[Python] How does defining what a function will return work [closed]

If i have a function Like:

def datamodelAuth(data : dict) -> str:
dataModelkeys = list(dataModel.keys())
dataKeys = list(data.keys())
count = 0
for keys in dataModelkeys:
if keys not in dataKeys:
return f"{keys} not found"
else:
count += 1
if count == len(dataModelkeys):
ret = createUser(data) # this function returns a string
return ret


Will this return the string from the createUser() function?

I have tried testing with string but i still had issues.

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