Python Shortcut: Swap Two Variables Without a Temporary Variable |
Learn one of the most elegant Python shortcuts that every data scientist, analyst, and engineer should know.
Instead of using a temporary variable to swap values, Python allows a tuple unpacking technique that does it in a single line!
This trick is widely used in data preprocessing, feature engineering, and algorithm development to make code clean, fast, and efficient.
Codes:
🧩 Long Way:
Swapping two variables (Traditional Way)
a = 10
b = 20
temp = a
a = b
b = temp
print(a, b)
⚡ One-Liner Shortcut:
a, b = b, a
print(a, b)
🧩 5 Interview Questions & Answers
Q1: What is tuple unpacking in Python?
A1: Tuple unpacking lets you assign multiple variables at once using commas, e.g., a, b = b, a.
Q2: Can this shortcut work for non-integer types like strings or floats?
A2: Yes, Python supports tuple unpacking for all variable types.
Q3: Why is this shortcut preferred over using a temporary variable?
A3: It improves code readability, reduces memory usage, and eliminates unnecessary lines.
Q4: How does Python handle swapping internally using a, b = b, a?
A4: Python creates a tuple (b, a) on the right-hand side and unpacks it into a and b.
Q5: Where can this be useful in data analysis?
A5: In swapping columns, values, or parameters during data transformation and algorithmic operations.
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