python实现将内容分行输出

a="aA1一bB2二cC3三dD4四eE5五fF6六gG7七hH8八iI9九""""分行输出为:abcdefghiABCDEFGHI123456789一二三四五六七八九""" print("方法一:===============")for r in range(0,4): t='' for s in range(0+r,len(a),4):  t=t+a[s] print(t) print("方法二:===============") #=_=这个方法会不会看起来比较傻?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("方法3:回字有N种写法===============")import stringta=tb=tc=td=''la=string.ascii_lowercaseua=string.ascii_uppercasenb=string.digitsub="一二三四五六七八九"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+sprint(ta)print(tb)print(tc)print(td) print("方法4:回字有一种叫做正则的写法===============")import re#这正则写法感觉不科学,暂时没有好的想法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)) """输出:方法一:===============abcdefghiABCDEFGHI123456789一二三四五六七八九方法二:===============abcdefghiABCDEFGHI123456789一二三四五六七八九方法3:回字有N种写法===============abcdefghiABCDEFGHI123456789一二三四五六七八九方法4:回字有一种叫做正则的写法===============abcdefghiABCDEFGHI123456789一二三四五六七八九"""

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