wtfpython

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def foo(x):
    if x:
        y = 1
    print(f"y={y}")

foo(x=True)
y=1

foo(x=False)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 4, in foo
UnboundLocalError: local variable 'y' referenced before assignment