NameError issue

Coding
1

Hi all,
Total noob with PsychoPy trying to make a script work on my machine (Mac OS Catalina 10.15.7). The script works fine on another machine but with mine I get a NameError warning.

The bit of code that seems problematic is shown below. Its a neuroscience study in which we select various stimulus files stored in the csv format depending on different conditions. The variable defining which scenario is used is csv_file. We then try to read this file with pd.read_csv(csv_file)…

Define trials from csv

if expInfo[‘site’] == ‘LeftTP’:
# load left TP trials
if expInfo[‘session’] == ‘PreTMS’:
if expInfo[‘run’] == 1:
csv_file = “trial_list/trials_ses1_run1.csv”
elif expInfo[‘run’] == 2:
csv_file = “trial_list/trials_ses1_run2.csv”
elif expInfo[‘run’] == 3:
csv_file = “trial_list/trials_ses1_run3.csv”
elif expInfo[‘session’] == ‘PostTMS’:
if expInfo[‘run’] == 1:
csv_file = “trial_list/trials_ses1_run4.csv”
elif expInfo[‘run’] == 2:
csv_file = “trial_list/trials_ses1_run5.csv”
elif expInfo[‘run’] == 3:
csv_file = “trial_list/trials_ses1_run6.csv”
elif expInfo[‘site’] == ‘RightTP’:
# load right TP trials
if expInfo[‘session’] == ‘PreTMS’:
if expInfo[‘run’] == 1:
csv_file = “trial_list/trials_ses2_run1.csv”
elif expInfo[‘run’] == 2:
csv_file = “trial_list/trials_ses2_run2.csv”
elif expInfo[‘run’] == 3:
csv_file = “trial_list/trials_ses2_run3.csv”
elif expInfo[‘session’] == ‘PostTMS’:
if expInfo[‘run’] == 1:
csv_file = “trial_list/trials_ses2_run4.csv”
elif expInfo[‘run’] == 2:
csv_file = “trial_list/trials_ses2_run5.csv”
elif expInfo[‘run’] == 3:
csv_file = “trial_list/trials_ses2_run6.csv”
elif expInfo[‘site’] == ‘LeftPreCG’:
# load Left M1 trials
if expInfo[‘session’] == ‘PreTMS’:
if expInfo[‘run’] == 1:
csv_file = “trial_list/trials_ses3_run1.csv”
elif expInfo[‘run’] == 2:
csv_file = “trial_list/trials_ses3_run2.csv”
elif expInfo[‘run’] == 3:
csv_file = “trial_list/trials_ses3_run3.csv”
elif expInfo[‘session’] == ‘PostTMS’:
if expInfo[‘run’] == 1:
csv_file = “trial_list/trials_ses3_run4.csv”
elif expInfo[‘run’] == 2:
csv_file = “trial_list/trials_ses3_run5.csv”
elif expInfo[‘run’] == 3:
csv_file = “trial_list/trials_ses3_run6.csv”
elif expInfo[‘site’] == ‘Vertex’:
# load Vertex trials
if expInfo[‘session’] == ‘PreTMS’:
if expInfo[‘run’] == 1:
csv_file = “trial_list/trials_ses4_run1.csv”
elif expInfo[‘run’] == 2:
csv_file = “trial_list/trials_ses4_run2.csv”
elif expInfo[‘run’] == 3:
csv_file = “trial_list/trials_ses4_run3.csv”
elif expInfo[‘session’] == ‘PostTMS’:
if expInfo[‘run’] == 1:
csv_file = “trial_list/trials_ses4_run4.csv”
elif expInfo[‘run’] == 2:
csv_file = “trial_list/trials_ses4_run5.csv”
elif expInfo[‘run’] == 3:
csv_file = “trial_list/trials_ses4_run6.csv”

Import comma separated trial list

trial_csv = pd.read_csv(csv_file)

But I get this unique error message:

Traceback (most recent call last):
File “/Path/to/script.py”, line 122, in
trial_csv = pd.read_csv(csv_file)
NameError: name ‘csv_file’ is not defined

Experiment ended.

Any idea what that could be. Can send other bits of code if needed.

Thanks!
Nick

2

Hello Nick,

you code is really difficult to read because you forget to add triple ` around it. This gives proper formatting in this forum enhancing reading and error detection :smiley: You probably figured yourself that the program complains that csv_file is not defined. Did you initialise csv_file somewhere?

Best wishes Jens

3

Hi Jens,
Thanks for your reply. Sorry I missed the triple `. Will keep it in mind for next time :wink:
In the mean time I found the solution, i.e.: quoting the values of expInfo, which works with txt.
Thanks again for being willing to help!
Nick