python如何将字符串等长分割

#!/bin/python

#site:WWW.jb51.net

#

A = open('mac.txt','r')

a = A.readlines()

for aa in a:

 b = list(aa.strip())

 c=''

 for i in range(len(b)):

  if i !=0:

   if i%2 == 0:

    c=c+'-'+b[i]

   else:

    c=c+b[i]

  else:

   c=c+b[i]

 print c

A.close()

#!/bin/python

#

import re

A = open('mac.txt','r')

a = A.readlines()

for aa in a:

 b=re.findall(r'.{2}',aa)

 c='-'.join(b)

 print c

A.close()

def cut_text(text,lenth):

 textArr = re.findall('.{'+str(lenth)+'}', text)

 textArr.append(text[(len(textArr)*lenth):])

 return textArr

print(cut_text('123456789abcdefg',3))

['123', '456', '789', 'abc', 'def', 'g']

>>> import re

>>> string = '123456789abcdefg'

>>> re.findall(r'.{3}', string)

['123', '456', '789', 'abc', 'def']

>>>