[Python] Why the following code in python is failing to write 10L items of list into a file?...

em1 = {chr(random.randrange(65,122))+
chr(random.randrange(65,122))+
chr(random.randrange(65,122))+
chr(random.randrange(65,122))+
random.choice(['@gmail.com','@yahoo.co.in','@hotmail.com','rediffmail.com'])
for _ in range(1000000)}

with open('emails.txt','w') as fp:
i = 0
for x in em1:
fp.write(str(i)+': ' + str(x) +'\n')
i = i+1


Last 3 lines in the file

988242: NHhF@gmail.com

988243: WusOrediffmail.com

988244: _BlI@gmail.com

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