1.join()
只能用在每个元素都是字符串的时候可以用，要不然就会报错
li = [‘1‘,‘2‘,‘3‘,"wewe","eee"] a = ‘_‘.join(li) # 语法：str.join(sequence) print(a) <<<<1_2_3_wewe_eee
2.for 循环
li = [1,2,3,"wewe","eee"] a = ‘‘ for i in li: a = a+str(i)+‘_‘ print(a.strip(‘_‘)) <<<<1_2_3_wewe_eee
原文：https://www.cnblogs.com/whileke/p/11304831.html