Python name 'os' is not defined even though it is explicitly imported

Question

I have a module called imtools.py that contains the following function:

import os 

def get_imlist(path):
    return[os.path.join(path,f) for f in o         


        

Answer 1

Same problem is with me I am also trying to follow the book of Programming Computer Vision with Python by Jan Erik Solem" [http://programmingcomputervision.com/]. I tried to explore on internet to see the problem but I did not find any valuable solution but I have solved this problem by my own effort.

First you just need to place the 'imtools.py' into the parent folder of where your Python is installed like C:\Python so place the file into that destination and type the following command:

from PIL import Image
from numpy import *
from imtools import *

Instead of typing the code with imtools.get_imlist() you just to remove the imtools from the code like:

get_imlist()

This may solve your problem as I had found my solution by the same technique I used.

Answer 2

Based on small hints, I'm going to guess that your code didn't originally have the import os line in it but you corrected this in the source and re-imported the file.

The problem is that Python caches modules. If you import more than once, each time you get back the same module - it isn't re-read. The mistake you had when you did the first import will persist.

To re-import the imtools.py file after editing, you must use reload(imtools).