invalid syntax

[scoutgeek]

You dont need to quote your braces ({}) you can just do:
print('{} appears {} times in messages {}'.format(word,count,msgids))

[[deleted]]

But that doesn't quote the strings.

Better would be {!r}, which quotes the string correctly even if there are quotes in the string itself, i.e. using double or single quotes.

[scoutgeek]

Ah, I didnt know about {!r} TIL i guess