Python随手笔记-day1

day11.写个简单的Hello World程序

print

(

"Hello World!"

)

2.解释器的规范kjjjj
#!/usr/bin/env python# _*_coding:utf-8_*_ python 3.0后的版本不需要指定字符集了
3.变量定义
#格式name = 'Duan'NamePass = 'Duan 123'#变量赋值name = 'Duan'NamePass = name#NamePass的值其实Duan 无论name如何变化 因为是赋值不是继承
4.用户自定义输入
#字符串name = input("pelease is xxxx")#数字name = int(input("pelease is xxxx"))

5.系统模块如：import os,sysTABLE补全模块
#!/usr/bin/env python # python startup file import sysimport readlineimport rlcompleterimport atexitimport os# tab completion readline.parse_and_bind('tab: complete')# history file histfile = os.path.join(os.environ['HOME'], '.pythonhistory')try: readline.read_history_file(histfile)except IOError: passatexit.register(readline.write_history_file, histfile)del os, histfile, readline, rlcompleter6.数据类型字符串是 %s;整数 %d;浮点数%f

print

"i am %s "

%

name

7.if for 格式
if name == 'xiaoneng': print('xiaoxxxx')elif name == 'xiaohua': print('xiaohuaxxxx')else: sys.exit
for i in range(10): print $i

#!/usr/bin/env python
if name == 'xiaoneng':
print('xiaoxxxx')
elif name == 'xiaohua':
print('xiaohuaxxxx')
else:
sys.exit

for i in range(10):
print $i