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by Jaisen
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elodie/compatability.py (3 issues)

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import os
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import shutil
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import sys
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from elodie import constants
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def _decode(string, encoding=sys.getfilesystemencoding()):
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    """Return a utf8 encoded unicode string.
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    Python2 and Python3 differ in how they handle strings.
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    So we do a few checks to see if the string is ascii or unicode.
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    Then we decode it if needed.
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    """
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    if hasattr(string, 'decode'):
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        # If the string is already unicode we return it.
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        try:
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            if isinstance(string, unicode):
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Comprehensibility Best Practice introduced by Jaisen Mathai
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                return string
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        except NameError:
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            pass
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        return string.decode(encoding)
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    return string
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def _bytes(string):
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    if constants.python_version == 3:
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        return bytes(string, 'utf8')
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    else:
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        return bytes(string)
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def _copyfile(src, dst):
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    # shutil.copy seems slow, changing to streaming according to
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    # http://stackoverflow.com/questions/22078621/python-how-to-copy-files-fast  # noqa
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    # Python 3 hangs using open/write method so we proceed with shutil.copy
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    #  and only perform the optimized write for Python 2.
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    if (constants.python_version == 3):
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        # Do not use copy2(), it will have an issue when copying to a
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        #  network/mounted drive.
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        # Using copy and manual set_date_from_filename gets the job done.
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        # The calling function is responsible for setting the time.
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        shutil.copy(src, dst)
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        return
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    try:
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        O_BINARY = os.O_BINARY
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    except:
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        O_BINARY = 0
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    READ_FLAGS = os.O_RDONLY | O_BINARY
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    WRITE_FLAGS = os.O_WRONLY | os.O_CREAT | os.O_TRUNC | O_BINARY
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    TEN_MEGABYTES = 10485760
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    BUFFER_SIZE = min(TEN_MEGABYTES, os.path.getsize(src))
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    try:
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        fin = os.open(src, READ_FLAGS)
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        stat = os.fstat(fin)
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        fout = os.open(dst, WRITE_FLAGS, stat.st_mode)
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        for x in iter(lambda: os.read(fin, BUFFER_SIZE), ""):
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The variable fin does not seem to be defined for all execution paths.
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            os.write(fout, x)
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    finally:
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        try:
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            os.close(fin)
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        except:
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            pass
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        try:
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            os.close(fout)
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        except:
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            pass
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# If you want cross-platform overwriting of the destination, 
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# use os.replace() instead of rename().
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# https://docs.python.org/3/library/os.html#os.rename
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def _rename(src, dst):
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    if (constants.python_version == 3):
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        return os.replace(src, dst)
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    else:
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        return os.rename(src, dst)
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