Fileowners to filegroups - simple python excercise for list comprehension (I dont know the source)

SimpleExcFileowners2Filegroups.py

# Excercise sent by friend - I dont know the source
# fo is dict with fileowners - objective is to transfer it to fg (file group) where user (ie Randy) is unique key 
# and hold list of files
# fo = {"input.txt":"Randy","code.py":"Stan","Output.txt":"Randy"} -> fg = {"Randy":["input.txt","Output.txt"],"Stan":["code.py"]}

fo = {"input.txt":"Randy","code.py":"Stan","Output.txt":"Randy"}
fg = dict()

kelse = lambda fo,fg,k : fg.update({fo[k]:[k]})
kif = lambda fo,fg,k  : fg[fo[k]].append(k)

lc_file_group = [kif(fo,fg,k) if fo[k] in fg else kelse(fo,fg,k) for k in fo.keys()]

print(fg)