在python类中传递的字符串

Question

My input string from a file is 

 ANG 
    0.0
    0.0
    0.0
    0.0
    0.0
    0.0
    0.0
    0.0 
My required output should be  
ANG 
    0.0
    0.0
    0.0
    0.0
    0.0
    0.0 
    100
    0.3

但是现在我的输入与输出相同。ANG字符串下的最后两个零将分别替换为100.0和0.3。请帮助我获取所需的输出。

    import re
class Calculate:
   def angCal(self,direction,magnitude,string):
    cnt=0
      if cnt<=6:
        f4.write(string)
        cnt+=1
      elif cnt==7:
        string=str(direction)+"\n"
        f4.write(string)
        cnt += 1
      elif cnt==8:
        string = str(magnitude) + "\n"
        f4.write(string)
        cnt += 1
    elif cnt==9:
        cnt += 1
        angFlag=0
        angcnt=0
  f1=open("nominal.txt","r")
  f4=open("pp.txt","w")
  obj=Calculate()
for line in f1.readlines():
  string=line
  if re.match(r'ANG',string):
    angFlag=1
    f4.write(string)
elif angFlag==1 and angcnt==0:

    direction=100
    magnitude=0.3
    print(string)
    obj.angCal(direction,magnitude,string)
    angFlag=0
    angcnt+=1
elif angFlag==1 and angcnt==1:
    direction=315
    magnitude=0.4
else:
    f4.write(string)

请帮助获取所需的输出。如何将一组字符串传递给函数。期待代码帮助