This Python code is WRONGPRO

Removing from a list while looping over it skips items. Two clean fixes.

# This Python code is WRONG 😳 — removing from a list while looping over it skips items.
nums = [2, 4, 6, 7, 8]
for n in nums:
    if n % 2 == 0:
        nums.remove(n)
print(nums)   # [4, 7] ?!  (4 and 8 survived)

# Fix: loop over a COPY
nums = [2, 4, 6, 7, 8]
for n in nums[:]:
    if n % 2 == 0:
        nums.remove(n)
print(nums)   # [7] ✓

# Cleaner fix: build a new list

No app yet? Install it, then open the app and type the code P3 in Code Library.