Copy a dictionary (shallow copy) Dry Run in PYTHON

Copy a dictionary (shallow copy) is an interactive PYTHON dry run visualizer from the Dict 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.

Copy a dictionary (shallow copy) Program Code

# Copy a dictionary
original = {"a": 1, "b": 2, "c": 3}
print("Original:", original)

# Method 1: copy() method
copied1 = original.copy()
print("Using copy():", copied1)

# Method 2: dict() constructor
copied2 = dict(original)
print("Using dict():", copied2)

# Method 3: Unpacking (Python 3.5+)
copied3 = {**original}
print("Using unpacking:", copied3)

# Method 4: Manual loop
copied4 = {}
for key, value in original.items():
    copied4[key] = value
print("Manual loop:", copied4)

# Verify independence
copied1["a"] = 999
print(f"\nAfter modifying copy: original['a']={original['a']}, copy['a']={copied1['a']}")

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