Attribute Error in python

Question

I am getting an attribute error for the following code :

coininfo = [ {} for k in range(0,numberOftrials)]

coininfo[i].append([x,outcome(x)])

The following is the exact error screen i am getting:

Traceback (most recent call last):
   File "pr1.py", line 22, in <module>
runsimulation(numberOftrials,numberOfcoins)
  File "pr1.py", line 19, in runsimulation
coininfo[i].append([x,outcome(x)])
AttributeError: 'dict' object has no attribute 'append'

Any help is appreciated!

Answer 1

When you run

coininfo = [ {} for k in range(0,numberOftrials)]

you end up with an array of dictionaries, not an array of arrays. Thus coininfo[i] is a dictionary, and you can't append to it.

My guess is that you want to change your first line to

coininfo = [ [] for k in range(0,numberOftrials)]

so you will instead have an array of arrays. Alternative, if you mean for your output to be an array of dictionaries, you may mean to have

coininfo[i][x] = outcome(x)

instead of

coininfo[i].append([x,outcome(x)])