Python learns 21 days file readable, writable, actionable action

File is nothing but readable, writable, executable operation, corresponding to the mode R, W,x, read-only mode, write-only mode, only the mode of execution, a mode for Append mode, the actual write operation mode, r+,w+,a+ can read and write mode, the following detailed mode usage

1, mode usage of the file

R file does not exist will be an error

The W file does not exist and is created, but empties the contents of the file, writes the new content

A file does not exist and is created, but there is already a file append content

2, write operation of the file

The write operation of the file must be written in W mode in a mode,

Operation method

F=open (' Www.96net.com/robot.txt ', ' W ', encoding= ' utf-8 ')

F.write (' aaaaaaaaaaaaaa ')

F.close ()

3, the file's W mode and a mode difference

W file empties the previous content, writes content to the file

R file does not empty previous content, append content to File

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Python learns 21 days file readable, writable, actionable action