If you try to use isdir to check whether a file exists, the method will return False. This is similar to how the isfile method responds to directories. In Python, you can check whether certain files or directories exist using the isfile and isdir methods, respectively.
However, if you use isfile to check if a certain directory exists, the method will return False. Likewise, if you use if isdir to check whether a certain file exists, the method returns False.
But what if you want to check whether a certain file or directory exists? You can use the os. Say that you want to know whether the file. You could use the following code to check if that file exists:. Two months after graduating, I found my dream job that aligned with my values and goals in life! In addition, if we want to check whether the directory.
The isfile , isdir and exists methods allow you to do so. The following table summarizes when to use what function in Python you should use to determine whether certain files or directories exist:. To do so, use the following code: import os. Read our How to Learn Python article for advice on how you can acquire the skills you need to master Python. About us: Career Karma is a platform designed to help job seekers find, research, and connect with job training programs to advance their careers.
Learn about the CK publication. James Gallagher is a self-taught programmer and the technical content manager at Career Karma. James has written hundreds of programming tutorials, and he frequently contributes to publications like Codecademy, Treehouse, Repl. Similar to the Pathlib. This method is called the. When we create a Path object with a file path, we can use the.
This looks very similar to the method for checking if a file exists, except that we pass a directory into the object, rather than a file. Pathlib also comes with an intuitive way to check if either a file or directory exists, regardless of its type.
The other methods actually check if a file is a file and if it exists in the case of. This method is the. The Python os module allows us to interact with, well, the operating system itself.
As part of this, there are a number of helpful functions included. One of these, path. The path. It returns a boolean value. The function will return True if the path points to a file and the file exists.
Similar to the os. The latter will create the file if it exists, but not otherwise. It will, however, fail if the file exists, but you don't have permission to write to it. That's why I prefer the first solution. It seems to me that all other answers here so far fail to address the race-condition that occurs with their proposed solutions.
Any code where you first check for the files existence, and then, a few lines later in your program, you create it, runs the risk of the file being created while you weren't looking and causing you problems or you causing the owner of "that other file" problems.
If you want to avoid this sort of thing, I would suggest something like the following untested :. This should open your file for writing if it doesn't exist already, and return a file-object. If, on the other hand, you want to leave the file alone if it exists, but put specific non-empty contents there otherwise, then more complicated approaches based on if os.
This was the best way for me. You can retrieve all existing files be it symbolic links or normal :. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Pythonic way to check if a file exists? Asked 11 years, 11 months ago. However, if you're a beginner, there are always ways to learn Python. Since Python is a vast language, it's best to spend some time understanding the different nuances and its range of commands.
Python is extremely versatile, with applications ranging from web development to data analysis. Wini is a Delhi based writer, having 2 years of writing experience. During her writing stints, she has been associated with digital marketing agencies and technical firms. She has written content related to programming languages, cloud technology, AWS, Machine Learning, and much more.
In her free time, she likes to paint, spend time with her family and travel to the mountains, whenever possible. Try and Except Statements The try and except statement checks a command and produces an output.
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