5/30/2023 0 Comments Simple notepad import problemTerminal), change to your Desktop folder: $ cd ~/DesktopĪnd now that you're in the interactive Python interpreter, try to open a filename that you know does not exist on your Desktop, and then enjoy the error message: > myfile = open ( "whateverdude.txt" ) -įileNotFoundError Traceback (most recent call last) Let's start from scratch by making an error. Here's a surefire fix: make sure the file actually exists. Don't try to fix other parts of your code that aren't related to specifying filenames or paths. Or, even if you do, you don't know how to tell your Python program where it is. The error FileNotFoundError occurs because you either don't know where a file actually is on your computer. Don't restart your computer, then re-run the script to see if the error magically fixes itself. Don't try to install a new Python library. But the first step in not wasting your time is that if you ever see this error, stop whatever else you are doing. Sometimes, it's a simple typo, trying to open() a file named "example.txt" but accidentally misspelling it as "exmple.txt".īut more often, it's because you know a file exists under a given filename, such as "example.txt" – but how does your Python code know where that file is? Is it the "example.txt" that exists in your Downloads folder? Or the one that might exist in your Documents folder? Or the thousands of other folders on your computer system? You'll get this error because you tried to open a file that simply doesn't exist. Try putting spaces where the capitalization occurs: File Not Found Error So, read it: What does FileNotFoundError mean? In fact, I've seen students waste dozens of hours trying to get past this error message, because they don't stop to read it. FileNotFoundError: No such file or directory: 'SOME_FILENAME' Here is likely the most common error you'll get when trying to open a file. That seems easy enough, so let's jump into some common errors. To open a file, we simply use the open() method and pass in, as the first argument, the filename: myfile = open ( "example.txt" ) How to open a file – an interactive exploration Not only that, we also have to manually close the file. Still seem too complicated? Well, there's no getting around the fact that at the programmatic layer, opening a file is distinct from reading its contents. (Note: If you're getting a FileNotFoundError already – that's almost to be expected. Here's how to read that file, line-by-line, using a for-loop: myfile = open ( "example.txt" ) for line in myfile : print ( line ) myfile. close ()ĭid that seem too complicated? Here's a less verbose version: myfile = open ( "example.txt" ) print ( myfile. myfile = open ( "example.txt" ) txt = myfile. Here's a short snippet of Python code to open that file and print out its contents to screen – note that this Python code has to be run in the same directory that the example.txt file exists in. If you don't, just create one, and then fill it with these lines and save it: hello world Pretend you have a file named example.txt in the current directory. Let's just go straight to a code example. But before reading that, let's dive into the bare minimum that I want you to know. Here's the official Python documentation on reading and writing from files. The basic pattern of opening and reading files in Python
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