Python学习小白,在学习Python时遇到以下程序,想咨询下["+str(i)+"]的用法示意,为什么在str(i)前后加+?谢谢
list1 = [1,2,3,4,5]
list2 = ['a','b','c','d','e']
for i in range(len(list1)):
print("list1[" + str(i) + "]"," = ",list1[i], "list2[" + str(i) + "]"," = ",list2[i],end = " ")
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