}

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golang go type error type conversion interface

Fix 'cannot use X (type Y) as type Z' in Go — Type Mismatch Guide

Fix 'cannot use X (type Y) as type Z' in Go. Covers explicit conversions, interface satisfaction, pointer vs value receivers, and type assertions with the ok pattern.

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golang go error compile variables blank identifier

Fix 'declared and not used' Error in Go (2026)

Fix Go's 'declared and not used' compile error. Learn why Go enforces this, how to use the blank identifier _, and common cases like loop variables and error returns.

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golang go error compile main package

Fix: "function main is undeclared in the main package" in Go

Fix the Go error "runtime.main_main·f: function main is undeclared in the main package". Covers all 5 causes with code examples and step-by-step solutions.

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golang go error compile import goimports

Fix 'imported and not used' Error in Go (2026)

Fix Go's 'imported and not used' compile error. Remove the import, use blank import for side effects, or use goimports for automatic management.

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golang go error nil pointer panic runtime

Fix 'nil pointer dereference' Panic in Go (2026)

Fix Go's 'nil pointer dereference' runtime panic. Covers nil pointers, nil interfaces, nil maps, uninitialized structs, stack trace reading, and nil-safe patterns.

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golang go error compile undefined import

Fix 'undefined: functionName' Error in Go (2026)

Fix the Go 'undefined: functionName' compile error. Covers wrong package, unexported names, typos, missing imports, and circular imports with before/after code.

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python error AttributeError NoneType debugging hasattr getattr

Fix Python AttributeError: 'X' object has no attribute 'Y' (2026)

Fix Python AttributeError 'X' object has no attribute 'Y'. Covers None from functions, typos, missing self.attr in __init__, wrong types, module errors, hasattr and getattr.

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python error IndentationError TabError tabs spaces PEP8 editorconfig

Fix Python IndentationError and TabError: Tabs vs Spaces (2026)

Fix Python IndentationError unexpected indent and TabError inconsistent use of tabs and spaces. Covers PEP 8, VS Code, vim retab, python -tt, and .editorconfig.

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python error ModuleNotFoundError pip import virtualenv venv

Fix Python ModuleNotFoundError: No module named 'X' (2026)

Fix Python ModuleNotFoundError: No module named 'X'. Covers pip install, wrong Python version, venv not activated, sys.path debugging, and import name differences.

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python error TypeError subscriptable NoneType debugging

Fix Python 'TypeError: X object is not subscriptable' (2026)

Fix Python TypeError 'NoneType' object is not subscriptable. Covers what subscriptable means, NoneType from None-returning functions, int/float errors, and isinstance checks.