Python 增加元素有三种办法：append、extend、insert
append：向列表增加元素，增加到尾部
实例：
list=[“my”,”name”,”is”,”mark”,”age”,18]
print(“ 增加前：”,list)
list.append(“test”)
print(“ 增加后：”,list)
打印后果：
增加前：[‘my’, ‘name’, ‘is’, ‘mark’, ‘age’, 18]
增加后：[‘my’, ‘name’, ‘is’, ‘mark’, ‘age’, 18, ‘test’]
extend：将另外一个列表的元素逐个增加到指定列表中
实例：
list=[“my”,”name”,”is”,”mark”,”age”,18]
print(“extend 前：”,list)
list2=[“A”,”B”]
list.extend(list2)
print(“extend 后：”,list)
打印后果：
extend 前：[‘my’, ‘name’, ‘is’, ‘mark’, ‘age’, 18]
extend 后：[‘my’, ‘name’, ‘is’, ‘mark’, ‘age’, 18, ‘A’, ‘B’]
inset(index,objectA)：在指定地位 index 后面插入对象 objectA
实例：
list=[“my”,”name”,”is”,”mark”,”age”,18]
print(“insert 前：”,list)
list.insert(3,”test”)
print(“insert 后：”,list)
打印后果：
insert 前：[‘my’, ‘name’, ‘is’, ‘mark’, ‘age’, 18]
insert 后：[‘my’, ‘name’, ‘is’, ‘test’, ‘mark’, ‘age’, 18]
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