pythonはコンテンツを分岐出力する

a="aA1 bB2 cC3 dD4 eE5 fF6 gG7 hH8 iI9 "
"""
     :
abcdefghi
ABCDEFGHI
123456789
         
"""
 
print("   :===============")
for r in range(0,4):
 t=''
 for s in range(0+r,len(a),4):
  t=t+a[s]
 print(t)
 
print("   :===============")
 
#=_=             ?
l=list(a)
ta=tb=tc=td=''
for r in range(0,9):
 for s in range(0,4):
  if s==0:
   ta=ta+l.pop(0)
  if s==1:
   tb=tb+l.pop(0)
  if s==2:
   tc=tc+l.pop(0)
  if s==3:
   td=td+l.pop(0)
print(ta)
print(tb)
print(tc)
print(td)
  
print("  3:   N   ===============")
import string
ta=tb=tc=td=''
la=string.ascii_lowercase
ua=string.ascii_uppercase
nb=string.digits
ub="         "
for s in a:
 if s in la:
  ta=ta+s
 if s in ua:
  tb=tb+s
 if s in nb:
  tc=tc+s
 if s in ub:
  td=td+s
print(ta)
print(tb)
print(tc)
print(td)
 
print("  4:            ===============")
import re
#          ,        
reg=["[a-z]","[A-Z]","\d","[^\da-zA-Z]"]
for s in reg: 
 rega=re.compile(s)
 s=re.findall(rega,a)
 print("".join(s))
 
"""
  :
   :===============
abcdefghi
ABCDEFGHI
123456789
         
   :===============
abcdefghi
ABCDEFGHI
123456789
         
  3:   N   ===============
abcdefghi
ABCDEFGHI
123456789
         
  4:            ===============
abcdefghi
ABCDEFGHI
123456789
         
"""

f=open("shuju.txt","r")
content=f.read()
print content
for i in content:
  print i
f.close()
f=open('shuju.txt','w')
f.write(content)
f.close()