函数练习题

import os


def modify(filename, old, new):
    old_file = filename
    new_file = filename * 2
    f = open(old_file, ‘r‘, encoding=‘utf-8‘)
    fnew = open(new_file, ‘w‘, encoding=‘utf-8‘)

    for line in f:
        newline = line.replace(old, new)
        fnew.write(newline)
    f.close()
    fnew.close()
    os.replace(new_file, old_file)


modify(‘data.txt‘, ‘170‘, ‘175‘)

def cards():
    num = [i for i in range(2,11)]
    num.extend([‘J‘,‘Q‘,‘K‘,‘A‘])
    type = [‘红心‘,‘草花‘,‘方块‘,‘黑桃‘]
    result = []
    for i in num:
        for j in type:
            result.append((j,i))
    return result
print(cards())

import math
print(‘‘‘
请按照如下格式输出：
    调用函数area(‘圆形’,圆半径) 返回圆的面积
    调用函数area(‘正方形’,边长) 返回正方形的面积
    调用函数area(‘长方形’,长，宽) 返回长方形的面积‘‘‘)
def area(name,*args):
    def areas_rectangle(x,y):
        return ("长方形的面积为：",x*y)
 
    def area_square(x):
        return ("正方形的面积为：",x**2)
 
    def area_round(r):
        return ("圆形的面积为：",math.pi*r*r)
    if name ==‘圆形‘:
        return area_round(*args)
    elif name ==‘正方形‘:
        return area_square(*args)
    elif name ==‘长方形‘:
        return areas_rectangle(*args)
 
 
print(area(‘长方形‘, 3, 4))
print(area(‘圆形‘, 3))
print(area(‘正方形‘, 3))
# 请按照如下格式输出：
#     调用函数area(‘圆形’,圆半径) 返回圆的面积
#     调用函数area(‘正方形’,边长) 返回正方形的面积
#     调用函数area(‘长方形’,长，宽) 返回长方形的面积
# (‘长方形的面积为：‘, 12)
# (‘圆形的面积为：‘, 28.274333882308138)
# (‘正方形的面积为：‘, 9)

FLAG = False    #加一个变量防止多次登录验证
def wrapper(fun):
    def inner(*args,**kwargs):
        ‘‘‘登录程序‘‘‘
        global FLAG #将FLAG变量设置成全局变量
        if FLAG:
            ret = fun(*args, **kwargs)
            return ret
        else:
            username = input(‘username:‘)
            password = input(‘password:‘)
            if username == ‘123‘ and password == ‘345‘:
                FLAG = True
                ret = fun(*args,**kwargs)
                return ret
            else:
                print(‘登录失败‘)
    return inner

@wrapper
def func_1():
    print(‘func1 is running!‘)

@wrapper
def func_2():
    print(‘func2 is running!‘)

func_1()
func_2()

import time
def logger(filename,channel=‘file‘):
    count = 0
    def print_file():
        with open(filename,"a",encoding="utf-8") as f:
            f.write(s)
    def print_terminal():
        print(s,end="")
    def print_both():
        with open(filename,"a",encoding="utf-8") as f:
            f.write(s)
        print(s,end="")
    func_dic = {
         ‘file‘:print_file,
         ‘terminal‘:print_terminal,
         ‘both‘:print_both,
    }
    print_func = func_dic[channel]
    while True:
        msg = yield
        s = "%s [%d] %s\n"%(time.strftime("%Y-%m-%d %H:%M:%S"),count,msg)
        print_func()
        count += 1
log_obj = logger(filename="web.log",channel=‘both‘)
log_obj.__next__()
log_obj.send(‘user xiao login success‘)
log_obj.send(‘user qing login success‘)