In this article, 20 Python code snippets will be shared to help you meet your daily programming challenges. You may already know some of these pieces, but some others may be new to you. Immediately improve your programming skills with these useful Python code snippets.
1. Simple HTTP web server
# 简单的 HTTP 服务器
import socketserver
import http.serverPORT = 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/
2. Single-line loop List
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]
3. Update the dictionary
# 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'}
4. Split multi-line string
# 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']
5. Track the frequency of elements in a list
# 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}
6. Read CSV files without Pandas
# 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']
7. Compress the list into a string
# 压缩字符串列表
mylist = ["I learn", "Python", "JavaScript", "Dart"]
string = " ".join(mylist)
print(string) # I learn Python JavaScript Dart
8. Get the index of the element in the list
# 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)) # 49. The magic of *arg
# *arg 的魔法
def func(*arg):
num = 0
for x in arg:
num = num + x
print(num) # 600
func(100, 200, 300)
10. Get the type of any data
# 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'>
11. Modify the print function
# 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#”
12. String de-capitalization
# 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
13. Shortcut variable exchange method
# 快速交换变量的方法
d1 = 25
d2 = 50
d1, d2 = d2, d1
print(d1, d2) # 50 25
14. Print with delimiter
# 带分隔符打印
print("Py", "Js", "C#", sep="-") # Py-Js-C#
print("100", "200", "300", sep="x") # 100x200x300
15. Get the HTML data of the web page
# 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
16. Obtaining data takes up memory
# 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
17. Simple class creation
# 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)
18. String Multiplier
# 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#
19. Chained comparisons
# 链式比较
a = 5
print(1 == a < 2) # False
print(2 < 3 < 6 > a) # True
20. Digitizing Integer Values
# 数字化
integer = 234553
digitz = [int(i) for i in str(integer)]
print(digitz) # [2, 3, 4, 5, 5, 3]