开发笔记:alexpythonofday2

1 import sys
2 print(sys.path) #打印环境变量
3 print(sys.argv) #打印相对路径

1 # author:"Jason lincoln"
2 import os
3 #cmd_res=os.system("dir") #只执行命令,不保存结果
4 cmd_res = os.popen("dir").read()
5 print("-->",cmd_res)
6 os.mkdir("new_dir") #创建一个目录

x=0101,y=1011
x^y==1110

a=0011 0011 #十进制等于51
a==a<<2
a==1100 1100 #十进制等于204

1 # author:"Jason lincoln"
2
3 a,b,c=1,3,5
4 d=a if a>b else c
5 print(d)

1 #print(names[1:3]) #顾头不顾尾 从第一个开始取到第三个不包括第三个
2 #print(names[3])
3 print(names[-2:]) #从左往右数
4 ##[‘Xuliangchen‘, ‘xiangpeng‘]
5 print(names[0:3])
6 ##[‘Zhangyang‘, ‘GuYun‘, ‘Xuliangchen‘]
7 print(names[:3])
8 ##[‘Zhangyang‘, ‘GuYun‘, ‘Xuliangchen‘]
9 names.append("Leihaidong")
10 print(names)
11 ##[‘Zhangyang‘, ‘GuYun‘, ‘Xuliangchen‘, ‘xiangpeng‘, ‘Leihaidong‘]
12 names.insert(1,"chenronghua")
13 print(names)
14 ##[‘Zhangyang‘, ‘chenronghua‘, ‘GuYun‘, ‘Xuliangchen‘, ‘xiangpeng‘, ‘Leihaidong‘]

1 ames.remove("chenronghua")
2 del names[1]
3 names.pop() #如果不输入默认删除最后一个
4 names.pop(1) #和del names[1]效果一样

1 print(names)
2 print(names.index("GuYun"))
3 print(names[names.index("GuYun")])

1 print(names.count("chenronghua"))

names.clear()

names.reverse()

names.sort

names.extend()

1 names=["Zhangyang","GuYun",["alex","jack"],"xiangpeng","Xuliangchen"]
2 name2=names.copy()
3 print(names)
4 print(name2)
5 names[3]="向鹏"
6 names[2][0]="ALEX" #浅copy,只copy内存地址，同一块内存
7 print(names)
8 print(name2)

1 # author:"Jason lincoln"
2 import copy
3 names=["Zhangyang","GuYun",["alex","jack"],"xiangpeng","Xuliangchen"]
4 #name2=copy.copy(names) #和浅copy一样
5 name2=copy.deepcopy(names) #深copy
6 print(names)
7 print(name2)
8 names[3]="向鹏"
9 names[2][0]="ALEX" #浅copy,只copy内存地址
10 print(names)
11 print(name2)

1 names=(‘jack‘,‘alex‘)2 names.index
3 names.count