environment/lib/python2.7/site-packages/IPython/utils/_process_common.py
def arg_split(s, posix=False, strict=True):
    """Split a command line's arguments in a shell-like manner.

    This is a modified version of the standard library's shlex.split()
    function, but with a default of posix=False for splitting, so that quotes
    in inputs are respected.

    if strict=False, then any errors shlex.split would raise will result in the
    unparsed remainder being the last element of the list, rather than raising.
    This is because we sometimes use arg_split to parse things other than
    command-line args.
    """

    # Unfortunately, python's shlex module is buggy with unicode input:
    # http://bugs.python.org/issue1170
    # At least encoding the input when it's unicode seems to help, but there
    # may be more problems lurking.  Apparently this is fixed in python3.
    is_unicode = False
    if (not py3compat.PY3) and isinstance(s, unicode):
        is_unicode = True
        s = s.encode('utf-8')
    lex = shlex.shlex(s, posix=posix)
    lex.whitespace_split = True
    # Extract tokens, ensuring that things like leaving open quotes
    # does not cause this to raise.  This is important, because we
    # sometimes pass Python source through this (e.g. %timeit f(" ")),
    # and it shouldn't raise an exception.
    # It may be a bad idea to parse things that are not command-line args
    # through this function, but we do, so let's be safe about it.
    lex.commenters='' #fix for GH-1269
    tokens = []
    while True:
        try:
            tokens.append(lex.next())
        except StopIteration:
            break
        except ValueError:
            if strict:
                raise
            # couldn't parse, get remaining blob as last token
            tokens.append(lex.token)
            break
    
    if is_unicode:
        # Convert the tokens back to unicode.
        tokens = [x.decode('utf-8') for x in tokens]
    return tokens
def arg_split(s, posix=False, strict=True):
    """Split a command line's arguments in a shell-like manner.

    This is a modified version of the standard library's shlex.split()
    function, but with a default of posix=False for splitting, so that quotes
    in inputs are respected.

    if strict=False, then any errors shlex.split would raise will result in the
    unparsed remainder being the last element of the list, rather than raising.
    This is because we sometimes use arg_split to parse things other than
    command-line args.
    """

    # Unfortunately, python's shlex module is buggy with unicode input:
    # http://bugs.python.org/issue1170
    # At least encoding the input when it's unicode seems to help, but there
    # may be more problems lurking.  Apparently this is fixed in python3.
    is_unicode = False
    if (not py3compat.PY3) and isinstance(s, unicode):
        is_unicode = True
        s = s.encode('utf-8')
    lex = shlex.shlex(s, posix=posix)
    lex.whitespace_split = True
    # Extract tokens, ensuring that things like leaving open quotes
    # does not cause this to raise.  This is important, because we
    # sometimes pass Python source through this (e.g. %timeit f(" ")),
    # and it shouldn't raise an exception.
    # It may be a bad idea to parse things that are not command-line args
    # through this function, but we do, so let's be safe about it.
    lex.commenters='' #fix for GH-1269
    tokens = []
    while True:
        try:
            tokens.append(lex.next())
        except StopIteration:
            break
        except ValueError:
            if strict:
                raise
            # couldn't parse, get remaining blob as last token
            tokens.append(lex.token)
            break
    
    if is_unicode:
        # Convert the tokens back to unicode.
        tokens = [x.decode('utf-8') for x in tokens]
    return tokens
Split a command line's arguments in a shell-like manner.

    This is a modified version of the standard library's shlex.split()
    function, but with a default of posix=False for splitting, so that quotes
    in inputs are respected.

    if strict=False, then any errors shlex.split would raise will result in the
    unparsed remainder being the last element of the list, rather than raising.
    This is because we sometimes use arg_split to parse things other than
    command-line args.