Write lines up to matched string in python

Question

I've the input file as :

Input file:

HEAD    xxxxxxx xxxx
;;;;;;;;;;;;;;;;              
..................
;;;;;;;;;;;;;
..............                                                                    

MODEL        1 

ENDMDL      
;;;;;;;;;;;;;;;;              
..................
;;;;;;;;;;;;;

MODEL        2

ENDMDL  

;;;;;;;;;;;;;;;;              
..................
;;;;;;;;;;;;;
..............

MODEL        3

ENDMDL 

Would like to match string “MODEL 2” and print only above lines Desired output:

HEAD    xxxxxxx xxxx
;;;;;;;;;;;;;;;;              
..................
;;;;;;;;;;;;;
..............                                                                    

MODEL        1 

ENDMDL 

Also I would prefer to read a file and write it in same file.

Answer 1

I found myself this one does what i want.

def transp(inputt):
    with open(inputt,'r+') as f:
        f.write(f.read().split("ENDMDL")[0])