如何从python中的函数返回字典和多个变量？

Question

I am trying to set up a function that records to 2 variables and a dictionary, the dictionar works but the two variables return the wrong things

mydict{}
fname = 0
lname = 0

def enterdetails(fname, lname):
    fname = input ("First Name: ");
    fnamedict = fname
    mydict['FirstName'] = fnamedict;

   lname = input ("Last Name: ");
   lnamedict = lname
   mydict['LastName'] = lnamedict;
   print(fname)
   print(lname)

   return mydict
   return (fname, lname)

fname, lname = enterdetails(fname, lname)
print(fname, lname)
print(mydict)

However the variables of fname and lname come out as FirstName and LastName respectively. How would I fix this?

Answer 1

You have two return statements, but only the first is returned. Instead, return all three variables together as a tuple:

def enterdetails(fname, lname):
    ...
    return mydict, fname, lname

mydict, fname, lname = enterdetails(fname, lname)
print(fname, lname)
print(mydict)

Answer 2

The dictionary works because you have it set as a global variable . However, the function is actually returning the "dictionary" first, so your unpacking is all messed up.

Remove the return mydict or use return mydict, (fname, lname) , so you will end up with:

mydict, (fname, lname) = enterdetails(fname, lname)

But as I mentioned above, mydict is a global variable, so it is unnecessary to return the value.

Answer 3

You can't put a return under a return like

return mydict
return (fname, lname) #this won't return any thing

One of the ways that you could do is:

  ....
  return [mydict, fname, lname]

data = enterdetails(fname, lname)
mydict = data[0]
fname = data[1]
lname = data[2]