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How to check if a Python variable exists? - GeeksforGeeks

Explanation: This code checks if the variable a exists in the local scope using locals().If a is defined locally, it prints True otherwise, it prints False. In this case, since a = 56 is defined, it will print True.. Using globals() If the variable is declared at the module level outside any functions or classes, it resides in the global scope.

https://iifx.dev/en/articles/241617

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file exists - Efficiently Determining File Existence in Python

Efficiently Determining File Existence in Python . 2025-04-26 . Checking File Existence in Python Without Exceptions. In Python, we often need to determine if a file exists before performing operations like reading, writing, or deleting it. One common approach involves ...

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python - Why does string.find() return -1? - Stack Overflow

@PHD In most cases like this (including the otherwise-identical str.index, which is also available on other sequences), Python returns failure by raising an appropriate exception.I suspect the main reason we have non-raising, -1 returning str.find as well is that C strstr does that. It’s how Guido presumably initially implemented string.find, so it would be in his head.

https://tecadmin.net/python-check-file-directory-exists/

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How to check if a file or directory exists in Python - TecAdmin

The Python os.path module is used for the file or directory pathename’s manipulations. The method isfile() of this module is used to check if any file is available or not. Similarly exists() function returns true for files and directory exists.. This tutorial includes: Check if file exists in Python ; Check if file is readable in Python ; Create directory if not exists in Python

https://www.w3resource.com/python-exercises/python-basic-exercise...

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Python: Check if file exists - w3resource

Write a Python program that checks whether multiple files exist in a given directory. Write a function that verifies if a file exists and is writable. Write a script that takes a filename as input and checks whether it exists, and if so, displays its size. Write a program to check if a given file exists and is a symbolic link. Go to:

https://www.i2tutorials.com/how-to-check-if-a-variable-exists-in-...

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How to check if a variable exists in Python? - i2tutorials

We can check if a variable exists or not using the following ways. Using locals() Using globals() Using hasattr() Using list.count() Using in operator . 1. Using locals(): This method takes in no attribute but returns a list of all the local variables in the form of a dictionary. Example:

https://www.geeksforgeeks.org/why-am-i-getting-a-filenotfounderro...

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How to fix FileNotFoundError in Python - GeeksforGeeks

Python provides the os.path.exists() method from the built-in os module to check whether a file exists at a given path. ... If the file does not exist, using write mode ("w") in Python will automatically create it. This is useful when you want to ensure the file exists, ...

https://discuss.python.org/t/sys-setprofile-does-not-dipatch-c-ex...

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`sys.setprofile` does not dipatch C Extension dunder methods - Python ...

I am trying to log all the function calls that happen. Within Python, as well as any of the C Extensions. But I see that dunder/magic methods defined within the C extensions are not registered with sys.setprofile. Is this the expected behaviour? If yes, are there any other means for me to log such events? Or is this a bug in CPython? Code to reproduce: # c_extensions.c #define PY_SSIZE_T_CLEAN ...

https://www.analyticsvidhya.com/blog/2024/02/check-if-element-exi...

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Check if Element Exists in List in Python - Analytics Vidhya

Handling and manipulating lists is essential in Python programming, especially for beginners. Whether you’re working with a tuple, a list of lists, or any data structure Python, knowing how to check if an element exists within a Python find element in list is fundamental.This tutorial will walk you through various techniques to achieve this, using practical examples and considering both time ...

https://pytutorial.com/understanding-valueerror-in-python-list-op...

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Understanding ValueError in Python List Operations - PyTutorial

Learn how to handle ValueError in Python list operations like remove and index. Fix common errors with examples and best practices.

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