Python files and streams (instance description ),

Python files and streams (instance description ),

1. File writing

# Opening the file. If the path is incorrect, the error f = open (r "C: \ Users \ jm \ Desktop \ pyfile.txt", "w") f. write ("Hello, world! \ N ") f. close ()

2. File Reading

# Read f = open (r "C: \ Users \ jm \ Desktop \ pyfile.txt", "r") print (f. read () f. close () Output: Hello, world!

3. read/write rows

Readline ([size]) reads the entire line, including the "\ n" character.

Readlines ([sizehint]) reads all rows and returns the list. If sizeint> 0 is specified, the total number of rows returned is approximately sizeint bytes. The actual read value may be larger than sizhint, because the buffer needs to be filled.

Writelines (sequence) writes a sequence string list to the file. If you need to wrap the string, add the line break for each line.

4. file objects can be iterated and can be used directly in the for loop.

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