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18条好用的Python技巧,建议收藏

  • 2026-06-30 16:05:07
18条好用的Python技巧,建议收藏
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在这篇文章中,我们将讨论最常用的python技巧。大多数这些技巧都是我在日常工作中使用过的简单的Trick,我觉得好东西就是要拿出来和大家一起分享。
闲话少说,我们直接开始吧!:)

处理用户的多个输入

有时我们需要从用户那里获得多个输入,以便使用循环或任何迭代,一般的写法如下:
# bad practice码n1 = input("enter a number : ")n2 = input("enter a number : ")n2 = input("enter a number : ")print(n1, n2, n3)
但是更好的处理方法如下:
# good practicen1, n2, n3 = input("enter a number : ").split()print(n1, n2, n3)

处理多个条件语句

如果我们在代码中需要检查多个条件语句,此时我们可以使用 all() any() 函数来实现我们的目标。一般来说, 当我们有多个 and 条件时使用 all(),当我们有多个 or 条件时使用 any()。这种用法将使我们的代码更加清晰易读,可以方便我们在调试时不会遇到麻烦。
对于all()的一般例子如下:
size = "lg"color = "blue"price = 50# bad practiceif size == "lg" and color == "blue" and price < 100:    print("Yes, I want to but the product.")

更好的处理方法如下:

# good practiceconditions = [    size == "lg",    color == "blue",    price < 100,]if all(conditions):print("Yes, I want to but the product.")
对于any()的一般例子如下:
# bad practicesize = "lg"color = "blue"price = 50if size == "lg" or color == "blue" or price < 100:    print("Yes, I want to but the product.")
更好的处理方法如下:
# good practiceconditions = [    size == "lg",    color == "blue",    price < 100,]if any(conditions):print("Yes, I want to but the product.")

判断数字奇偶性

这很容易实现,我们从用户那里得到输入,将其转换为整数,检查 对数字2的求余操作,如果余数为零,则它是偶数。
print('odd'ifint(input('Enter a number: '))%2 else'even')

 交换变量

在Python中如果需要交换变量的值,我们无需定义临时变量来操作。我们一般使用如下代码来实现变量交换:
v1 = 100v2 = 200# bad practicetemp = v1v1 = v2v2 = temp
但是更好的处理方法如下:
v1 = 100v2 = 200# good practicev1, v2 = v2, v1

判断字符串是否为回文串

将字符串进行反转最简单的实现方式为 [::-1] ,代码如下:
print("John Deo"[::-1])

反转字符串

在Python中判断一个字符串是否为回文串,只需要使用语句
string.find(string[::-1])== 0 ,示例代码如下:
v1 = "madam"# is a palindrome stringv2 = "master"# is not a palindrome stringprint(v1.find(v1[::-1]) == 0) # Trueprint(v1.find(v2[::-1]) == 0) # False

尽量使用 Inline if statement

大多数情况下,我们在条件之后只有一个语句,因此使用Inline if statement 可以帮助我们编写更简洁的代码。举例如下,一般的写法为:
name = "ali"age = 22# bad practicesif name:print(name)if name and age > 18:print("user is verified")
但是更好的处理方法如下:
# a better approachprint(name if name else "")""" here you have to define the else condition too"""# good practice name and print(name)age > 18and name and print("user is verified")

 删除list中的重复元素

我们不需要遍历整个list列表来检查重复元素,我们可以简单地使用 set() 来删除重复元素,代码如下:
lst = [1, 2, 3, 4, 3, 4, 4, 5, 6, 3, 1, 6, 7, 9, 4, 0]print(lst)unique_lst = list(set(lst))print(unique_lst)

找到list中重复最多的元素

在Python中可以使用 max( ) 函数并传递 list.count 作为key,即可找出列表list中重复次数最多的元素,代码如下:
lst = [1234344563167940]most_repeated_item = max(lst, key=lst.count)print(most_repeated_item)

 list 生成式

Python中我最喜欢的功能就是list comprehensions , 这个特性可以使我们编写非常简洁功能强大的代码,而且这些代码读起来几乎像自然语言一样通俗易懂。举例如下:
numbers = [1,2,3,4,5,6,7]evens = [x for x in numbers if x % 2 is 0]odds = [y for y in numbers if y not in evens]cities = ['London''Dublin''Oslo']def visit(city):    print("Welcome to "+city)for city in cities:    visit(city)

使用*args传递多个参数

在Python中我们可以使用*args来向函数传递多个参数,举例如下:
def sum_of_squares(n1, n2)return n1**2 + n2**2print(sum_of_squares(2,3))# output: 13"""what ever if you want to pass, multiple args to the function as n number of args. so let's make it dynamic."""def sum_of_squares(*args):return sum([item**2 for item in args])# now you can pass as many parameters as you wantprint(sum_of_squares(234))print(sum_of_squares(23456))

在循环时处理下标

有时我们在工作中,想要获得循环中元素的下标,一般来说,比较优雅的写法如下:
lst = ["blue""lightblue""pink""orange""red"]for idx, item inenumerate(lst):print(idx, item)

拼接list中多个元素

在Python中一般使用Join() 函数来将list中所有元素拼接到一起,当然我们也可以在拼接的时候添加拼接符号,样例如下:
names = ["john""sara""jim""rock"]print(", ".join(names))

将两个字典进行合并

在Python中我们可以使用{**dict_name, **dict_name2, … }将多个字典进行合并,样例如下:
d1 = {"v1"22"v2"33}d2 = {"v2"44"v3"55}d3 = {**d1, **d2}print(d3)
结果如下:
{'v1'22'v2'44'v3'55}
使用两个list生成一个字典
在Python中,如果我们需要将两个列表中对应的元素组成字典,那么我们可以使用 zip 功能来方便地做到这一点。代码如下:
keys = ['a''b''c']vals = [123]zipped = dict(zip(keys, vals))

字典按照value进行排序

在Python中我们使用sorted()函数来按照字典的value来对其进行排序.代码如下:
d = {"v1"80,"v2"20,"v3"40,"v4"20,"v5"10,}sorted_d = dict(sorted(d.items(), key=lambda item: item[1]))print(sorted_d)
当然我们也可以使用itemgetter( )来替代上述 lambda函数,代码如下:
from operator import itemgettersorted_d = dict(sorted(d.items(), key=itemgetter(1)))
更进一步,我们也可以通过传递 reverse=True 对其进行降序排序:
sorted_d = dict(sorted(d.items(), key=itemgetter(1), reverse=True))
Pretty print
在Python中使用Print()函数,有时候的输出贼拉拉丑陋,此时我们使用pprint可以使输出更加美观,样例如下:
from pprint import pprintdata = {"name""john deo","age""22","address": {"contry""canada""state""an state of canada :)""address""street st.34 north 12"},"attr": {"verified"True"emialaddress"True},}print(data)pprint(data)
输出如下:
{'name''john deo''age''22''address': {'contry''canada''state''an state of canada :)''address''street st.34 north 12'}, 'attr': {'verified'True'emialaddress'True}}{'address': {'address''street st.34 north 12','contry''canada','state''an state of canada :)'},'age''22','attr': {'emialaddress'True'verified'True},'name''john deo'}
可见使用pprint函数可以让字典的输出更加容易阅读
反转列表
Python 中通常有两种反转列表的方法:切片或 reverse() 函数调用。这两种方法都可以反转列表,但需要注意的是内置函数 reverse() 会更改原始列表,而切片方法会创建一个新列表。
但是他们的表现呢?哪种方式更有效?让我们看一下下面的例子:
# 使用切片$ python -m timeit -1000000 -'import numpy as np' 'mylist=list(np.arange(0, 200))' 'mylist[::-1]'1000000 loops, best of 515.6 usec per loop# 使用reverse()$ python -m timeit -1000000 -'import numpy as np' 'mylist=list(np.arange(0, 200))' 'mylist.reverse()'1000000 loops, best of 510.7 usec per loop
这两种方法都可以反转列表,但需要注意的是内置函数 reverse() 会更改原始列表,而切片方法会创建一个新列表。
显然,内置函数 reverse() 比列表切片方法更快!

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  1. CONNECT:[ UseTime:0.000550s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000617s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.016014s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000633s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000747s ]
  6. SELECT * FROM `set` [ RunTime:0.004901s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000769s ]
  8. SELECT * FROM `article` WHERE `id` = 498970 LIMIT 1 [ RunTime:0.021084s ]
  9. UPDATE `article` SET `lasttime` = 1783032185 WHERE `id` = 498970 [ RunTime:0.005136s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.005104s ]
  11. SELECT * FROM `article` WHERE `id` < 498970 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.021832s ]
  12. SELECT * FROM `article` WHERE `id` > 498970 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.045497s ]
  13. SELECT * FROM `article` WHERE `id` < 498970 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.080161s ]
  14. SELECT * FROM `article` WHERE `id` < 498970 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.029898s ]
  15. SELECT * FROM `article` WHERE `id` < 498970 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.072443s ]
0.388001s