utils.py 文件源码

def re_fullmatch(regex, string, flags=0):
    """Emulate python-3.4 re.fullmatch()."""
    return re.match("(?:" + regex + r")\Z", string, flags=flags)


# The issue this function tries to solve is to have a text writer where unicode
# data can be written without decoding error. It should work in the following
# conditions:
# - python 2 & 3, output to terminal
# - python 2 & 3, output to a pipe or shell redirection
# - python 2 & 3, output to a StringIO
#
# When using python 2, if the program output is redirected to a pipe or file,
# the output encoding may be set to 'ascii',
# potentially producing UnicodeEncodeError.
# Redirections do not seem to cause such issue with python 3
# but explicit utf-8 encoding seems a sensible choice to output data to be
# consumed by other programs (e.g: JSON).