Python map及filter函数使用方法解析

def double(x):
  return 2*x
if __name__=="__main__":
  print(map(double,[1,2,3,4,5]))
  print()
  for i in map(double,[1,2,3,4,5]):
    print(i)

F:\dev\python\python.exe F:/pyCharm/L02_Test/L02Interface/L02_Common/try_demo.py
<map object at 0x000002A3D91A3EF0>
 
2
4
6
8
10
 
Process finished with exit code 0

def is_odd(x):
  return x%2==0
 
if __name__=="__main__":
  print(filter(is_odd,[1,2,3,4,5,6,7,8,9,10]))
  print()
  for i in filter(is_odd,[1,2,3,4,5,6,7,8,9,10]):
    print(i)

F:\dev\python\python.exe F:/pyCharm/L02_Test/L02Interface/L02_Common/try_demo.py
<filter object at 0x000001C75D243FD0>
 
2
4
6
8
10
 
Process finished with exit code 0