Python小知识

列表解析

from random import randint

data =[randint(-10,10) for _ in range(10)]

1.[x for x in data if x >0]  列表解析

2.filter(lambda x:x>0,data)

3.res =[]

   for x in data:

      if x>0:

          res.append(x)

 

1速度最快，2其次，3不好

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字典解析

from random import randint

d ={x:randint(60,100) for x in range(1,21)}

{k:v for k,v in d.items() if v >90}    字典解析

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集合解析

s= [randint(-10,10) for _ in range(10)]
t = set(s)

{x for x in t if x%3 ==0}  

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from collections import namedtuple

student = namedtuple('Student',['name','age','sex','emil'])
a = student('jim',16,'man','ssss@163.com')
print(a.name)

 

 

 

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