storing a numpy arrays in a list - list

Question

I'd like to automate the process of loading some ASCII datafiles in numpy in order to plot them. The filenames are given to the program via terminal and the content is loaded and saved in a list. So basically the idea is to have list that contains numpy arrays that I can call later via indexing to plot each individual data.
The problem I have is that indexing is not working with these lists I make
subplots_array = [[0,0],[0,0],[0,0],[0,0]]
subplots_axes = [0,0,0,0] #this array will allow to create subplots for '''
# each of the above data
fig = plt.figure()
counter = 0
for x in arguments_list:
for filename in glob.glob(x):
mydata = np.loadtxt(filename)
subplots_array[counter] = mydata # This loads the data from files
#specified in arguments argv into a subplot array as numpy sub-array
counter += 1
counter = 0
for x in subplots_array:
subplots_axes[counter] = fig.add_subplot(counter+1, 1, 1)
subplots_axes[counter].scatter(subplots_array[counter][:, 0]), subplots_array[counter][:, 1], s = 12, marker = "x")
counter = counter + 1
This is the error I get. The funny thing is if I substitute "counter" with a numerical index like 0 or 1 or 2 etc, the data is plotted correctly, despite counter being defined as an index as well. So I am out of ideas.
Traceback (most recent call last):
File "FirstTrial.py", line 89, in <module>
subplots_axes[counter].scatter(subplots_array[counter][:,0], subplots_array[counter][:, 1], s = 12, marker = "x")
TypeError: list indices must be integers or slices, not tuple
I hope this is enough description to help me solve the issue.

Answer 1

Your indentation is off, and with out your files I can't reproduce your code. But here's what I think is happening:
In [1]: subplots_array = [[0,0],[0,0],[0,0],[0,0]]
In [2]: subplots_array[0]=np.ones((2,3)) # one or more counter loops
indexing with counter==0 works:
In [4]: subplots_array[0][:,0]
Out[4]: array([1., 1.])
but your error with the next counter value:
In [5]: subplots_array[1][:,0]
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-5-0b654866bdee> in <module>
----> 1 subplots_array[1][:,0]
TypeError: list indices must be integers or slices, not tuple
Here I replaced one element of subplot_array with a 2d array, but left the others alone. They were initialed as lists:
In [6]: subplots_array
Out[6]:
[array([[1., 1., 1.],
[1., 1., 1.]]), [0, 0], [0, 0], [0, 0]]
So the problem isn't with the counter type itself, but with the next level of indexing.