**? "loop" 循環? ?注意要有引號。
**pass 過
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#打印 1-100 start = 1 while start < 101:print("loop",start)start += 1
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#打印1-49,81-100. 60-80的平方 start = 1 while start <101 :if start >49 and start < 60:passelif start >59 and start < 81:print("loop",start*start )else:print("loop",start)start += 1
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