__init__.py 文件源码

def _run_single_command(cmd):
    """Run a single command inside the virtual environment
    """
    builtins = __builtins__

    # this is how the python -c command works
    sys.argv.insert(0, "-c")

    import __main__
    __main__.__dict__.clear()
    __main__.__dict__.update(dict(
        __name__     = "__main__",

        # file is not defined when 'python -c "print(__file__)"' is run
        #__file__     = script_file,

        __builtins__ = builtins
    ))
    globals = __main__.__dict__
    locals = globals

    code = compile(cmd, "<string>", "single")
    exec code in globals, locals