Context Manager using @contextmanager Decorator Dry Run in PYTHON

Context Manager using @contextmanager Decorator is an interactive PYTHON dry run visualizer from the Advancedpython programs section. Study the source code, then use the execution controls to follow each step, variable update, highlighted line, and console output.

This page provides a browser-based dry run with source-code highlighting, auto-scroll, voice narration controls, and execution output for learning the program step by step.

Context Manager using @contextmanager Decorator Program Code

from contextlib import contextmanager

@contextmanager
def file_manager(name, mode):
    try:
        print("Opening file mock...")
        yield f"FileMock[{name}]"
    finally:
        print("Closing file mock...")

with file_manager("test.txt", "r") as f:
    print(f"Inside: {f}")

View the complete Advancedpython programs page.