filter() — Expert Examples
Returns elements from an iterable for which a function returns True
filter() performance and internals
Performance characteristics and CPython implementation details.
python
# filter() internals import dis def using_filter(): pass # Bytecode analysis dis.dis(using_filter) # Check if it's truly built-in import builtins print(f"\nfilter is builtin: {hasattr(builtins, 'filter')}") print(f"Type: {type(builtins.filter)}")
Understanding the internal implementation helps optimize hot paths in performance-critical code.
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