line replacement help

[mdalireza]

Hi,
I have wrote and trying to implement the code. I want to replace the whole lline containing anything like mov9, inp9 etc.

filename = 'myfile.txt'

with open(filename, 'r') as f:
  text = f.read()

text = text.replace('mov9=', 'mov9=this is')
text = text.replace('inp9=go', 'nom')
text = text.replace('nin9', 'ten9=pop')


with open(filename, 'w') as f:
  f.write(text)

when I run the code..I got the output like 'mov9=this is' first time. But second time I got like' mov9=this is this is'. I just want to replace the whole line containing move9 or inp9 everytime.

Please help me.