python 字典的函数
1 >>2 >>> index1={1:11,2:22,3:33} 3 >>> index1.pop(2) 4 22 5 >>> index1 6 {1: 11, 3: 33} 7 >>> index1.popitem() 8 (1, 11) 9 >>> index110 {3: 33}11 >>> index1.setdefault(4)12 >>> index113 {3: 33, 4: None}14 >>> index1.setdefault(5,55)15 5516 >>> index117 {3: 33, 4: None, 5: 55}18 >>> b={4:44}19 >>> a.update(b)20 >>> a21 {4: 44}22 >>> index1.update(b)23 >>> index124 {3: 33, 4: 44, 5: 55}25 >>>
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