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Accidentally Overwriting Built-In Functions: A Restoration Guide
Overwriting built-in functions by accident can be frustrating, especially when you're working with a long-running session. Fortunately, there are ways to restore the original functionality without resorting to restarting your session.
Solution: Deleting the Masking Variable
To restore the original built-in function, simply delete the variable name that you used to overwrite it. For example, if you accidentally set set as a variable, run the following command:
<code class="python">del set</code>
Now, set will refer to the original built-in set function.
Alternative: Accessing Built-Ins Through the Builtins Module
If you want to use the original built-in function from your overwritten function, you can access it through the builtins module. In Python 3, this module is called builtins, while in Python 2, it's called __builtin__. For example, if you overwrote set but want to use the original one, you can do:
<code class="python">import builtins original_set = builtins.set</code>
Determining the Masking Namespace
If you're unsure where the masking name is defined, check the namespaces from your current one up to the built-ins. Use the scoping rules described in "Short description of the scoping rules?" to determine which scopes may be relevant.
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