Python Check txt variable loop -

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i need function check in name.txt variable if variable changed print 1 , again if variable 2 times change again print 1. possible in python?http://pastebin.com/qa0ed3nm

fr = open("plik.txt",'r')
first_length = len(str(fr.read()))
while true:
text = str(fr.read())
if(len(text)!=first_length):
fr.close()
fw = open("plik.txt","w")
fw.write(text)
fw.close()
print("done")
break;

may function can help:

def checkchange(filename, oldcontent):     fsrc = open(filename, 'r')     actualcontent = fsrc.read()     fsrc.close()     if actualcontent != oldcontent:         print(1)     return actualcontent

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