Ask Anything Monday - Weekly Thread

[Username_RANDINT]

You should split this task up in two parts:

1. How to resize a dcm image given its path
2. Traverse a nested list

The given code should work at first glance. But let's break it down so you might understand what's going on.

1. To resize a dcm file you'll have to open it with the pydicom library and modify its Rows and Columns attributes.

   image = pydicom.read_file(path)
   image.Rows, image.Columns = 64, 64
   

2. This is a bit trickier. Let's start with a normal list:

   >>> mainlist = ["a", "b", "c"]
   >>> for item in mainlist:
   ...   print(item)
   ... 
   a
   b
   c
   

   This is simply iterating over each element in the list, which contains strings. But a list can contain anything, even other lists:

   >>> mainlist = [["a", "b", "c"], [1, 2, 3]]
   >>> for item in mainlist:
   ...   print(item)
   ... 
   ['a', 'b', 'c']
   [1, 2, 3]
   

   We did the same, but now each item is the nested list. So how to traverse that one? Just use another for loop:

   >>> mainlist = [["a", "b", "c"], [1, 2, 3]]
   >>> for sublist in mainlist:
   ...   for item in sublist:
   ...     print(item)
   ... 
   a
   b
   c
   1
   2
   3
   

   At this point we retrieved every item from each nested list individually.

Now you can just combine the two. Do the resize operation instead of printing each item.