rewrite.py 文件源码

def _write_pyc(state, co, source_stat, pyc):
    # Technically, we don't have to have the same pyc format as
    # (C)Python, since these "pycs" should never be seen by builtin
    # import. However, there's little reason deviate, and I hope
    # sometime to be able to use imp.load_compiled to load them. (See
    # the comment in load_module above.)
    try:
        fp = open(pyc, "wb")
    except IOError:
        err = sys.exc_info()[1].errno
        state.trace("error writing pyc file at %s: errno=%s" %(pyc, err))
        # we ignore any failure to write the cache file
        # there are many reasons, permission-denied, __pycache__ being a
        # file etc.
        return False
    try:
        fp.write(imp.get_magic())
        mtime = int(source_stat.mtime)
        size = source_stat.size & 0xFFFFFFFF
        fp.write(struct.pack("<ll", mtime, size))
        marshal.dump(co, fp)
    finally:
        fp.close()
    return True