range() — Expert Examples

Generates an immutable sequence of integers

EasyIntermediateAdvancedExpert

range() performance and internals

Performance characteristics and CPython implementation details.

python
# range() internals
import dis

def using_range():
    pass

# Bytecode analysis
dis.dis(using_range)

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

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

Want to try these examples interactively?

Open Expert Playground
← Advanced Examples