08 Jun 2016
Docstring: isinstance(object, class-or-type-or-tuple) -> bool Return whether an object is an instance of a class or of a subclass thereof. With a type as second argument, return whether that is the object's type. The form using a tuple, isinstance(x, (A, B, ...)), is a shortcut for isinstance(x, A) or isinstance(x, B) or ... (etc.). Type: builtin_function_or_method
>>> a = {1:1} >>> isinstance(a, dict) True >>> isinstance(a, str) False
>>> a = {1,1} >>> type(a) set >>> type(a) is set True >>> type(a) == set True # 对比速度 >>> timeit type(a) is set The slowest run took 24.82 times longer than the fastest. This could mean that an intermediate result is being cached. 10000000 loops, best of 3: 76.9 ns per loop timeit type(a) == set The slowest run took 24.83 times longer than the fastest. This could mean that an intermediate result is being cached. 10000000 loops, best of 3: 86.4 ns per loop >>> timeit isinstance(a, set) 10000000 loops, best of 3: 73.5 ns per loop # 显然isinstance速度更快，耗时更平均