if — Advanced Playground

Starts a conditional statement; executes block only if condition is true

Python Playground

# Without walrus
import re
text = "Call us at 555-1234 for info"
match = re.search(r'\d{3}-\d{4}', text)
if match:
    print(f"Found: {match.group()}")

# With walrus operator
if m := re.search(r'\d{3}-\d{4}', text):
    print(f"Found: {m.group()}")

# In while loops
data = [1, 2, 3, 0, 4, 5]
it = iter(data)
while (val := next(it, None)) is not None:
    if val == 0:
        break
    print(val, end=" ")
print()

Output

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The walrus operator := assigns a value and returns it in one expression. It reduces redundancy in patterns where you check and use the same value.

Challenge

Try modifying the code above to explore different behaviors. Can you extend the example to handle a new use case?

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