[Python] Counting the number of lines in a gzip file using python

I'm trying to count the number of lines in a gz archive. There is only 1 json format text file per gz. But when I open the archive and count the lines the count is way off what I'd expect. The file contains 522 lines, but my code is returning 668480 lines.

import gzip
f = gzip.open(myfile, 'rb')
file_content = f.read()
for i, l in enumerate(file_content):
pass
i += 1
print("File {1} contain {0} lines".format(i, myfile))

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