Name Error: name 'add' is not defined

Question

it my first time using Stack Overflow so please excuse any mistakes i have made. Im creating a program and i want ask mathematical questions for the user. But my program will generate two random numbers, and a random arithmetic operator will occur. They are plus, minus and times. So i put them into an array and this is the code.

Code:

The Error i gained:

It said the Error is in Line 10.

Ive tried doing this 'What is'+str(Ran) +,+str(op) +,+str(dom) +'?') However i gained an invalid syntax on the comma.

Ive tried searching for this particular program, but all of them seem to have something called classes and def in. If it is possible, can i please not use the def and class in my program because i am new to python and i still need to learn what they are.

I am using Python 3.4.2, on a Windows 8 operating system if you wanted to know. Thanks for reading, i am looking forward to have any assistance in my problem.

Answer 1

+ + is invalid syntax. You should be doing str(something) + ' ' + string(something_else) if you want to add two strings with a space in between. You also need quotes around add, minus and times in the list in order to make them strings.