在学习Python的过程中,你总会发现Python可以轻松解决很多问题。一些复杂的任务甚至可以用一行 Python 代码完成。
这里有25个有趣的Python代码,个个都很实用。我希望你能发现它们很有用。
1.字母字谜
如果两个单词包含相同的字母并且顺序不同,则它们被称为变位词。例如,“silent”和“listen”是字母变位词,而“apple”和“aplee”则不是。
from collections import Counter
s1 = 'below'
s2 = 'elbow'
print('anagram') if Counter(s1) == Counter(s2) else print('not an anagram')
2.二进制转十进制
decimal = int('1010', 2)
print(decimal) #10
3. 将字符串转为小写
print("Hi my name is Jack Chen".lower())
# 'hi my name is Jack Chen'
print("Hi my name is Jack Chen".casefold())
# 'hi my name is Jack Chen'
4. 将字符串转为大写
print("hi my name is Jack Chen".upper())
# 'HI MY NAME IS Jack Chen'
5. 将字符串转换为字节
print("convert string to bytes using encode method".encode())
# b'convert string to bytes using encode method'
6.复制文件
import shutil
shutil.copyfile('source.txt', 'dest.txt')
7. 快速排序
qsort = lambda l: l if len(l) <= 1 else qsort([x for x in l[1:] if x < l[0]]) + [l[0]] + qsort([x for x在 l[1:] if x >= l[0]])
print(qsort([17, 29, 11, 97, 103, 5]))
# [5, 11, 17, 29, 97, 103]
8. N 个数之和
n = 10
打印((λ x: (x*(x+1))/2)(n)
# 55
9. 切换两个变量的值
a, b = b, a
10.斐波那契
fib = lambda x: x if x<=1 else fib(x-1) + fib(x-2)
print(fib(20))
# 6765
11. 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]
12. 运行 HTTP 服务器
python3 -m http.server 8000
python2 -m SimpleHTTPServer
13.反转列表
numbers = [0, 1, 2, 11, 12, 13, 52, 53, 54]
print(numbers[::-1])
# [54, 53, 52, 13, 12, 11, 2, 1, 0 ]
14.阶乘
import math
fact_5 = math.factorial(5)
print(fact_5)
# 120
15. 在列表理解中使用 for 和 if
even_list = [number for number in [1, 2, 3, 4] if number % 2 == 0]
print(even_list)
# [2, 4]
16. 列表中最长的字符串
words = [‘This’, ‘is’, ‘a’, ‘list’, ‘of’, ‘words’]
result = max(words, key=len)
print(result)
# ‘words’
17.列表理解
li = [num for num in range(0, 10)]
print(li)
# [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
18.集合理解
num_set = {num for num in range(0, 10)}
print(num_set)
# {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}
19. 字典理解
dict_numbers = {x: x*x for x in range(1, 5)}
print(dict_numbers)
# {1: 1, 2: 4, 3: 9, 4: 16}
21. 用 if 和 else 打印
print("even") if 4 % 2==0 else print("odd")
22.无限循环
while 1:0
23. 检查数据类型
print(isinstance(2, int))
# True
print(isinstance("allwin", str))
# True
print(isinstance([3, 4, 1997], list))
# True
24.打印到文件
print("Hello, World!", file=open('file.txt', 'w'))
25. 字符串中字符的出现频率
print("umbrella".count('l'))
# 2
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