Variable declaration reset: Difference between revisions
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=={{header|Python}}==
In Python, variables are supposed to be defined before they are used, but the undefined variable `prev` is still not equal to `curr` below, so the code runs nevertheless. Note that a Python code checker such as pyflakes will flag such code.
<lang python>
s = [1, 2, 2, 3, 4, 4, 5]
for i in range(len(s)):
curr = s[i]
if i > 0 and curr == prev:
print(i)
prev = curr
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2
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