This can be put into one line in several ways. Without changing your code you could just remove the newline and indent:
with open('output.txt', 'w') as f:
for item in winapps.list_installed(): print(item, file=f)
Or just using unpacking and print formatting:
with open('output.txt', 'w') as f:
print(*winapps.list_installed(), sep="\n", file=f)
Which can also be done in one line:
with open('output.txt', 'w') as f: print(*winapps.list_installed(), sep="\n", file=f)
That said, this is not a good code design choice. Making things more conscience can (at times) make it less readable.
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solved How do I put this into one line? [closed]