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Python

Posted by Iskander Ismagilov
Iskander Ismagilov
13,298 Points

tuple: two variables has equal tuples, but they are not equal

Here is my code:

a = (0, 0)
b = input("a ")

if b == a:
  print("well done")

so when I launch this script and put (0, 0) in input, "well done" is not printed. Does anybody know why? Thank's in advance.

2 Answers

Chris Freeman
MOD
Chris Freeman
Treehouse Moderator 68,468 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,468 Points

As they say "looks" can be deceiving". In Python 3, the input() statement returns a string:

>>> a = (0, 0)
>>> b = input("> ")
> (0, 0)
>>> a == b
False
>>> type(a)
<class 'tuple'>
>>> type(b)
<class 'str'>

In Python 2, there was a distinction between input() and raw_input(). Python 2 input() was equivalent to eval(raw_input()) (docs)

In Python 3, input() is equivalent to the Python 2 raw_input(). You need to add the eval to get what you want:

>>> eval(b)
(0, 0)
>>> type(eval(b))
<class 'tuple'>
>>> a == eval(b)
True
Iskander Ismagilov
Iskander Ismagilov
13,298 Points
Iskander Ismagilov
Iskander Ismagilov
13,298 Points

Thank you very much, Chris.