Fix: Python IndexError: list index out of range
How to fix Python IndexError list index out of range caused by empty lists, off-by-one errors, wrong loop bounds, deleted elements, and negative indexing mistakes.
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Fix: Python json.decoder.JSONDecodeError: Expecting value
How to fix Python JSONDecodeError Expecting value caused by empty responses, HTML error pages, invalid JSON, BOM characters, and API errors.
Fix: Python KeyError: 'key_name'
How to fix Python KeyError caused by missing dictionary keys, JSON parsing issues, environment variables, pandas DataFrame columns, and unsafe key access patterns.
Fix: Python ModuleNotFoundError even after pip install (venv / virtualenv)
How to fix ModuleNotFoundError in Python when packages are installed but not found inside a virtual environment. Covers venv activation, pip path issues, IDE settings, conda conflicts, and more.
Fix: Python PermissionError: [Errno 13] Permission denied
How to fix Python PermissionError Errno 13 Permission denied when reading, writing, or executing files, covering file permissions, ownership, virtual environments, Windows locks, and SELinux.
Fix: Python RuntimeError: dictionary changed size during iteration
How to fix Python RuntimeError dictionary changed size during iteration caused by modifying a dict while looping over it, with solutions using copies, comprehensions, and safe patterns.
Fix: Python SyntaxError: invalid syntax
How to fix Python SyntaxError invalid syntax caused by missing colons, parentheses, wrong operators, Python 2 vs 3 syntax, f-strings, and walrus operator issues.
Fix: Python TypeError: missing required positional argument
How to fix Python TypeError missing required positional argument caused by missing self, wrong argument count, class instantiation errors, and decorator issues.
Fix: Python TypeError: 'NoneType' object is not subscriptable
Learn why Python raises TypeError NoneType object is not subscriptable and how to fix it with practical solutions for functions, dictionaries, lists, APIs, and regex.
Fix: Python TypeError: takes X positional arguments but Y were given
How to fix Python TypeError takes positional arguments but were given caused by missing self, extra arguments, wrong function calls, and class method confusion.
Fix: Python UnicodeDecodeError – 'utf-8' codec can't decode byte
How to fix Python UnicodeDecodeError 'utf-8' codec can't decode byte in position invalid start byte, covering chardet detection, encoding fallback, BOM handling, pandas CSV encoding, and PYTHONIOENCODING.
Fix: Python ValueError: invalid literal for int() with base 10
How to fix Python ValueError invalid literal for int() with base 10 caused by passing float strings, whitespace, empty strings, or non-numeric characters to int().