re.py 文件源码

def _compile(pattern, flags):
    # internal: compile pattern
    try:
        #fixme brython
        #return _cache[type(pattern), pattern, flags]
        return _cache["%s:%s:%s" % (type(pattern), pattern, flags)]
    except KeyError:
       pass
    #print(pattern)
    if isinstance(pattern, _pattern_type):
        if flags:
            raise ValueError(
                "Cannot process flags argument with a compiled pattern")
        return pattern
    if not sre_compile.isstring(pattern):
        raise TypeError("first argument must be string or compiled pattern")
    p = sre_compile.compile(pattern, flags)
    #print('_compile', p)
    if len(_cache) >= _MAXCACHE:
        _cache.clear()
    #fix me brython
    #_cache[type(pattern), pattern, flags] = p
    _cache["%s:%s:%s" % (type(pattern), pattern, flags)]= p
    return p