一行python代码能干嘛？

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原创最新推荐文章于 2026-05-02 10:06:13 发布 752 阅读 AI 写同款· GEO 优化 ›

Verilog流水线CPU设计（超详细）快把这一篇给更了阅读详情

最近在网上看到一篇文章讲的是一行Python代码能干嘛，有点意思，我分享给大家：

▍1、**斐波纳契数列

fib = lambda x: x if x<=1 else fib(x-1) + fib(x-2)

print(fib(20))
# 6765

▍2、**将嵌套列表合并为一个列表

main_list = [[0, 1, 2], [11, 12, 13], [52, 53, 54]]

result = [item for sublist in main_list for item in sublist]
print(result)

>
[0, 1, 2, 11, 12, 13, 52, 53, 54]

▍3、阶乘**

import math

fact_5 = math.factorial(5)
print(fact_5)
# 120

▍4、**在列表推导式中使用for和if

even_list = [number for number in [1, 2, 3, 4] if number % 2 == 0]

print(even_list)
# [2, 4]

▍5、列表中最长的字符串**

words = ['This', 'is', 'a', 'list', 'of', 'words']

result = max(words, key=len)
print(result)
# 'words'

▍6、**列表推导式

li = [num for num in range(0, 10)]

print(li)
# [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

▍7、集合推导式**

num_set = {num for num in range(0, 10)}

print(num_set)
# {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}

▍8、字典推导式**

dict_numbers = {x: x*x for x in range(1, 5)}

print(dict_numbers)
# {1: 1, 2: 4, 3: 9, 4: 16}

▍9、检查数据类型**

print(isinstance(2, int))
# True

print(isinstance("allwin", str))
# True

print(isinstance([3, 4, 1997], list))
# True

▍10、**使用print语句写入文件

print("Hello, World!", file=open('file.txt', 'w'))

既可打印出信息，还能将信息保存文件。

▍11、**计算一个字符在字符串中出现的频率

print("umbrella".count('l'))
# 2

▍12、时间戳**

import time

print(time.time())

▍13、列表中出现次数最多的元素**

test_list = [9, 4, 5, 4, 4, 5, 9, 5, 4]
most_frequent_element = max(set(test_list), key=test_list.count)

print(most_frequent_element)
# 4

▍14、**将键值对转换为字典

result = dict(name='XiaoF', age=23)

print(result)
# {'name': 'XiaoF', 'age': 23}

▍15、**求商和余数

quotient, remainder = divmod(4, 5)

print(quotient, remainder)
# 0 4

divmod()函数返回当参数1除以参数2时，包含商和余数的元组。

▍16、打印九九乘法表**

print '\n'.join([' '.join(['%s*%s=%-2s' % (y,x,x*y) for y in range(1,x+1)]) 
for x in range(1,10)])

▍17、删除列表中的重复项**

print(list(set([4, 4, 5, 5, 6])))
# [4, 5, 6]

▍18、获取小写字母表**

import string

print(string.ascii_lowercase)
# abcdefghijklmnopqrstuvwxyz

▍19、**获取大写字母表

import string

print(string.ascii_uppercase)
# ABCDEFGHIJKLMNOPQRSTUVWXYZ

▍20、获取0到9字符串**

import string

print(string.digits)
# 0123456789

▍21、**十六进制转十进制

print(int('da9', 16))
# 3497

▍22、日期时间**

import time

print(time.ctime())
# Thu Aug 13 20:00:00 2021

▍23、将列表中的字符串转换为整数**

print(list(map(int, ['1', '2', '3'])))
# [1, 2, 3]

▍24、**用键对字典进行排序

d = {'one': 1, 'four': 4, 'eight': 8}
result = {key: d[key] for key in sorted(d.keys())}

print(result)
# {'eight': 8, 'four': 4, 'one': 1}

▍25、用键值对字典进行排序**

x = {1: 2, 3: 4, 4: 3, 2: 1, 0: 0}
result = {k: v for k, v in sorted(x.items(), key=lambda item: item[1])}

print(result)
# {0: 0, 2: 1, 1: 2, 4: 3, 3: 4}

▍26、列表旋转**

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

# li[n:] + li[:n], 右变左
print(li[2:] + li[:2])
# [3, 4, 5, 1, 2]

# li[-n:] + li[:-n], 左变右
print(li[-1:] + li[:-1])
# [5, 1, 2, 3, 4]

▍27、将字符串中的数字移除**

message = ''.join(list(filter(lambda x: x.isalpha(), 'abc123def4fg56vcg2')))

print(message)
# abcdeffgvcg

▍28、矩阵变换**

old_list = [[1, 2, 3], [3, 4, 6], [5, 6, 7]]
result = list(list(x) for x in zip(*old_list))

print(result)
# [[1, 3, 5], [2, 4, 6], [3, 6, 7]]

▍29、列表过滤**

result = list(filter(lambda x: x % 2 == 0, [1, 2, 3, 4, 5, 6]))

print(result)
# [2, 4, 6]

▍30、解包**

a, *b, c = [1, 2, 3, 4, 5]

print(a) # 1
print(b) # [2, 3, 4]
print(c) # 5

▍31、打印一个心星

print'\n'.join([''.join([('HiPython'[(x-y)%len('HiPython')]
if((x*0.05)**2+(y*0.1)**2-1)**3-(x*0.05)**2*(y*0.1)**3<=0 else' ')
for x in range(-32,32)])for y in range(17,-17,-1)]) >>