[solved] Importing Python modules on Android?

flo

Hello again,

I am working on an experiment in which I read in coordinates from a CSV file (and then use those to draw lines which are essentially my stimuli). I wrote the code and everything works nicely in OpenSesame on my Mac. Now I want to deploy it to an Android tablet but the experiment crashes at the following line:

import csv

I am using functions from the csv module to read the .csv files (duh). I could probably work around this and write my own function to read in the csv files and extract the necessary data but I was wondering whether there's a way to make modules available on an Android tablet?

(I found this bit about available modules for the Android runtime but that doesn't really answer my question.)

Thanks!

• Florian

flo

I tried to work around this issue by saving the content of the .csv file as a .py file. The content of the .py file is something like this:

coord = [['-514', '-352'], ['-335', '0'], ['-181', '-2'], ['-168', '102'], ['-67', '104'], ['0', '234'], ['2', '-284'], ['160', '0'], ['328', '-2'], ['444', '174'], ['486', '2']]

Then I use:

exec( exp.get_file('practice_0.py')  )

This, I hope, should produce a list called coord that contains my coordinates.

The file practice_0.py is in the experiment's file pool. This gives me the following error, though:

---

Traceback (also in debug window):
File "/Applications/OpenSesame.app/Contents/Resources/lib/python2.7/libopensesame/inline_script.py", line 150, in prepare
File "/Applications/OpenSesame.app/Contents/Resources/lib/python2.7/libopensesame/python_workspace.py", line 111, in _exec
File "", line 26, in
File "", line 1
/var/folders/7x/q_9tsb610gzcb3_b52fr85gw0000gn/T/tmpj5NFSD.opensesame_pool/practice_0.py
^
SyntaxError: invalid syntax

---

Something along these lines should work, right? What am I missing?

Thanks!

• Florian

sebastiaan

Hi Florian,

There are two questions here: The first is whether and how you can use the csv module on Android; the second is how you can execute a .py script from the file pool.

First, the csv module is part of the Python standard library, so you should just be able to use it on Android. No problem there.

Second, with exec() you execute a string of text that contains Python code. For example ...

exec('print("hi!")')

... will print 'hi!'. What you're trying to do is execute a filename. The contents of the file are a Python script, of course, but the filename itself is not. Do you see? So, if anything, you'll want to do this:

exp.python_workspace.run_file(pool['practice_0.py'])

This will run the contents of practice_0.py in the Python workspace that is used by OpenSesame. (exec() will normally use its own workspace.)

Cheers!
Sebastiaan

flo

Hi Sebastiaan,

thank you for your time. You are right, I am mixing up two issues in the same thread, sorry about the mess.

Importing the csv module

It does run without any issues on my computer but not on the tablet. Here's the crash report from my testing yesterday:

Launching /sdcard/Experiments/mirror tracing coordinates.opensesame.tar.gz
openexp.sampler._legacy.init_sound(): sampling freq = 48000, buffer size = 1024
experiment.run(): experiment started at Tue Dec  8 07:50:08 2015
Traceback (most recent call last):
  File "opensesame/main.py", line 122, in main
  File "opensesame/libopensesame/experiment.py", line 390, in run
  File "opensesame/libopensesame/item_store.py", line 95, in execute
  File "opensesame/libopensesame/item_store.py", line 110, in run
  File "opensesame/libopensesame/sequence.py", line 49, in run
  File "opensesame/libopensesame/item_store.py", line 110, in run
  File "opensesame/libopensesame/inline_script.py", line 107, in run
osexception: 
Error while executing inline script

item-stack: experiment[run].setup_script[run]
exception type: ImportError
exception message: No module named csv
item: setup_script
time: Tue Dec  8 07:50:08 2015
phase: run

Traceback:
  File "opensesame/libopensesame/inline_script.py", line 102, in run
  File "opensesame/libopensesame/python_workspace.py", line 160, in _exec
  File "<string>", line 6, in <module>
ImportError: No module named csv

By the way, I am also using the line "from random import shuffle" in my script and that doesn't give me any trouble (neither on my computer nor on the tablet). Not sure whether that's relevant...

Executing strings of text as code

Ahh, I understand the difference. Thank you. I still wasn't able to get it to work, though. OpenSesame tells me:

AttributeError: 'python_workspace' object has no attribute 'run_file'

Again, thank you!

• Florian

flo

EDIT: Okay, I am an idiot. Your line of code works like a charm - on the tablet.

(I deleted the post I wrote here before...)