(option, opt, value, parser)
Process a value provided for the --no-use-pep517 option.

    This is an optparse.Option callback for the no_use_pep517 option.
Process a value provided for the --no-use-pep517 option.
Process a value provided for the -- no - use - pep517 option .
def _handle_no_use_pep517(option, opt, value, parser):
    # type: (Option, str, str, OptionParser) -> None
    """
    Process a value provided for the --no-use-pep517 option.

    This is an optparse.Option callback for the no_use_pep517 option.
    """
    # Since --no-use-pep517 doesn't accept arguments, the value argument
    # will be None if --no-use-pep517 is passed via the command-line.
    # However, the value can be non-None if the option is triggered e.g.
    # by an environment variable, for example "PIP_NO_USE_PEP517=true".
    if value is not None:
        msg = """A value was passed for --no-use-pep517,
        probably using either the PIP_NO_USE_PEP517 environment variable
        or the "no-use-pep517" config file option. Use an appropriate value
        of the PIP_USE_PEP517 environment variable or the "use-pep517"
        config file option instead.
        """
        raise_option_error(parser, option=option, msg=msg)

    # Otherwise, --no-use-pep517 was passed via the command-line.
    parser.values.use_pep517 = False
def _handle_no_use_pep517 ( option , opt , value , parser ) : # type: (Option, str, str, OptionParser) -> None # Since --no-use-pep517 doesn't accept arguments, the value argument # will be None if --no-use-pep517 is passed via the command-line. # However, the value can be non-None if the option is triggered e.g. # by an environment variable, for example "PIP_NO_USE_PEP517=true". if value is not None : msg = """A value was passed for --no-use-pep517,
        probably using either the PIP_NO_USE_PEP517 environment variable
        or the "no-use-pep517" config file option. Use an appropriate value
        of the PIP_USE_PEP517 environment variable or the "use-pep517"
        config file option instead.
        """ raise_option_error ( parser , option = option , msg = msg ) # Otherwise, --no-use-pep517 was passed via the command-line. parser . values . use_pep517 = False