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Linux运维基础Python 列表学习教程

  • 2026-08-18 23:11:53
Linux运维基础Python 列表学习教程

一、列表的基本概念

1.1 什么是列表?

列表(List)是 Python 中最常用的数据结构之一,用于存储有序的元素集合。列表是可变的(mutable),意味着可以修改其内容。

1.2 列表的特点

  • 有序性:元素按插入顺序排列

  • 可变性:可以修改、添加、删除元素

  • 异构性:可以存储不同类型的元素

  • 可嵌套:列表中可以包含其他列表

  • 动态大小:会根据需要自动调整大小

1.3 列表的定义

# 空列表
empty_list= []
empty_list2=list()

# 包含元素的列表
numbers= [12345]
fruits= ["apple""banana""cherry"]
mixed= [1"apple"3.14True, [123]]  # 异构列表

二、列表的访问和索引

2.1 索引访问

列表中的每个元素都有一个索引,从 0 开始:

fruits= ["apple""banana""cherry"]
print(fruits[0])    # 输出: apple
print(fruits[1])    # 输出: banana
print(fruits[2])    # 输出: cherry

# 负索引(从末尾开始)
print(fruits[-1])   # 输出: cherry
print(fruits[-2])   # 输出: banana
print(fruits[-3])   # 输出: apple

2.2 切片操作

切片语法:list[start:end:step]

  • start:起始索引(包含)

  • end:结束索引(不包含)

  • step:步长(默认为 1)

numbers= [0123456789]
print(numbers[0:5])      # 输出: [0, 1, 2, 3, 4]
print(numbers[5:])       # 输出: [5, 6, 7, 8, 9]
print(numbers[:5])       # 输出: [0, 1, 2, 3, 4]
print(numbers[::2])      # 输出: [0, 2, 4, 6, 8] (步长为 2)
print(numbers[::-1])     # 输出: [9, 8, 7, 6, 5, 4, 3, 2, 1, 0] (反转列表)
print(numbers[1:8:2])    # 输出: [1, 3, 5, 7] (从索引1到8,步长为2)

2.3 嵌套列表访问

nested= [[123], [456], [789]]
print(nested[0])       # 输出: [1, 2, 3]
print(nested[1][1])    # 输出: 5
print(nested[2][0])    # 输出: 7

三、列表的基本操作

3.1 列表长度

fruits= ["apple""banana""cherry"]
length=len(fruits)  # 输出: 3

3.2 列表拼接

list1= [123]
list2= [456]
combined=list1+list2# 输出: [1, 2, 3, 4, 5, 6]

3.3 列表重复

list1= [123]
repeated=list1*3# 输出: [1, 2, 3, 1, 2, 3, 1, 2, 3]

3.4 成员检查

fruits= ["apple""banana""cherry"]
print("apple"infruits)     # 输出: True
print("orange"infruits)    # 输出: False
print("banana"notinfruits# 输出: False

3.5 列表比较

list1 = [1, 2, 3]
list2 = [1, 2, 3]
list3 = [1, 2, 4]

print(list1 == list2)  # 输出: True
print(list1 == list3)  # 输出: False
print(list1 < list3)   # 输出: True (按元素逐个比较)

四、列表的修改操作

4.1 修改元素

fruits = ["apple", "banana", "cherry"]
fruits[1] = "orange"  # 修改索引1处的元素
print(fruits)  # 输出: ["apple", "orange", "cherry"]

4.2 添加元素

  • append():在列表末尾添加元素

  • insert():在指定位置插入元素

  • extend():扩展列表,添加多个元素

fruits = ["apple", "banana", "cherry"]

# append()
fruits.append("orange")
print(fruits)  # 输出: ["apple", "banana", "cherry", "orange"]

# insert()
fruits.insert(1, "grape")
print(fruits)  # 输出: ["apple", "grape", "banana", "cherry", "orange"]

# extend()
fruits.extend(["mango", "pineapple"])
print(fruits)  # 输出: ["apple", "grape", "banana", "cherry", "orange", "mango", "pineapple"]

4.3 删除元素

  • remove():删除指定值的元素

  • pop():删除指定索引的元素并返回

  • del:删除指定索引或切片的元素

  • clear():清空列表

fruits = ["apple", "banana", "cherry", "banana", "orange"]

# remove()
fruits.remove("banana")  # 删除第一个匹配的元素
print(fruits)  # 输出: ["apple", "cherry", "banana", "orange"]

# pop()
popped = fruits.pop(1)  # 删除索引1处的元素
print(popped)  # 输出: cherry
print(fruits)  # 输出: ["apple", "banana", "orange"]

# del
del fruits[0]  # 删除索引0处的元素
print(fruits)  # 输出: ["banana", "orange"]

del fruits[0:2]  # 删除切片
print(fruits)  # 输出: []

# clear()
fruits = ["apple", "banana", "cherry"]
fruits.clear()
print(fruits)  # 输出: []

五、列表方法

5.1 查找方法

  • index():返回指定值第一次出现的索引

  • count():返回指定值出现的次数

numbers = [1, 2, 3, 2, 1, 2, 3]
print(numbers.index(2))    # 输出: 1 (第一次出现的位置)
print(numbers.count(2))    # 输出: 3 (出现的次数)

5.2 排序方法

  • sort():原地排序

  • sorted():返回排序后的新列表

  • reverse():原地反转列表

numbers = [3, 1, 4, 1, 5, 9, 2, 6]

# sort()
numbers.sort()
print(numbers)  # 输出: [1, 1, 2, 3, 4, 5, 6, 9]

# 降序排序
numbers.sort(reverse=True)
print(numbers)  # 输出: [9, 6, 5, 4, 3, 2, 1, 1]

# 自定义排序
fruits = ["banana", "apple", "cherry", "date"]
fruits.sort(key=len)  # 按长度排序
print(fruits)  # 输出: ["date", "apple", "cherry", "banana"]

# sorted()
numbers = [3, 1, 4, 1, 5]
sorted_numbers = sorted(numbers)
print(sorted_numbers)  # 输出: [1, 1, 3, 4, 5]
print(numbers)         # 输出: [3, 1, 4, 1, 5] (原列表不变)

# reverse()
numbers = [1, 2, 3, 4, 5]
numbers.reverse()
print(numbers)  # 输出: [5, 4, 3, 2, 1]

5.3 其他方法

  • copy():创建列表的浅拷贝

  • copy() vs 切片拷贝:两种创建浅拷贝的方法

# copy()
original = [1, 2, 3, [4, 5]]
copy = original.copy()
print(copy)  # 输出: [1, 2, 3, [4, 5]]

# 修改原列表的嵌套列表
original[3][0] = 99
print(original)  # 输出: [1, 2, 3, [99, 5]]
print(copy)      # 输出: [1, 2, 3, [99, 5]] (浅拷贝,嵌套对象共享)

# 切片拷贝
original = [1, 2, 3]
copy = original[:]
print(copy)  # 输出: [1, 2, 3]

六、列表的高级特性

6.1 列表推导式

列表推导式是一种简洁创建列表的方法:

# 基本语法: [expression for item in iterable if condition]

# 示例1: 创建平方列表
squares = [x**2 for x in range(10)]
print(squares)  # 输出: [0, 1, 4, 9, 16, 25, 36, 49, 64, 81]

# 示例2: 带条件的列表推导式
even_squares = [x**2 for x in range(10) if x % 2 == 0]
print(even_squares)  # 输出: [0, 4, 16, 36, 64]

# 示例3: 嵌套列表推导式
matrix = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
flattened = [num for row in matrix for num in row]
print(flattened)  # 输出: [1, 2, 3, 4, 5, 6, 7, 8, 9]

# 示例4: 复杂表达式
fruits = ["apple", "banana", "cherry"]
uppercase_fruits = [fruit.upper() for fruit in fruits]
print(uppercase_fruits)  # 输出: ["APPLE", "BANANA", "CHERRY"]

6.2 列表与函数

  • map():对列表中的每个元素应用函数

  • filter():过滤列表中的元素

  • reduce():对列表中的元素进行累积操作

# map()
numbers = [1, 2, 3, 4, 5]
squared = list(map(lambda x: x**2, numbers))
print(squared)  # 输出: [1, 4, 9, 16, 25]

# filter()
numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
even = list(filter(lambda x: x % 2 == 0, numbers))
print(even)  # 输出: [2, 4, 6, 8, 10]

# reduce()
from functools import reduce
numbers = [1, 2, 3, 4, 5]
sum = reduce(lambda x, y: x + y, numbers)
print(sum)  # 输出: 15

6.3 列表的深浅拷贝

  • 浅拷贝:只复制列表的顶层元素,嵌套对象共享

  • 深拷贝:递归复制所有元素,包括嵌套对象

import copy

# 浅拷贝
original = [1, 2, 3, [4, 5]]
shallow = copy.copy(original)
original[3][0] = 99
print(original)  # 输出: [1, 2, 3, [99, 5]]
print(shallow)   # 输出: [1, 2, 3, [99, 5]] (嵌套列表被修改)

# 深拷贝
original = [1, 2, 3, [4, 5]]
deep = copy.deepcopy(original)
original[3][0] = 99
print(original)  # 输出: [1, 2, 3, [99, 5]]
print(deep)      # 输出: [1, 2, 3, [4, 5]] (嵌套列表未被修改)

6.4 列表的迭代

  • for 循环:遍历列表元素

  • enumerate():同时获取索引和值

  • zip():同时遍历多个列表

# for 循环
fruits = ["apple", "banana", "cherry"]
for fruit in fruits:
    print(fruit)

# enumerate()
for index, fruit in enumerate(fruits):
    print(f"Index {index}: {fruit}")

# zip()
names = ["Alice", "Bob", "Charlie"]
ages = [25, 30, 35]
for name, age in zip(names, ages):
    print(f"{name} is {age} years old")

七、列表的性能优化

7.1 列表操作的时间复杂度

操作时间复杂度说明
索引访问O(1)常数时间
索引修改O(1)常数时间
列表长度O(1)常数时间
append()O(1)平均常数时间
pop() (末尾)O(1)常数时间
pop(i) (中间)O(n)线性时间,需要移动元素
insert()O(n)线性时间,需要移动元素
remove()O(n)线性时间,需要查找和移动元素
sort()O(n log n)对数线性时间
in 操作O(n)线性时间,需要遍历查找

7.2 性能优化技巧

  • 预分配列表大小:如果知道列表最终大小,使用 [None] * size 预分配

  • 使用列表推导式:比传统循环更高效

  • 避免频繁插入/删除中间元素:考虑使用 collections.deque 对于频繁的中间插入/删除

  • 使用生成器:对于大型数据集,使用生成器表达式减少内存使用

  • 选择合适的方法:根据操作的时间复杂度选择合适的方法

# 预分配列表
size = 1000000
# 低效
lst = []
for i in range(size):
    lst.append(i)

# 高效
lst = [None] * size
for i in range(size):
    lst[i] = i

# 生成器表达式 (内存更高效)
gen = (x**2 for x in range(1000000))
# 转换为列表时才会计算
lst = list(gen)

7.3 内存优化

  • 列表压缩:对于大型列表,考虑使用更紧凑的数据结构

  • 垃圾回收:及时删除不再需要的列表引用

  • 使用适当的数据类型:对于特定类型的数据,使用更高效的类型(如 array 模块)

# 使用 array 模块存储同类型数据
import array
# 存储整数,比列表更节省内存
int_array = array.array('i', [1, 2, 3, 4, 5])

八、列表的实际应用

8.1 数据存储和处理

# 存储学生信息
students = [
    {"name": "Alice", "age": 25, "grade": "A"},
    {"name": "Bob", "age": 22, "grade": "B"},
    {"name": "Charlie", "age": 23, "grade": "A"}
]

# 按年龄排序
students.sort(key=lambda x: x["age"])
print(students)

# 过滤出成绩为 A 的学生
a_students = [student for student in students if student["grade"] == "A"]
print(a_students)

8.2 算法实现

# 实现冒泡排序
def bubble_sort(lst):
    n = len(lst)
    for i in range(n):
        for j in range(0, n-i-1):
            if lst[j] > lst[j+1]:
 lst[j], lst[j+1] = lst[j+1], lst[j]
    return lst

numbers = [64, 34, 25, 12, 22, 11, 90]
sorted_numbers = bubble_sort(numbers)
print(sorted_numbers)  # 输出: [11, 12, 22, 25, 34, 64, 90]

8.3 矩阵操作

# 创建和操作矩阵
matrix = [
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9]
]

# 访问元素
print(matrix[1][1])  # 输出: 5

# 转置矩阵
transposed = [[row[i] for row in matrix] for i in range(len(matrix[0]))]
print(transposed)  # 输出: [[1, 4, 7], [2, 5, 8], [3, 6, 9]]

# 矩阵加法
matrix1 = [[1, 2], [3, 4]]
matrix2 = [[5, 6], [7, 8]]
result = [[matrix1[i][j] + matrix2[i][j] for j in range(len(matrix1[0]))] for i in range(len(matrix1))]
print(result)  # 输出: [[6, 8], [10, 12]]

8.4 字符串处理

# 处理字符串列表
words = ["apple", "banana", "cherry", "date", "elderberry"]

# 按长度排序
words.sort(key=len)
print(words)  # 输出: ["date", "apple", "banana", "cherry", "elderberry"]

# 过滤出长度大于 5 的单词
long_words = [word for word in words if len(word) > 5]
print(long_words)  # 输出: ["banana", "cherry", "elderberry"]

# 生成首字母大写的单词列表
capitalized = [word.capitalize() for word in words]
print(capitalized)  # 输出: ["Date", "Apple", "Banana", "Cherry", "Elderberry"]

九、总结

Python 列表是一种功能强大、灵活多变的数据结构,是 Python 编程中最常用的工具之一。本教程涵盖了列表的基本概念、操作、方法、高级特性、性能优化和实际应用等方面。

通过学习本教程,你应该已经掌握了 Python 列表的核心知识点,包括:

  • 列表的定义和基本特性

  • 列表的访问和切片操作

  • 列表的基本操作(拼接、重复、长度等)

  • 列表的修改操作(添加、删除、修改元素)

  • 列表的各种方法(查找、排序、反转等)

  • 列表的高级特性(列表推导式、函数式编程、深浅拷贝)

  • 列表的性能优化技巧

  • 列表的实际应用场景

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  1. CONNECT:[ UseTime:0.000955s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001460s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.011284s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.012127s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001712s ]
  6. SELECT * FROM `set` [ RunTime:0.015776s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001825s ]
  8. SELECT * FROM `article` WHERE `id` = 509678 LIMIT 1 [ RunTime:0.021090s ]
  9. UPDATE `article` SET `lasttime` = 1787294151 WHERE `id` = 509678 [ RunTime:0.026504s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.018134s ]
  11. SELECT * FROM `article` WHERE `id` < 509678 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.009471s ]
  12. SELECT * FROM `article` WHERE `id` > 509678 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.005070s ]
  13. SELECT * FROM `article` WHERE `id` < 509678 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.029132s ]
  14. SELECT * FROM `article` WHERE `id` < 509678 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.007302s ]
  15. SELECT * FROM `article` WHERE `id` < 509678 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004421s ]
0.346644s