Sublime Forum

Python "in" operator issues?

#1

Hi there!
How are you?
I’m new in Sublime Text and Python and I’m getting some issues with the “in” operator in this piece of code:

print("Materias a elegir")
print("Informatica, Software, Usablidad")
input("Ingrese la materia escogida: ")
 
if materia in ("informatica", "software", "usabilidad"):
	print("Asignatura elegida " + materia)
else:
	print("La materia elegida no existe")

I’m getting this message when trying to rub it:

Traceback (most recent call last):
  File "AndOrIn.py", line 14, in <module>
    materia=input("Ingrese la materia escogida: ")
  File "<string>", line 1, in <module>
NameError: name 'Informatica' is not defined

Any idea of what could be going on?
Thanks a lot!
Ignacio

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#2

Your problem is in the use of input(), in particular when used in Python 2.

In Python 2, a call to input() prompts the user for input, and then uses eval() to try to evaluate it as an expression. So, whatever you input needs to be something that’s valid code, and most words are not. In Python 2, if you want to just grab input from the user, you need to use raw_input():

tmartin:dart:~> python
Python 2.7.18 (default, Apr 20 2020, 19:19:54) 
[GCC 9.3.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> material = input("enter the material: ")
enter the material: quartz
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<string>", line 1, in <module>
NameError: name 'quartz' is not defined
>>> material = raw_input("enter the material: ")
enter the material: quartz
>>> material
'quartz'
>>>

In Python 3 this was changed, so now input() does what raw_input() used to do in Python 2:

tmartin:dart:~> python3
Python 3.8.3 (default, May 15 2020, 02:05:39) 
[GCC 9.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> material = input("enter the material: ")
enter the material: quartz
>>> material
'quartz'

So the short answer to your question is, use raw_input() and not input() in your code here. If you’re following a tutorial of some sort and hitting this error, it’s because you’re trying to run the program in Python 2 instead of Python 3 as the tutorial probably expects.

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#3

Thanks a lot for your answer!
I thought I had installed python 3…
How do I check that on my mac (mojave)?
And being the case? Can I upgrade it?
Thanks again!
Kind regards!
Ignacio

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#4

What are you using to run your programs? Are you doing it directly from within Sublime, or from a command prompt/terminal window?

Also, what is the build number of your version of Sublime Text? (You can find that by picking Help: About from the command palette).

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#5

So far I’m using this option:
Tools\SublimeREPL\Python\Python - Run Current File
And the Build Number I’ve found is 4126
(\Sublime Text\About Sublime Text)

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#6

In that case, you need to check to see how SublimeREPL is configured to run Python. I don’t use that particular package (I prefer Terminus for this), but in all likelyhood is it configured to run a program named python when it should be executing python3.

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#7

Ok!
So, there’s a way to change that configuration? I couldn’t find it my self…

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#8

There is, yes; it’s been a while since I last looked at it though. I would refer to the README file on the package page and see if it talks about it.

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