An error will occur if the directory exists when the directory is created.

FileExistsError: [WinError 183]You cannot create a file that already exists.

How to check for existence

import os

DIR_NAME = 'dirname'
if not os.path.exists(DIR_NAME):
    os.mkdir(DIR_NAME)

How to handle exceptions

import os

DIR_NAME = 'dirname'
try:
    os.mkdir(DIR_NAME)
except OSError as ex:
    print(ex)

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