Python的17个骚操作，你都OK吗？

客官°小女子只卖身不卖艺 2023-05-31 12:03 1阅读 0赞

## Python 是一门非常优美的语言，其简洁易用令人不得不感概人生苦短。在本文中，我将带大家回顾了17 个非常有用的 Python 技巧，例如查找、分割和合并列表等。这 17 个技巧都非常简单，但它们都很常用且能激发不一样的思路。 ##

### 1.交换变量值 ###

#交换变量值
    a, b = 5, 10
    print(a, b)
    a, b = b, a
    print(a, b)

### 2.将列表中的所有元素组合成字符串 ###

a = ['Python ','is',' awesome']
    b =''.join(a)
    print(b)

### 3.查找列表中频率最高的值 ###

'''most frequent element in a list'''
    a = [1,2,3,1,2,3,2,2,4,5,1]
    print(max(set(a),key = a.count))
    '''using Counter from collections'''
    from collections import Counter
    cnt = Counter(a)
    print(cnt.most_common(3))

### 4.检查两个字符串是不是由相同的字母不同顺序组成 ###

from collections import Counter
    str1 = "abcdef"
    str2 = "afbecd"
    print(Counter(str1) == Counter(str2))

### 5.反转字符串 ###

'''reversinig string with special case of slice step param'''
    a = 'abcdefghigklmnopqrstuvwxyz'
    print(a[::-1])
    '''itering over string contens in reverse efficiently'''
    for char in reversed(a):
        print(char)
    '''reversing an integer through type conversion and slicing'''
    num = 123456789
    print(int(str(num)[::-1]))
    
    #反转列表
    '''reversinig list with special case of slice step param'''
    a = [5,4,3,2,1]
    print(a[::-1])
    '''itering over list contens in reverse efficiently'''
    for ele in reversed(a):
        print(ele)

### 6.反转列表 ###

'''reversinig list with special case of slice step param'''
    a = [5,4,3,2,1]
    print(a[::-1])
    '''itering over list contens in reverse efficiently'''
    for ele in reversed(a):
        print(ele)

### 7.转置二维数组 ###

original = [['a','b'],['c','d'],['e','f']]
    transposed = zip(*original)
    print(list(transposed))

### 8.链式比较 ###

b = 6  
print(4 < b < 7)  
print(1 == b <20)

### 9.链式函数调用 ###

def product(a,b):
        return a * b
    def add(a,b):
        return a + b
    b= True
    print((product if b else add)(5,7))

### 10.字典get方法 ###

d = {'a':1,'b':2}
    print(d)
    print(d.get('a'))
    print(d.get(1))

### 11.通过【键】排序字典元素 ###

#通过【键】排序字典元素
    d = {'apple':18,'orange':20,'banana':5,'rotten tomato':1}
    print(sorted(d.items(),key=lambda x:x[1]))
    
    from operator import itemgetter
    print(sorted(d.items(),key=itemgetter(1)))
    
    print(sorted(d, key=d.get))

### 12.For Else ###

a = [1,2,3,4,5]
    for el in a:
        if el == 0:
            break
    else:
        print('did not break out of for loop')

### 13.转换列表为逗号分隔格式 ###

items = ['foo','bar','xyz']
    print(','.join(items))
    
    numbers = [2,3,5,10]
    print(','.join(map(str,numbers)))
    
    data = [2,'hello',3,3.4]
    print(','.join(map(str,data)))

### 14.合并字典 ###

d1 = {'a':1}
    d2 = {'b':2}
    print({**d1,**d2})
    
    print(dict(d1.items() | d2.items()))
    
    d1.update(d2)
    print(d1)

### 15.列表中最小和最大值的索引 ###

lst = [40,10,20,30]
    def minIndex(lst):
        return min(range(len(lst)),key = lst.__getitem__)
    def maxIndex(lst):
        return max(range(len(lst)),key = lst.__getitem__)
    
    print(minIndex(lst))
    print(maxIndex(lst))

### 16.移除列表中的重复元素 ###

items = [2,2,3,3,1]
    newitems2 = list(set(items))
    print(newitems2)
    
    from collections import OrderedDict
    items = ["foo","bar","bar","foo"]
    print(list(OrderedDict.fromkeys(items).keys()))

### 17..复制列表 ###

a = [1,2,3,4,5]
    print(list(a))
    
    a = [1,2,3,4,5]
    print(a.copy())
    
    a = [1,2,3,4,5]
    b = a
    b[0] = 10
    print(a)
    print(b)
    
    a = [1,2,3,4,5]
    b = a[:]
    b[0] = 10
    print(a)
    print(b)
    
    from copy import deepcopy
    l = [[1,2],[3,4]]
    l2 = deepcopy(l)
    print(l2)

## 快快收藏起来吧，相信你在实践中一定会遇到这17个非常有用的功能！！！ ##