python---定义字典a = {}，获取内容

定义字典获取，获取相对应的值 aa = ['A', 'B', 'C'] #定义字典 a = {} #获取数组元素个数 num = len(aa) for i in range(num): ia = aa[1] if i >1: ia = aa[2] print(ia) a[ia] = a.get(ia, 0)+1 print(a)

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