20 Useful Python Code Snippets for Everyday Programming Tasks

In this article, we share 20 Python code snippets to help you handle daily programming challenges. Some snippets may be familiar, while others might be new. Use these useful Python code snippets to improve your programming skills.

1. Simple HTTP Web Server

<code># 简单的 HTTP 服务器
import socketserver
import http.server
PORT = 8000
handler = http.server.SimpleHTTPRequestHandler
with socketserver.TCPServer("", PORT), handler as http:
    print("Server Launch at Localhost: " + str(PORT))
    http.serve_forever()
# 在浏览器中输入 http://127.0.0.1:8000/</code>

2. Single-line List Loop

<code>mylist = [10, 11, 12, 13, 14]
print([i * 2 for i in mylist])  # [20, 22, 24, 26, 28]
print([i * 5 for i in mylist])  # [50, 55, 60, 65, 70]</code>

3. Update Dictionary

<code># 更新字典
mydict = {1: "Python", 2: "JavaScript", 3: "Csharp"}
mydict.update({4: "Dart"})
print(mydict)  # {1: 'Python', 2: 'JavaScript', 3: 'Csharp', 4: 'Dart'}</code>

4. Split Multi-line String

<code># 拆分多行字符串
string = "Data \n is encrpted \n by Python"
print(string)
# Output
# Data
# is encrpted
# by Python
splited = string.split("\n")
print(splited)  # ['Data ', ' is encrpted ', ' by Python']</code>

5. Track List Element Frequency

<code># Track Frequency
import collections

def Track_Frequency(List):
    return dict(collections.Counter(List))

print(Track_Frequency([10, 10, 12, 12, 10, 13, 13, 14]))
# Output
# {10: 3, 12: 2, 13: 2, 14: 1}</code>

6. Read CSV Without Pandas

<code># 简单的类创建
import csv
with open("Test.csv", "r") as file:
    read = csv.reader(f)
    for r in read:
        print(row)
# 输出
# ['Sr', 'Name', 'Profession']
# ['1', '小猴子', '数据挖掘工程师']
# ['2', '云朵君', '算法工程师']</code>

7. Compress List into a String

<code># 压缩字符串列表
mylist = ["I learn", "Python", "JavaScript", "Dart"]
string = " ".join(mylist)
print(string)  # I learn Python JavaScript Dart</code>

8. Get Index of Elements in List

<code># 获取列表中元素的索引
mylist = [10, 11, 12, 13, 14]
print(mylist.index(10))  # 0
print(mylist.index(12))  # 2
print(mylist.index(14))  # 4</code>

9. *arg Magic

<code># *arg 的魔法
def func(*arg):
    num = 0
    for x in arg:
        num = num + x
    print(num)  # 600

func(100, 200, 300)</code>

10. Get Type of Any Data

<code># 获取任意数据的类型
data1 = 123
data2 = "Py"
data3 = 123.443
data4 = True
data5 = [1, 2]

print(type(data1))  # <class 'int'>
print(type(data2))  # <class 'str'>
print(type(data3))  # <class 'float'>
print(type(data4))  # <class 'bool'>
print(type(data5))  # <class 'list'></code>

11. Modify Print Function

<code># 修改打印函数
print("顶级编程语言是 %r, %r 和 %r" % ('Py', 'Js', 'C#'))
# 输出
# 顶级编程语言是“Py”、“Js”和“C#”</code>

12. String Lowercase

<code># 字符串的去大写
data1 = "ABCD"
data2 = "Py"
data3 = "Learn Coding"
print(data1.lower())  # abcd
print(data2.lower())  # py
print(data3.lower())  # learn coding</code>

13. Quick Variable Swap

<code># 快速交换变量的方法
d1 = 25
d2 = 50
d1, d2 = d2, d1
print(d1, d2)  # 50 25</code>

14. Print with Separator

<code># 带分隔符打印
print("Py", "Js", "C#", sep="-")  # Py-Js-C#
print("100", "200", "300", sep="x")  # 100x200x300</code>

15. Fetch Webpage HTML Data

<code># 使用 pip 安装请求的第一个安装请求导入请求
r = requests.get("https://www.baidu.com/s?wd=数据STUDIO ")
print(r)  # 显示整页html数据</code>

16. Get Data Memory Usage

<code># 获取数据占用的内存导入系统
import sys

def memory(data):
    return sys.getsizeof(data)

print(memory(100))  # 28
print(memory("Pythonnnnnnn"))  # 61</code>

17. Simple Class Creation

<code># 简单的类
class Employee:
    def __init__(self, empID):
        self.empID = empID
        self.name = "Haider"
        self.salary = 50000

    def getEmpData(self):
        return self.name, self.salary

emp = Employee(189345)
print(emp.getEmpData())  # ('Haider', 50000)</code>

18. String Multiplier

<code># 字符串乘数# 
# 正常方式 
for x in range(5):
    print("C#")
# 更好的方式
print("C# "*5)  # C# C# C# C# C#</code>

19. Chained Comparison

<code># 链式比较
a = 5
print(1 == a < 2)  # False
print(2 < 3 < 6 > a)  # True</code>

20. Digitize Integer Value

<code># 数字化
integer = 234553
digitz = [int(i) for i in str(integer)]
print(digitz)  # [2, 3, 4, 5, 5, 3]</code>