如何通过更改名称覆盖文件？

Question

I have something.txt and nothing.txt . How can I change the name of nothing.txt to something.txt and at the same time remove the old something.txt ?

Answer 1

You can check if the first file exist. And if it does, remove it first.

from os import path, rename, remove


def mv(source, destination, overwrite=True):
    if path.isfile(destination):
        if overwrite:
            remove(destination)
        else:
            raise IOError("Destination file already exist")
    rename(source, destination)

Answer 2

Using pathlib is easier. It is just .rename

from pathlib import Path

nothing = Path('nothing.txt')
nothing.rename('something.txt')

Demo Script

from pathlib import Path

# create file and populate with text for demo
with Path('something.txt').open('w') as f:
    f.write('something old!')

# check contents
print(Path('something.txt').open('r').readline())


nothing =  Path('nothing.txt')
with nothing.open('w') as f:
    f.write('something new!')
    
# rename replaces the old something with new
nothing.rename('something.txt')

# check results
print(Path('something.txt').open('r').readline())