C# Python input method returns an error

Question

I've just started to learn IronPython and I tried the code below which returned IronPython.Runtime.UnboundNameException: 'name 'hello' is not defined'.
Code:

var py = Python.CreateEngine();
var scope = py.CreateScope();
py.Execute(@"word = input('Input string\n')", scope);
var input = scope.GetVariable("word");
py.Execute("print " + input);

Console run ok, then it asked me to Input string, and I typed into "hello". And then it fired off the above error message. Then I tried this one just to see if it does without input method:

py.Execute(@"x = 2 + 3", scope);
py.Execute("print 'result'," + scope.GetVariable("x"));

So that one was ok.

Can someone please explain why can I not retrieve a variable from "input" method? and why is it an UnboundNameException?

Many thanks!

If you're using Python 2, then you need to use raw_input, not input. — khelwood
– khelwood, Commented Apr 18, 2018 at 8:23
is wrod a typo here: var input = scope.GetVariable("wrod"); — stevenferrer
– stevenferrer, Commented Apr 18, 2018 at 8:25
@khelwood I tried raw_input and now it returns IronPython.Runtime.UnboundNameException: 'global name 'hello' is not defined'. But now this error is at the line where print method is. — Vlad
– Vlad, Commented Apr 18, 2018 at 8:31

BugFinder · Accepted Answer · 2018-04-18 08:42:44Z

2

Having never worked with ironpython the answer lies within your own code.

your code:

py.Execute(@"word = input('Input string\n')", scope); (I type in dog)
var input = scope.GetVariable("word");
py.Execute("print " + input);

results in that last line saying py.Execute("print dog") ... but there is no dog varaible.

yet here:

py.Execute("print 'result'," + scope.GetVariable("x"));

You know to encapsulate text in quotes..

Id speculate that

py.Execute("print " + input);

Should read

py.Execute("print '" + input + "'");

Which results in print 'dog'

answered Apr 18, 2018 at 8:42

BugFinder

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5 Comments

Vlad Over a year ago

yes! You're absolutely right! It worked like a charm! Those bloody quotes! :))) Thanks for making my day! You're a star!

BugFinder Over a year ago

See you had the answer.. I havent ever coded in python, but you had the logic in front of you to answer it The reason print 'result',<somevariable contents> probably works is because its a comma not a +

Vlad Over a year ago

Hah! My gosh! I didn't even notice that LOL that's because you're a pro and am a complete beginner. Thanks for pointing that out.

BugFinder Over a year ago

I now get to annoy people by adding pyton to my list .. awesome - age 16 I was sitting in a university area pootling about on unix, bloke next to me ranted, F'd and blinded, i gave in and asked what was wrong. He pointed at his code.. I suggested a fix, I was right.. i had heard of the language, never used it, still havent, and fixed his PhD project.. so.. now I have 2 .. go me

Vlad Over a year ago

Good to have such folks like yourself on this website! Yous are an asset ;) Take care!

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