num + = num 不等于num = num + num
例如：
a = [100]def sum(num): # num += num num = num + num # 不等于num += num print(num)sum(a)print(a)
输出结果：[100,100]
[100]
a = [100]def sum(num): num += num print(num)sum(a)print(a)
输出结果：[100,100]
[100,100]
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num + = num 不等于num = num + num
例如：
a = [100]def sum(num): # num += num num = num + num # 不等于num += num print(num)sum(a)print(a)
输出结果：[100,100]
[100]
a = [100]def sum(num): num += num print(num)sum(a)print(a)
输出结果：[100,100]
[100,100]
转载于:https://www.cnblogs.com/sineik/p/8595985.html