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【23】Python基础笔记2-只争朝夕-51CTO博客
source link: http://blog.51cto.com/000011211684/2068243
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1、请用代码实现：利用下划线将列表的每一个元素拼接成字符串li=['alex','eric','rain']print("_".join(li))print(li[0]+"_"+li[1]+"_"+li[1])3、写代码，有如下列表，按照要求实现每一个功能li=['alex','eric','rain']•计算列表长度并输出print(len(li)
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