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最新推荐文章于 2025-08-08 11:09:55 发布

转载最新推荐文章于 2025-08-08 11:09:55 发布 · 72 阅读

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CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/xaiobong/p/9888798.html

文章标签：

#python

本文详细介绍了Python中列表的各种操作方法，包括内置函数使用、字符串转换、列表生成式、元素计数、删除方法等，同时展示了如何利用第三方库进行更复杂的数据处理。

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例子：

内置函数extend

1 a = [1,2,3]
2 b = [4,5]
3 a.extend(b)
4 print(a)

import numpy as np
s1 = [3, 5, 5, 5, 5]
print(np.sum(s1))

运行结果：23



运行结果：[1, 2, 3, 4, 5]

字符串切割成列表

1 a = "abcd"
2 s = list(a)
3 print(s)

运行结果：['a', 'b', 'c', 'd']

1 from functools import reduce
2 
3 def add1(x,y):
4     return x + y
5 
6 print(reduce(add1,range(1,10)))

运行结果：45

1 # 修改元素
2 str = ["a","b","c","d"]
3 def fun2(s):
4 
5     return s +"alvin"
6 
7 ret = map(fun2,str)
8 print(ret)
9 print(list(ret))

运行结果：

<map object at 0x01751710>
['aalvin', 'balvin', 'calvin', 'dalvin']

1 # 过滤
2 str = ["a","b","c","d"]
3 def funl(s):
4     if s != 'a':
5         return s
6 
7 ret = filter(funl,str)
8 print(ret)
9 print(list(ret))

运行结果：['b', 'c', 'd']

1 # 列表生成式
2 text = [str(x) for x in range(10)]
3 print(text)
4 text2 = [x for x in range(10)]
5 print(text2)

运行结果：['0', '1', '2', '3', '4', '5', '6', '7', '8', '9']
　　　　　[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

1 #查找索引
2 a = ["a","b","c","d"]
3 print("b的索引是：%s"% a.index("b"))
运行结果：b的索引是：1

1 #元素出现的次数
2 a = ["a","b","b","c","d"].count("b")
3 print("b出现的次数：%s" % a)
运行结果：b出现的次数：2

 1 # 列表删除方法3种
 2 
 3 a = ["a","b","c","d"]
 4 #1
 5 a.remove("a")
 6 a.remove(a[0])
 7 #2
 8 b = a.pop(1)# 返回删除的内容
 9 print(b)
10 #3
11 del a[0]

python列表中的所有值转换为字符串，以及列表拼接成一个字符串

>>> ls1 = ['a', 1, 'b', 2]
>>> ls2 = [str(i) for i in ls1]
>>> ls2
['a', '1', 'b', '2']
>>> ls3 = ''.join(ls2)
>>> ls3
'a1b2'

4位数全倒

from itertools import permutations
s = list(permutations('1234'))
a = [list(i) for i in s]
s2 = ["".join(i) for i in a]
print(s2)
['1234', '1243', '1324', '1342', '1423', '1432', '2134', '2143', '2314', '2341', '2413', '2431', '3124', '3142', '3214', '3241', '3412', '3421', '4123', '4132', '4213', '4231', '4312', '4321']