__import__() — Expert Examples

Low-level function invoked by the import statement

EasyIntermediateAdvancedExpert

__import__() performance and internals

Performance characteristics and CPython implementation details.

python
# __import__() internals
import dis

def using___import__():
    pass

# Bytecode analysis
dis.dis(using___import__)

# Check if it's truly built-in
import builtins
print(f"\n__import__ is builtin: {hasattr(builtins, '__import__')}")
print(f"Type: {type(builtins.__import__)}")

Understanding the internal implementation helps optimize hot paths in performance-critical code.

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