CODEWITHSUNDEEP
pythonfunctionif-statement
Ronald bergurman 3rd
Ronald bergurman 3rd

Reputation: 43

How do you carry over values from another def?

so i just started learning python in school and I've been practicing it at home so i am new to python. The problem im having is that i am trying to carry over the values from def two() into main(), however when i use {0} to put them in a print or a calculation, it says error and that they don't have any value.

here's my code:

def two():
  print("Hello world!")
  print("Please enter three numbers")
  nam=int(input("Enter the first number: "))
  num=int(input("Enter the second number: "))
  nom=int(input("Enter the third number: "))
  print("So the numbers you have entered are {0}, {1},{2}.".format(nam,nom,num))

def main():
  main=two()
  inpt=input("what math related problem would you like me to do with them? tell me here: ").capitalize()
  if inpt== "Divide":
    ans=({0}/{1}/{2})/1
    print("{0}, there you go!")
  elif inpt== "Times":
    ans=(nam*num*nom)/1
    print("{1}, there you go!")

And heres what i get from running it:

>>> main()
Hello world!
Please enter three numbers
Enter the first number: 30
Enter the second number: 30
Enter the third number: 30
So the numbers you have entered are 30, 30, 30.
what math related problem would you like me to do with them? tell me here:    divide
Traceback (most recent call last):
File "<pyshell#4>", line 1, in <module>
main()
File "C:\Users\chemg\Documents\PracticePY.py", line 40, in main
ans=({0}/{1}/{2})/1
TypeError: unsupported operand type(s) for /: 'set' and 'set'

Upvotes: 0

Views: 978

Answers (3)

Pythonista
Pythonista

Reputation: 11625

You can return the values from your previous function and then set them to be variables.

At the end of two()

return nam, num, nom

In main() where you set main = two()

nam, num, nom = two()

Also, you should rename main you can override functionality by using namespaces that are already reserved.

You can then do division with these values

ans = nam / num / nom

As it is now these are singletons i.e. - sets containing one element.

You can then use format to input these into your strings in your print statements

Upvotes: 1

Jacob Turpin
Jacob Turpin

Reputation: 190

The issue at play here is that you're attempting to apply string formatting to a non-string operation within your main function.

print("So the numbers you have entered are {0}, {1},{2}.".format(nam,nom,num))

The curly braces that you're using in the line above only substittue for values within that single format function call. When you call ans=({0}/{1}/{2})/1 , you're actually creating three separate sets; that's a different Python data type. You're getting that error because sets are not meant to be divided like your code is attempting to do.

As mentioned in Slayer's answer, your best bet is to return all three variables form your 'two' function:

return nam, num, nom

That way, you can assign them other variable within your main function. I would highly recommend against creating a variable that's named the same thing as your function too. It'll create some very confusing behavior for you.

nam, num, nom = two()

Finally, the line of code that's actually creating the exception can be modified to work.

ans = nam / num / nom

Upvotes: 0

Teemu Piippo
Teemu Piippo

Reputation: 292

In your code here:

ans=({0}/{1}/{2})/1

{0}, {1} and {2} are sets containing one element. You can't divide sets, which is what the error is complaining about.

You will need to pass the values from two() to main(). See Slayer's answer for details as to how that is done.

You cannot just use the {0} tokens where-ever you want because they are read from strings by format() to format text. Outside a string it's a set containing zero.

Upvotes: 0

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