I believe the root of your problem is that your scope .source.python
was declared twice.
To answer your second question first, No, my snippets.cson file was not blank when I first opened it. Instead, it contained the following:
# Your snippets
#
# Atom snippets allow you to enter a simple prefix in the editor and hit tab to
# expand the prefix into a larger code block with templated values.
#
# You can create a new snippet in this file by typing "snip" and then hitting
# tab.
#
# An example CoffeeScript snippet to expand log to console.log:
#
# '.source.coffee':
# 'Console log':
# 'prefix': 'log'
# 'body': 'console.log $1'
#
# Each scope (e.g. '.source.coffee' above) can only be declared once.
#
# This file uses CoffeeScript Object Notation (CSON).
# If you are unfamiliar with CSON, you can read more about it in the
# Atom Flight Manual:
# http://flight-manual.atom.io/using-atom/sections/basic-customization/#_cson
(This is on MacOS, though).
Notice how it instructs you that each scope can only be declared once. I think if you modify your two snippets to be included in the same scope, they will work as expected.
Changing your snippets.cson
to the following appears to work for me:
'.source.python':
'print statement':
'prefix': 'pr'
'body' : 'print "${1:Hello world}"'
'Argument variables import':
'prefix' : 'argv'
'body' : 'from sys import argv'
I can access both snippets from the snippets import menu once I make the .source.python
scope unique.