closure.py 文件源码

def is_probably_safe(x):
    '''
    Objects are probably "safe" (unlikly to change) if they are
    -- immutable
    -- functions
    -- modules
    Obviously, the latter two may change, but in practice it is likely
    ok. Still, risky!
    '''
    if is_immutable(x): return True
    if sys.version_info > (3,):
        probably_fine = (\
            types.LambdaType,
            types.BuiltinMethodType,
            types.BuiltinFunctionType,
            types.FunctionType,
            types.ModuleType,
            types.MethodType)
    else:
        probably_fine = (\
            types.LambdaType,
            types.InstanceType,
            types.NoneType,
            types.NotImplementedType,
            types.TypeType,
            types.UnicodeType,
            types.ComplexType,
            types.ClassType,
            types.BuiltinMethodType,
            types.BuiltinFunctionType,
            types.FunctionType,
            types.ModuleType,
            types.MethodType)

    if type(x) in probably_fine: return True
    if hasattr(x,'__call__'): return True
    return False