How to read file content in python

The Python open() method is used to open a file and return a file object. This function needs to be used during file processing. If the file cannot be opened, an OSError will be thrown.

The complete syntax format is: (Recommended learning: Python video tutorial)

open(file, mode='r', buffering=None, encoding=None, errors=None, newline=None, closefd=True)

Parameter description:

file: required, file path (relative or absolute path).

mode: Optional, file opening mode

buffering: Set buffering

encoding: Generally use utf8

errors: Error reporting level

newline: distinguish newline characters

closefd: the file parameter type passed in to read the file

To open a file object in the file reading mode, use Python's built-in open() function, pass in File name and opening mode. The opening mode for reading files does not need to be passed. The default is mode='r'.

There is another problem. If there is Chinese in the content, if you use f = open(path,'r') to read the file, an encoding error will be reported. Therefore, it is best to pass three parameters in the correct way: pass in the file name, open mode and encoding parameters

Encoding (encoding) recommends utf-8 (it can also be written as utf8). This way, regardless of Chinese, English or mixed files All can be read. The open mode mode= does not need to be written, it is a direct parameter. Because the first parameter is the file name, the opening mode is the second parameter, and the encoding is the fourth parameter, it cannot be omitted.

If you want to read pictures or audio files, use 'rb' to open the mode, b represents binary.

How to read the content of a file

read(): read the entire content of the file at one time

readline(): read each time One line of content

readlines(): Read all the contents at once and return the list by line

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