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General Tech Bugs & Fixes 2 years ago
Posted on 16 Aug 2022, this text provides information on Bugs & Fixes related to General Tech. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.
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How do I see if a file exists or not, without using the try statement
try
If the reason you're checking is so you can do something like if file_exists: open_it(), it's safer to use a try around the attempt to open it. Checking and then opening risks the file being deleted or moved or something between when you check and when you try to open it.
if file_exists: open_it()
If you're not planning to open the file immediately, you can use os.path.isfile
os.path.isfile
Return True if path is an existing regular file. This follows symbolic links, so both islink() and isfile()can be true for the same path.
True
import os.path os.path.isfile(fname)
if you need to be sure it's a file.
Starting with Python 3.4, the pathlib module offers an object-oriented approach (backported to pathlib2 in Python 2.7):
pathlib
pathlib2
from pathlib import Path my_file = Path("/path/to/file") if my_file.is_file(): # file exists
To check a directory, do:
if my_file.is_dir(): # directory exists
To check whether a Path object exists independently of whether is it a file or directory, use exists():
Path
exists()
if my_file.exists(): # path exists
You can also use resolve(strict=True) in a try block:
resolve(strict=True)
try: my_abs_path = my_file.resolve(strict=True) except FileNotFoundError: # doesn't exist else: # exists
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