By default all the quantifiers are greedy in nature. In the sense, they will try to consume as much string as they can. You can make them reluctant by appending a ? after them:
find = re.compile(r"^(.*?)\..*")
As noted in comment, this approach would fail if there is no period in your string. So, it depends upon how you want it to behave. But if you want to get the complete string in that case, then you can use a negated character class:
find = re.compile(r"^([^.]*).*")
it will automatically stop after encountering the first period, or at the end of the string.
Also you don’t want to use re.match() there. re.search() should be just fine. You can modify your code to:
find = re.compile(r"^[^.]*")
for l in lines:
print re.search(find, l).group(0)
Demo on ideone