function函数——函数的定义及参数

Posted 2021-03-21 python-beginner

#_*_coding:utf-8_*_
#作者：王佃元
#日期：2019/12/21
#函数function subrouting  procedure
#函数的意义
    # 1.减少代码重复
    # 2.更易扩展
    # 3.保持代码一致性
# def log(log_text):
#     f = open(‘log.txt‘, ‘a‘)
#     f.write(‘2019-10-25 15:30 %s‘,%log_text)
#     f.close()
# print(‘*********function1‘)
# f = open(‘log.txt‘, ‘a‘)
# f.write(‘2019-10-25 15:30 exec function1‘)
# f.close()
#
# print(‘*********function2‘)
# f = open(‘log.txt‘, ‘a‘)
# f.write(‘exec function2‘)
# f.close()
#
# print(‘*********function3‘)
# f = open(‘log.txt‘, ‘a‘)
# f.write(‘exec function3‘)
# f.close()

# 函数的格式：     def function_name():   函数名区分大小写
# def show_shopping():
#     print(‘OK‘)
# print(show_shopping)

# def add(a):
#     print(a)
#     # print(b)
# add(1, 3)

# def print_info(name, age, sex=‘male‘):          # 默认参数，设定好值，且默认参数一定放在其他参数后面
#     print(‘%s:%d:%s‘%(name, age, sex))
# # print_info(‘derywong‘,18)                   #必须参数
# # print_info(age = 39,name = ‘derywong‘)      #关键字参数
# print(‘dery‘, 30)
# print(‘wong‘, 35)
# print(‘aliex‘, 45, ‘female‘)

#不定长参数  *args
# def add(*args):
#     # print(args)
#     sum = 0
#     for i in args:
#         sum += i
#     print(sum)
# add(1, 2, 3, 4)

#不定长参数 **kwargs    不定长参数*args接收无命名参数，必须放在左边 **args接收有命名参数，必须放在右边
def print_info(sex = ‘male‘, *args, **kwargs):
    print(sex)
    print(args)
    for i in kwargs:
        print(‘%s:%s‘%(i,kwargs[i]))
print_info(‘dery‘,1,2,3,name = ‘wong‘)
# print_info(‘nihoa‘, 18, name = ‘dery‘, job = ‘IT‘)

def func(name, age = 22, *args, **kwargs):