python快捷键与命令函数

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。

原文地址:https://www.cnblogs.com/jdzhang1995/p/10451080.html