loops(python3)

Sometimes, you need to perform code on each item in a list. This is called iteration, and it can be accomplished with a while loop and a counter variable.
For example:

words = [‘hello’, ‘words’, ‘viggies’, ‘eggs’]
counter = 0
max_index = len(words) – 1

while counter <= max_index:
word = words[counter]
print(word + ‘!’)
counter = counter+1

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原文链接：loops(python3)