Bryan Callow wrote:
> Could someone help me with a NameError that I can't seem to figure out.
> The program asks for an input and then runs two DC motors. It worked for
> a while and then when I reopened the program today I keep getting this
> error. Thank you. -Bryan
[...]
> print('Which direction would you like to move?')
> direction = input("Type 'f' for forward, 'b' for backward, or 'e' to exit:
> ")
> while direction not in exit_:
[...]
My crystal ball says:
Your script is written in Python 3, but you are trying to run it with Python
2.
Background: Python 2's input() function evaluates user input as a Python
expression -- if for example you enter 1+1 input() will return 2; if you
enter b input() will look up the variable b and fail with a NameError
because no such variable exists.
Run your script with
$ python3 yourscript.py
and everything should work as expected. To avoid such confusion in the
future you can insert
#!/usr/bin/env python3
as the first line, make the script executable with
$ chmod u+x yourscript.py
and run it with
$ ./yourscript.py
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