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

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

集合解析
s= [randint(-10,10) for _ in range(10)]
t = set(s)
{x for x in t if x%3 ==0}  



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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