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Checking if a file exists is a common task in while working with files. There are several ways to check if a file exists without raising an unwanted exception, each with its own advantages and disadvantages.
Here are a few different approaches.
This method uses the
os.path module to check if a file exists and returns True or False.
This is the simplest and most straightforward way to check for the existence of a file.
import os if os.path.exists('path/to/file'): # do something
This method also uses the
os.path module and is similar to
os.path.exists(). However, it specifically checks if the path provided is a file and returns True or False.
import os if os.path.isfile('path/to/file'): # do something
This method uses a try-except block to try to open the file and catch the
FileNotFoundError exception that would be raised if the file does not exist.
If the file is not found, the code in the except block will be executed and you can handle the error as you see fit.
try: with open('path/to/file') as f: # do something except FileNotFoundError: # handle file not found error
pathlib library, added in python 3.4, provides an object-oriented interface for working with file system paths.
Path.exists() method can be used to check if a file exists and returns True or False.
from pathlib import Path if Path('path/to/file').exists(): # do something
Each of these approaches has its own advantages and disadvantages, and the best approach will depend on the specific needs of your project.
os.path.isfile() functions are easy to use and understand, but the
try-except block and the
Path.exists() method provide more control over handling errors.
It's important to note that if you are checking for the existence of a file before performing an action on it, it's always a good idea to check the file existence and then open it. This avoids race conditions where another process or thread might delete the file in the meantime.PYTHON
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