TypeError: file must have 'read' and 'readline' attributes

[hobbyist]

What it looks like you are trying to do is 'open' a directory to get all the images, so you can use them elsewhere.
I would recommend the glob module for that.

import glob

def open_train_data():
    return glob.glob('/home/mojito/Desktop/CNN/datasets/training_data/images/*') #the '*' is a 'wildcard' and it means to match one or more characters
 
for f in open_train_data():
   dict1 = pickle.load(f)
   ###do whatever else you need to

I ran the code you posted. I got this error:

Using TensorFlow backend.
Traceback (most recent call last):
  File "source_code_modified.py", line 78, in <module>
    dict1 = pickle.load(f)
TypeError: file must have 'read' and 'readline' attributes

It explodes at this point:

dict1 = pickle.load(f)