', 'MIMEMessage', 'MIMEMultipart',
            'MIMENonMultipart', 'MIMEText', 'Message',
            'Parser', 'Utils', 'base64MIME',
            # new names
            'base64mime', 'charset', 'encoders', 'errors', 'generator',
            'header', 'iterators', 'message', 'message_from_file',
            'message_from_string', 'mime', 'parser',
            'quopriMIME', 'quoprimime', 'utils',
            ]) 

def test_as_string(self):
        eq = self.assertEqual
        msg = self._msgobj('msg_01.txt')
        fp = openfile('msg_01.txt')
        try:
            # BAW 30-Mar-2009 Evil be here.  So, the generator is broken with
            # respect to long line breaking.  It's also not idempotent when a
            # header from a parsed message is continued with tabs rather than
            # spaces.  Before we fixed bug 1974 it was reversedly broken,
            # i.e. headers that were continued with spaces got continued with
            # tabs.  For Python 2.x there's really no good fix and in Python
            # 3.x all this stuff is re-written to be right(er).  Chris Withers
            # convinced me that using space as the default continuation
            # character is less bad for more applications.
            text = fp.read().replace('\t', ' ')
        finally:
            fp.close()
        self.ndiffAssertEqual(text, msg.as_string())
        fullrepr = str(msg)
        lines = fullrepr.split('\n')
        self.assertTrue(lines[0].startswith('From '))
        eq(text, NL.join(lines[1:])) 

def test_mime_attachments_in_constructor(self):
        eq = self.assertEqual
        text1 = MIMEText('')
        text2 = MIMEText('')
        msg = MIMEMultipart(_subparts=(text1, text2))
        eq(len(msg.get_payload()), 2)
        eq(msg.get_payload(0), text1)
        eq(msg.get_payload(1), text2)



# A general test of parser->model->generator idempotency.  IOW, read a message
# in, parse it into a message object tree, then without touching the tree,
# regenerate the plain text.  The original text and the transformed text
# should be identical.  Note: that we ignore the Unix-From since that may
# contain a changed date. 

def test__all__(self):
        module = __import__('email')
        # Can't use sorted() here due to Python 2.3 compatibility
        all = module.__all__[:]
        all.sort()
        self.assertEqual(all, [
            # Old names
            'Charset', 'Encoders', 'Errors', 'Generator',
            'Header', 'Iterators', 'MIMEAudio', 'MIMEBase',
            'MIMEImage', 'MIMEMessage', 'MIMEMultipart',
            'MIMENonMultipart', 'MIMEText', 'Message',
            'Parser', 'Utils', 'base64MIME',
            # new names
            'base64mime', 'charset', 'encoders', 'errors', 'generator',
            'header', 'iterators', 'message', 'message_from_file',
            'message_from_string', 'mime', 'parser',
            'quopriMIME', 'quoprimime', 'utils',
            ]) 

def test_as_string(self):
        eq = self.assertEqual
        msg = self._msgobj('msg_01.txt')
        fp = openfile('msg_01.txt')
        try:
            # BAW 30-Mar-2009 Evil be here.  So, the generator is broken with
            # respect to long line breaking.  It's also not idempotent when a
            # header from a parsed message is continued with tabs rather than
            # spaces.  Before we fixed bug 1974 it was reversedly broken,
            # i.e. headers that were continued with spaces got continued with
            # tabs.  For Python 2.x there's really no good fix and in Python
            # 3.x all this stuff is re-written to be right(er).  Chris Withers
            # convinced me that using space as the default continuation
            # character is less bad for more applications.
            text = fp.read().replace('\t', ' ')
        finally:
            fp.close()
        self.ndiffAssertEqual(text, msg.as_string())
        fullrepr = str(msg)
        lines = fullrepr.split('\n')
        self.assertTrue(lines[0].startswith('From '))
        eq(text, NL.join(lines[1:])) 

def _dump_message(self, message, target, mangle_from_=False):
        # Most files are opened in binary mode to allow predictable seeking.
        # To get native line endings on disk, the user-friendly \n line endings
        # used in strings and by email.Message are translated here.
        """Dump message contents to target file."""
        if isinstance(message, email.message.Message):
            buffer = StringIO.StringIO()
            gen = email.generator.Generator(buffer, mangle_from_, 0)
            gen.flatten(message)
            buffer.seek(0)
            data = buffer.read().replace('\n', os.linesep)
            target.write(data)
            if self._append_newline and not data.endswith(os.linesep):
                # Make sure the message ends with a newline
                target.write(os.linesep)
        elif isinstance(message, str):
            if mangle_from_:
                message = message.replace('\nFrom ', '\n>From ')
            message = message.replace('\n', os.linesep)
            target.write(message)
            if self._append_newline and not message.endswith(os.linesep):
                # Make sure the message ends with a newline
                target.write(os.linesep)
        elif hasattr(message, 'read'):
            lastline = None
            while True:
                line = message.readline()
                if line == '':
                    break
                if mangle_from_ and line.startswith('From '):
                    line = '>From ' + line[5:]
                line = line.replace('\n', os.linesep)
                target.write(line)
                lastline = line
            if self._append_newline and lastline and not lastline.endswith(os.linesep):
                # Make sure the message ends with a newline
                target.write(os.linesep)
        else:
            raise TypeError('Invalid message type: %s' % type(message)) 

def _dump_message(self, message, target, mangle_from_=False):
        # Most files are opened in binary mode to allow predictable seeking.
        # To get native line endings on disk, the user-friendly \n line endings
        # used in strings and by email.Message are translated here.
        """Dump message contents to target file."""
        if isinstance(message, email.message.Message):
            buffer = StringIO.StringIO()
            gen = email.generator.Generator(buffer, mangle_from_, 0)
            gen.flatten(message)
            buffer.seek(0)
            data = buffer.read().replace('\n', os.linesep)
            target.write(data)
            if self._append_newline and not data.endswith(os.linesep):
                # Make sure the message ends with a newline
                target.write(os.linesep)
        elif isinstance(message, str):
            if mangle_from_:
                message = message.replace('\nFrom ', '\n>From ')
            message = message.replace('\n', os.linesep)
            target.write(message)
            if self._append_newline and not message.endswith(os.linesep):
                # Make sure the message ends with a newline
                target.write(os.linesep)
        elif hasattr(message, 'read'):
            lastline = None
            while True:
                line = message.readline()
                if line == '':
                    break
                if mangle_from_ and line.startswith('From '):
                    line = '>From ' + line[5:]
                line = line.replace('\n', os.linesep)
                target.write(line)
                lastline = line
            if self._append_newline and lastline and not lastline.endswith(os.linesep):
                # Make sure the message ends with a newline
                target.write(os.linesep)
        else:
            raise TypeError('Invalid message type: %s' % type(message)) 

def _dump_message(self, message, target, mangle_from_=False):
        # Most files are opened in binary mode to allow predictable seeking.
        # To get native line endings on disk, the user-friendly \n line endings
        # used in strings and by email.Message are translated here.
        """Dump message contents to target file."""
        if isinstance(message, email.message.Message):
            buffer = StringIO.StringIO()
            gen = email.generator.Generator(buffer, mangle_from_, 0)
            gen.flatten(message)
            buffer.seek(0)
            target.write(buffer.read().replace('\n', os.linesep))
        elif isinstance(message, str):
            if mangle_from_:
                message = message.replace('\nFrom ', '\n>From ')
            message = message.replace('\n', os.linesep)
            target.write(message)
        elif hasattr(message, 'read'):
            while True:
                line = message.readline()
                if line == '':
                    break
                if mangle_from_ and line.startswith('From '):
                    line = '>From ' + line[5:]
                line = line.replace('\n', os.linesep)
                target.write(line)
        else:
            raise TypeError('Invalid message type: %s' % type(message)) 

def _dump_message(self, message, target, mangle_from_=False):
        # Most files are opened in binary mode to allow predictable seeking.
        # To get native line endings on disk, the user-friendly \n line endings
        # used in strings and by email.Message are translated here.
        """Dump message contents to target file."""
        if isinstance(message, email.message.Message):
            buffer = StringIO.StringIO()
            gen = email.generator.Generator(buffer, mangle_from_, 0)
            gen.flatten(message)
            buffer.seek(0)
            data = buffer.read().replace('\n', os.linesep)
            target.write(data)
            if self._append_newline and not data.endswith(os.linesep):
                # Make sure the message ends with a newline
                target.write(os.linesep)
        elif isinstance(message, str):
            if mangle_from_:
                message = message.replace('\nFrom ', '\n>From ')
            message = message.replace('\n', os.linesep)
            target.write(message)
            if self._append_newline and not message.endswith(os.linesep):
                # Make sure the message ends with a newline
                target.write(os.linesep)
        elif hasattr(message, 'read'):
            lastline = None
            while True:
                line = message.readline()
                if line == '':
                    break
                if mangle_from_ and line.startswith('From '):
                    line = '>From ' + line[5:]
                line = line.replace('\n', os.linesep)
                target.write(line)
                lastline = line
            if self._append_newline and lastline and not lastline.endswith(os.linesep):
                # Make sure the message ends with a newline
                target.write(os.linesep)
        else:
            raise TypeError('Invalid message type: %s' % type(message)) 

def _dump_message(self, message, target, mangle_from_=False):
        # Most files are opened in binary mode to allow predictable seeking.
        # To get native line endings on disk, the user-friendly \n line endings
        # used in strings and by email.Message are translated here.
        """Dump message contents to target file."""
        if isinstance(message, email.message.Message):
            buffer = StringIO.StringIO()
            gen = email.generator.Generator(buffer, mangle_from_, 0)
            gen.flatten(message)
            buffer.seek(0)
            data = buffer.read().replace('\n', os.linesep)
            target.write(data)
            if self._append_newline and not data.endswith(os.linesep):
                # Make sure the message ends with a newline
                target.write(os.linesep)
        elif isinstance(message, str):
            if mangle_from_:
                message = message.replace('\nFrom ', '\n>From ')
            message = message.replace('\n', os.linesep)
            target.write(message)
            if self._append_newline and not message.endswith(os.linesep):
                # Make sure the message ends with a newline
                target.write(os.linesep)
        elif hasattr(message, 'read'):
            lastline = None
            while True:
                line = message.readline()
                if line == '':
                    break
                if mangle_from_ and line.startswith('From '):
                    line = '>From ' + line[5:]
                line = line.replace('\n', os.linesep)
                target.write(line)
                lastline = line
            if self._append_newline and lastline and not lastline.endswith(os.linesep):
                # Make sure the message ends with a newline
                target.write(os.linesep)
        else:
            raise TypeError('Invalid message type: %s' % type(message)) 

def _dump_message(self, message, target, mangle_from_=False):
        # Most files are opened in binary mode to allow predictable seeking.
        # To get native line endings on disk, the user-friendly \n line endings
        # used in strings and by email.Message are translated here.
        """Dump message contents to target file."""
        if isinstance(message, email.message.Message):
            buffer = StringIO.StringIO()
            gen = email.generator.Generator(buffer, mangle_from_, 0)
            gen.flatten(message)
            buffer.seek(0)
            data = buffer.read().replace('\n', os.linesep)
            target.write(data)
            if self._append_newline and not data.endswith(os.linesep):
                # Make sure the message ends with a newline
                target.write(os.linesep)
        elif isinstance(message, str):
            if mangle_from_:
                message = message.replace('\nFrom ', '\n>From ')
            message = message.replace('\n', os.linesep)
            target.write(message)
            if self._append_newline and not message.endswith(os.linesep):
                # Make sure the message ends with a newline
                target.write(os.linesep)
        elif hasattr(message, 'read'):
            lastline = None
            while True:
                line = message.readline()
                if line == '':
                    break
                if mangle_from_ and line.startswith('From '):
                    line = '>From ' + line[5:]
                line = line.replace('\n', os.linesep)
                target.write(line)
                lastline = line
            if self._append_newline and lastline and not lastline.endswith(os.linesep):
                # Make sure the message ends with a newline
                target.write(os.linesep)
        else:
            raise TypeError('Invalid message type: %s' % type(message))