Python loop distinction (while loop and for loop)

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Applicability
while loop , For cycles with unknown number of cycles ;
for loop , For cycles with known number of cycles ;

Explain in detail
1、【 The number of cycles is basically known 】for Suitable for traversing data , The data traversal ends when there is no data ;
2、【 The number of cycles is basically unknown , End the loop by judging the inverse of the condition 】while Before circulation , We need to judge the conditions , It is relatively suitable for loops with complicated logic ;

remarks ：while Circulation and for loop , Part of it can be switched between the two ！！！

explain
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