Question

Hopefully I’ve explained it well enough in the title but here is what I have:

Input data:

Mushroom Kingdom, Mario

Hyrule, Link

Mushroom Kingdom, Bowser

Zebes, Samus

Zebes, Metroid

And I want to run something like this,

# The next three lines establish that I'll be reading proc as a file
import subprocess
cmd = 'external command that returns the above data'
proc = subprocess.Popen(cmd, stdout=subprocess.PIPE)

homeworlds = {}

while True:
  line = proc.stdout.readline().split(',')
  if line:
    # If line isn't empty
    homeword = line[0]
    person = line[1]

    homeworlds[homeword] = list.append[person] # Good logic? Bad syntax?

  else:
   break

The goal is that I’ll be able to call:

print homeworlds['Mushroom Kingdom']

and return the list

Mario, Bowser

Answer 1

 if not homeword in homeworlds:
    homeworlds[homeword] = list()
 homeworlds[homeword].append(person)