How to overwrite a folder if it already exists when creating it with makedirs?

问题

The following code allows me to create a directory if it does not already exist.

dir = 'path_to_my_folder'
if not os.path.exists(dir):
    os.makedirs(dir)

The folder will be used by a program to write text files into that folder. But I want to start with a brand new, empty folder next time my program opens up.

Is there a way to overwrite the folder (and create a new one, with the same name) if it already exists?

回答1:

import os
import shutil

dir = 'path_to_my_folder'
if os.path.exists(dir):
    shutil.rmtree(dir)
os.makedirs(dir)

回答2:

import os
import shutil

path = 'path_to_my_folder'
if not os.path.exists(path):
    os.makedirs(path)
else:
    shutil.rmtree(path)           # Removes all the subdirectories!
    os.makedirs(path)

How about that? Take a look at shutil's Python library!

回答3:

os.path.exists(dir) check is recommended but can be avoided by using ignore_errors

dir = 'path_to_my_folder'
shutil.rmtree(dir, ignore_errors=True)
os.makedirs(dir)

回答4:

Just say

dir = 'path_to_my_folder'
if not os.path.exists(dir): # if the directory does not exist
    os.makedirs(dir) # make the directory
else: # the directory exists
    #removes all files in a folder
    for the_file in os.listdir(dir):
        file_path = os.path.join(dir, the_file)
        try:
            if os.path.isfile(file_path):
                os.unlink(file_path) # unlink (delete) the file
        except Exception, e:
            print e

回答5:

try:
    os.mkdir(path)
except FileExistsError:
    pass

回答6:

Here's a EAFP (Easier to Ask for Forgiveness than Permission) version:

import errno
import os
from shutil import rmtree
from uuid import uuid4

path = 'path_to_my_folder'
temp_path = os.path.dirname(path)+'/'+str(uuid4())
try:
    os.renames(path, temp_path)
except OSError as exception:
    if exception.errno != errno.ENOENT:
        raise
else:
    rmtree(temp_path)
os.mkdir(path)

来源：https://stackoverflow.com/questions/11660605/how-to-overwrite-a-folder-if-it-already-exists-when-creating-it-with-makedirs

标签

python