tab 自动补齐
alt+P 前一个命令
alt +N 下一个命令
""" """ 三重引号为注释(也可以用单引号)
# 改行后面的都为注释
查看Python模块的位置
>>> import sys
>>> sys.path
['E:\Python34\Lib\idlelib', 'C:\Windows\system32\python34.zip', 'E:\Python34\DLLs', 'E:\Python34\lib', 'E:\Python34', 'E:\Python34\lib\site-packages']
import 模块
模块名.函数名(数据)
数据.函数()
dir(__builtins__) 查看pyton内置函数
help(input) 看input()用法
数据的添加和删除
>>> movies=["The holy grail","the life of brian","the meaning of life"]
append(),pop()用于增加或者删除末尾的数据
extend()用于在列表后面加一个数据项集合
remove()删除一个特定的数据项
insert()在某个具体的位置加上数据
>>> movies.append("wo de ")
>>> print(movies)
['The holy grail', 'the life of brian', 'the meaning of life', 'wo de ']
>>> movies.pop()
'wo de '
>>> print(movies)
['The holy grail', 'the life of brian', 'the meaning of life']
>>> movies.extend(["gillima","chapam"])
>>> print(movies)
['The holy grail', 'the life of brian', 'the meaning of life', 'gillima', 'chapam']
>>> movies.remove("chapam")
>>> print(movies)
['The holy grail', 'the life of brian', 'the meaning of life', 'gillima']
>>> movies.insert(0,"1")
>>> print(movies)
['1', 'The holy grail', 'the life of brian', 'the meaning of life', 'gillima']
>
len处理列表时候表示列表元素的个数,处理元素的时候表示元素的字符个数。
>>> for num in range(4):
print(num)
0
1
2
3
#这个里面是不好4的。
(role, line_spoken) = each_line.split(':', 1)
line_spoken = line_spoken.strip()
#strip(去掉开头和结尾处的空白符, , , )
(mins, secs) = time_string.split(splitter)
return(mins + '.' + secs)
#注意上面的+用来连接两部分
if '-' in time_string:
splitter = '-'
#注意in的作用
set() #工厂函数,用于去掉重复的部分,没有重复的数据叫集合。