python 导出函数

[root@node01 python]# pwd
/root/python


[root@node01 python]# cat lib/pycharm/myutils.py
def scanner(a,b):
    for line in a:
        b(line)


[root@node01 python]# cat a4.py 
from lib.pycharm.myutils import *
f=open('/etc/passwd','r')
def linehandler(x):
   print len(x)
print scanner(f,linehandler)
[root@node01 python]# python a4.py 
32
33
40
37
41
32
45
33
47
48
45
46
48
44
38
48
61
60
40
60
70
45
36
69
50
67
33
90
35
35
48
70
80
40
41
37
68
45
40
36
None