Python 强化训练：第八篇

pip freeze > requirements.txt # 以.txt文件将项目需要的库进行整理
pip install -r requirements.txt  # 安装项目需要的库

virtualenv filename  # 创建虚拟环境文件夹
cd filename  
Script\activate    # 激活虚拟环境

deactivate     

def apply_async(func, args, *, callback):    # *后是关键字参数
    result = func(*args)
    callback(result)


def print_result(result):
    print("result:  {0}".format(result))


def add(x, y):
    return x + y


apply_async(add, (2, 3), callback=print_result)


def double(x):
    return 2*x


def quaderuple(x):
    return 4*x


def getOddnumber(k, *, callback, lastback):
    return 1 + callback(k) + lastback(k)


def main():
    k = 1
    i = getOddnumber(k, callback=double, lastback=quaderuple)
    print(i)
    j = getOddnumber(k, callback=quaderuple, lastback=double)
    print(j)
    l = getOddnumber(k, callback=lambda x: x*8, lastback=double)
    print(l)

main()

def func(a=1, b="name",c=[]):
    """func name"""
    return (a, b)

print(func.__name__)
print(func.__doc__)
print(func.__module__)
print(func.__defaults__)
func.__defaults__[2].append(22)
print(func.__defaults__)
print(func.__dict__)


def func_one(a: int, b: int) -> int:
    """func_one name"""
    c = 2
    return lambda k: pow(a+b+c, k)
    pass

print(func_one.__name__)
print(func_one.__module__)
print(func_one.__doc__)
print(func_one.__defaults__)
print(func_one.__dict__)
print(func_one.__closure__)
print(func_one.__annotations__)

from functools import update_wrapper, wraps, WRAPPER_ASSIGNMENTS, WRAPPER_UPDATES

def func_name(func):
    @wraps(func)
    def wrapper(*args, **kwargs):
        """warpper doc"""
        print("wrapper function")
        func(*args, **kwargs)
    #update_wrapper(wrapper, func)
    return wrapper

@func_name
def example():
    """example doc"""
    print("example function")