CODEWITHSUNDEEP
pythonpython-3.x
user398843
user398843

Reputation: 191

Python3 input with different value types

string, integer = input("Enter a word and an integer: ")

Python3 returns that ValueError: too many values to unpack (expected 2). What can I do to fix that?

Upvotes: 1

Views: 198

Answers (4)

Kanwar Malik
Kanwar Malik

Reputation: 792

Following would work but both will be strings.

string, integer = input("Enter a word and an integer: ").split()

You need to have something like this.

string_val, integer_val = raw_input("String"), int(raw_input("Integer"))

It would fail if user doesn't enter an int. You might wanna user Try catch and inform the user.

Upvotes: 0

cglacet
cglacet

Reputation: 10912

There are several ways of doing this, I think that what may sound right is to impose a given type to the user:

def typed_inputs(text, *types):
    user_input = input(text).split()
    return tuple(t(v) for t, v in zip(*types, user_input))

Which can be used as follows: 

>>> types = (int, float, str)
>>> message = f"Input the following types {types} :"
>>> print(typed_inputs(message, types))
Input the following types (<class 'int'>, <class 'float'>, <class 'str'>) : 1 2.1 test
(1, 2.3, 'test')

Upvotes: 0

Joe Iddon
Joe Iddon

Reputation: 20414

You can unpack any iterable into variables.

A string is a variable, so for instance, you could do:

a,b = 'yo'

which gives a = 'y' and b = 'o'.

If you wish to unpack two "words", you must split your string on spaces to obtain a list of the two words.

I.e.

'hello user'.split()

Gives ['hello', 'user'].

You can then unpack this list into two variables.

This is what you want, but splitting the string returned from input().

I.e.

string, integer = input("Enter a word and an integer: ").split()

Is what you are looking for.

Oh, and if you want the integer variable to actually be an integer, you should convert it to one after:

integer = int(integer)

Upvotes: 0

Rarblack
Rarblack

Reputation: 4664

input() method returns a single string value unless you split it into parts with split()(by default splits where spaces are).

>>> string, integer = input("Enter a word and an integer: ")
Enter a word and an integer: test 5
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: too many values to unpack (expected 2)
>>> string, integer = input("Enter a word and an integer: ").split()
Enter a word and an integer: test 5
>>> string
'test'
>>> integer
'5'

Upvotes: 2

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