Python (ii)

file Processing

1. File processing mode

R: Open file in read-only mode

W: Open file in write-only mode: If the file exists or has content, it will be the original content, does not exist to create

A: Open file in Append mode

R+b: Open file in read-write mode

W+b: Open file in read-write mode

A+b: Open file in Append and read mode

2. Test:

      Read Only:  f = file (' Aaa.txt ', ' R ')      #只读模式打开              f.readline ()                      #查看文件内容              f.close ()                         #结束        Write only:   f = file (' Aaa.txt ', ' W ')      #只写模式打开              f.write (' New-line ')             #写入内容, will cover              f.clone ()       Append:   f = file (' aaa.txt ', ' a ' \ n)   # Append mode open, add line break    &nbsP;        f.write (' www ')                  #写入内容              f.close ()

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string Processing

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List

1. Concept: Store a set of data equal to an array in another language

2. Example:

    (1) List >>> name_list = [' Zhao ', ' Qian ', ' Sun ']>>> name_ list [' Zhao ',  ' qian ',  ' Sun ']>>> name_list[0] zhao       (2) Additional                >> > name_list.append (' li ')     #append是追加的意思 >>> name_list [' Zhao ',  ' Qian ',  ' Sun ',  ' Li ']    (3) appended to the specified line after >>> name_list.insert (2, ' ' ")      #追加到第二行的后面 >>> name_list[' Zhao ',  ' Qian ',  ' to ',  ' Sun ',  ' li '     (4) Remove  >>>name_list.remove (' Zhao ') >>> name_list[  ' Qian ',   ',  ' Sun ',  ' li ']    (5) statistics show how many times >>> name_list.append (' Zhao ') > >> name_list [' Zhao ',  ' qian ',  ' Sun ',  ' li ', ' Zhao '] >>>name_ List.count (' Zhao ')       #出现了两次2     (6) View location >>> name_list [' Zhao ',  ' qian ',  ' sun ',  ' li ', ' Zhao '] >>> name_list.index (' Qian ') 1       (7) In case of knowing the string position, intercept >>> name_list[' Zhao ',  ' Qian ', ' Sun ',  ' li ', ' Zhou ', ' Wu ', ' Zheng ', ' Wang ' >>>name_list [0:5][' Zhao ',  ' Qian ', ' Sun ',  ' li ', ' Zhou ', ' Wu ']    (8) Intercept >>> name_list[' Zhao ',  ' Qian ', ' Sun ',  ' li ', ' Zhou ', ' Wu ', ' Zheng ', ' Wang ', without knowing the string position >>>name_list[name_list.index (Zhao): Name_list.index (Zhao) +4] #从zhao开始截取四个包括zhao [' Zhao ',  ' Qian ',   ' Sun ',  ' li '

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Meta-group

1. Concept: Non-modifiable, other similar to the list

This article is from the "Ming python" blog, so be sure to keep this source http://pythonzhai.blog.51cto.com/10391994/1720729

Python (ii)