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Python-List列表与列表函数

  • 2026-08-26 12:10:06
Python-List列表与列表函数

列表是Python中的一种对象,用于存储索引的项目列表。它使用带有逗号分隔项的方括号创建列表,列表中的某个项目可以使用方括号中的索引访问。

例子:

windows = ["Hello", "haoareyou", "!"]

print(windows[0])

print(windows[1])

print(windowss[2])

结果是:

>>>

Hell

haoareyou

!

>>>

需要注意的是:第一个列表项的索引是0,而不是1。

 问题一:这段代码的结果是?

nums = [5, 4, 3, 2, 1]

print(nums[1])

-----

Lists创建空的列表:用一对空的方括号创建空列表。

empty= []

print(empty)

结果:

>>>

[]

>>>

问题二:这个列表里有多少个项目?

[2,]

A1

B2

C3

Lists,列表将包含单个项类型的项目,但也可以包括若干不同类型。列表也可以嵌套在其他列表中。

number = 3

things = ["string", 0, [1, 2, number], 4.56]

print(things[1])

print(things[2])

print(things[2][2])

结果:

>>>

0

[1, 2, 3]

3

>>>

列表通常用于表示2D网格,因为Python缺少用于其他语言的多维数组。List索引可能超出列表值的范围会导致索引错误。某些类型,如字符串,可以像列表一样索引。索引字符串的行为就像在索引包含字符串中的每个字符的列表一样。对于其他类型,如整数,索引它们是不可能的,并且会导致类型错误。

str = "Hello world!"

print(str[6])

结果:

>>>

w

>>>

问题三:哪一行代码会产生错误

1.num = [5, 4, 3, [2], 1]

2.print(num[0])

3.print(num[3][0])

4.print(num[5])

A3行

B4行

C2行


lists-列表操作

列表索引的某个项目可以重新赋值

举例:

nums = [8, 8, 8, 8]

nums[3] =6

print(nums)

Result:

>>>

 [8, 8, 8, 6]

>>>

填空 创建一个列表list, 重新赋值第二个元素并打印

nums = [34, 45, 65] 

nums[1] = 22

print(nums)

 [34, 22, 65] 

list-列表乘&加

列表list 可以添加也可以相乘,字符串也一样

举个栗子:

nums = [2, 2, 4]

print(nums + [2, 3, 4])

print(nums * 2)

结果:

>>>

[2, 2, 4, 2, 3, 4]

[2, 2, 4,2, 2, 4 ]

>>>

列表和字符串在很多方面都是相似的——字符串可以被看作是无法更改的字符列表

List-检测-in

用in语句来检查列表中是否有某个项目,如果返回 True 则有,返回False则没有

words = ["spam", "egg", "spam", "sausage"]

print("spam" in words)

print("egg" in words)

print("tomato" in words)

结果:

>>>

True

True

False

>>>

in运算符还用于确定字符串是否是另一个字符串的子字符串。

填空 这段代码的运行结果是多少?

nums = [10, 9, 8, 7, 6, 5]

nums[0] = nums[1] - 5

if 4 in nums:

 print(nums[3])

else:

print(nums[4])

7

如果列表中包含z打印Yes

letters = ["a", "b", "z"]

lf "z" in letters:

  print("Yes")

List-检测-not

not语句可以检查某个元素不在列表里。如下:

nums = [1, 2, 3]

print(not 4 in nums)

print(4 not in nums)

print(not 3 in nums)

print(3 not in nums)

结果:

>>>

True

True

False

False

>>>


List-函数-append,更改列表的另一种方法是使用append方法。在列表的最后面添加一项。

numsa = [4,5,6]

numsa.append(5)

print(numsa)

结果:

>>>

[4,5,6,5]

>>>

List-函数-len,len方法用来查看列表中项目的个数

numsa = [3, 5, 7, 9, 11,13]

print(len(numsa))

结果:

>>>

6

>>>

List-函数-insert,insert 方法比较像 append,它允许你在列表中的任何位置插入一个新的项目,而不是只在最后一个位置

word = ["Python", "fun"]

one= 1

words.insert(one, "is")

print(word)

结果:

>>>

['Python', 'is', 'fun']

>>>

List-函数-index,index方法查找列表 第一个出现的项目并返回其索引。

如果项不在列表中,则会引发ValueError。

letters = ['p', 'q', 'r', 's', 'p', 'u']

print(letters.index('r'))

print(letters.index('p'))

print(letters.index('z'))

结果:

>>>

2

0

ValueError: 'z' is not in list

>>>

这里有一些关于列表list有用的方法,max(list): 返回列表中最大的值,min(list): R返回列表中最小的值,list.count(obj): 返回一个项目在列表中出现的次数,list.remove(obj): 从列表中删除一个项目,list.reverse(): 翻转列表中的项目


Range函数

range 函数 创建一个 有序的数字列表,

生成一个0到9的整数列表:

numbers = list(range(10))

print(numbers)

结果:

>>>

[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

>>>

列表的调用是必需的,因为range本身创建了一个范围对象,如果您想将它作为一个对象,则必须将其转换为列表。

如果range只有一个参数,它将产生一个0到参数的列表,如果range有两个参数,它将产生一个从一个参数到第二个参数的值的列表

例如:

numbers = list(range(2, 7))

print(numbers)

print(range(20) == range(0, 20))

结果:

>>>

[2, 3 4, 5, 6]

True

Range-参数3个,range 也可以有第三个参数, 它决定所产生的序列的间隔。这第三个参数必须是整数。

numbers = list(range(5, 20, 2))

print(numbers)

结果是:

>>>

[5, 7, 9, 11, 13, 15, 17, 19]


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  1. CONNECT:[ UseTime:0.001111s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001585s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000681s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000662s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001336s ]
  6. SELECT * FROM `set` [ RunTime:0.000534s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001482s ]
  8. SELECT * FROM `article` WHERE `id` = 512272 LIMIT 1 [ RunTime:0.001032s ]
  9. UPDATE `article` SET `lasttime` = 1787735391 WHERE `id` = 512272 [ RunTime:0.022255s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.002876s ]
  11. SELECT * FROM `article` WHERE `id` < 512272 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001280s ]
  12. SELECT * FROM `article` WHERE `id` > 512272 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001104s ]
  13. SELECT * FROM `article` WHERE `id` < 512272 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002356s ]
  14. SELECT * FROM `article` WHERE `id` < 512272 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002324s ]
  15. SELECT * FROM `article` WHERE `id` < 512272 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005048s ]
0.224799s