The difference between read() method, readline() method and readlines() method
Python file operation
The difference between read() method, readline() method and readlines() method
1.read([size]) method
Read size bytes from the current position of the file. If there is no parameter size, it means that it is read until the end of the file. Its scope is a string object
Print 3 bytes
Output result
read() method
Print all content by default
Output result
2.readline() method
It can be seen from the literal meaning that this method reads one line of content at a time, so it occupies less memory when reading and is more suitable for large files. This method returns a string object.
Output result:
Because readline reads by line and prints by line, and the print function is output by default and needs to cross lines! So there is a blank line in the middle of every printed line
3.readlines() method
Read all lines of the entire file and save them in a list variable, each line as an element, but reading large files will take up more memory
Output result:
Add a string after a certain line (but this method costs memory)
Output result:
Does not occupy memory:
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