方法一：+号

a = [1, 2, 3, 9, 10]
b = [4, 5, 6, 7, 8]
c = a[:3] + b + a[3:]
print(c)
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[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

方法二：insert函数

fruit = ['pineapple','pear']
fruitlist = ['grape', 'uuu', 'ccc']
for x in fruitlist:
    fruit.insert(len(fruit),x) # len(fruit)表示根据fruit的长度动态插入
fruit
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方法三：append方法添加

fruit = ['pineapple','pear']
fruitlist = ['grape', 'uuu', 'ccc']
for x in fruitlist:
    fruit.append(x)
fruit
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方法4:extend()

extend()方法添加元素，extend() 和 append() 的不同之处在于：extend() 不会把列表或者元祖视为一个整体，而是把它们包含的元素逐个添加到列表中。

l = ['Python', 'C++', 'Java']
#追加元素
l.extend('C')
print(l)
#追加元组，元祖被拆分成多个元素
t = ('JavaScript', 'C#', 'Go')
l.extend(t)
print(l)
#追加列表，列表也被拆分成多个元素
l.extend(['Ruby', 'SQL'])
print(l)

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[‘Python’, ‘C++’, ‘Java’, ‘C’]
[‘Python’, ‘C++’, ‘Java’, ‘C’, ‘JavaScript’, ‘C#’, ‘Go’]
[‘Python’, ‘C++’, ‘Java’, ‘C’, ‘JavaScript’, ‘C#’, ‘Go’, ‘Ruby’, ‘SQL’]