import time
from functools import wraps

# 1. 定义修饰器
def ctimer(function):
    @wraps(function)
    def ftimer(*args, **kwargs):
        t0 = time.time()
        result = function(*args, **kwargs)
        t1 = time.time()
        sys.stderr.write("[INFO] '%s' running cost: %s seconds\n" %(function.func_name, str(t1-t0)))
        return result
    return ftimer
# 2. 加载修饰器
@ ctimer
def targetfunc():
    a = np.arange(1000000)
    return 1000000
# 3. 测试函数耗时
targetfunc()