python with..as.. __call__ __enter__ __exit__

with .. as ..

# coding=utf8
__author__ = 'Administrator'
import inspect

class Test(object):
"""
测试__call__, __exit__, __enter__

作用：
1.简化代码
2.释放资源
3易于阅读
"""

def __init__(self, name):
self.name = name

def __enter__(self):  # 在with后面的表达式取值后的对象中调用
print "func:{}".format(inspect.stack()[0][3])

def __exit__(self, exc_type, exc_val, exc_tb):  # 结束后调用
frame_stack = inspect.stack()
print "func:{}".format(frame_stack[0][3])  # 返回函数名
print "func:{}".format(inspect.getframeinfo(frame_stack[0][0]))  # 返回追踪信息
self.test()

def test(self):
print "func:{}".format(inspect.stack()[0][3])

if __name__ == "__main__":

with Test("ha") as test:
print "123"

func:__enter__
123
func:__exit__
func:Traceback(filename='E:/Project/Actneed4/furion/test/test_built_in.py', lineno=21, function='__exit__', code_context=['        print "func:{}".format(inspect.getframeinfo(frame_stack[0][0]))\n'], index=0)
func:test

__call__

class_obj(arg1, arg2)

getattr("obj", "name", default=None)

obj.__getattribute__("func_name")