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41 lines
808 B
Python
41 lines
808 B
Python
# Test walrus operator (:=)
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# Basic usage in if statement
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x = [1, 2, 3, 4, 5]
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if (n := len(x)) > 3:
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assert n == 5
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# Usage in while loop
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data = [1, 2, 3, 0, 4, 5]
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results = []
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i = 0
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while (val := data[i]) != 0:
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results.append(val)
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i += 1
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assert results == [1, 2, 3]
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# Usage in list comprehension filter
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values = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
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even_squares = [y for x in values if (y := x * x) % 2 == 0]
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assert even_squares == [4, 16, 36, 64, 100]
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# Walrus in expression context
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a = 10
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b = (a := a + 5) * 2
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assert a == 15
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assert b == 30
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# Nested parenthesized walrus
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result = (x := (y := 3) + 1)
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assert x == 4
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assert y == 3
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# Test function
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def test_walrus_in_function():
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result = (x := (y := 3) + 1)
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assert x == 4
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assert y == 3
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assert result == 4
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test_walrus_in_function()
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