python学习笔记

# 导入正则模块
import re
# 正则处理
re.match(r'^\s*//#if ', each)

list = [1, 2, 3]
length = len(list)

list = [1, 2, 3]
if 1 in list:
    print('true')
else:
    print('false')

list = [1, 2, 3]
for each in list:
    print(each)

list = [1, 2, 3]
for index, each in enumerate(list):
    print(index, each)

def test(a:int) -> int
    pass

class Item:
    def __init__(self):
        pass
    def __del__(self):
        pass

import sys
print(sys.argv) # 打印参数列表
printf(len(sys.argv)) # 打印参数个数

if __name__ == '__main__':
    ...