UltiSnips auto-completions that don't expand in comments

python.snippets

global !p
pythonZones = [ 'pythonStatement', 'pythonConditional', 'pythonRepeat',
    'pythonOperator', 'pythonException', 'pythonInclude', 'pythonAsync',
    'pythonDecorator', 'pythonDecoratorName', 'pythonFunction',
    'pythonTodo', 'pythonString', 'pythonRawString', 'pythonQuotes',
    'pythonTripleQuotes', 'pythonEscape', 'pythonNumber', 'pythonBuiltin',
    'pythonExceptions', 'pythonSpaceError', 'pythonDoctest', 'pythonDoctestValue']
commentZones   = ['pythonComment']
pythonZoneIds  = vim.eval('map('+str(pythonZones)+", 'hlID(v:val)')")
commentZoneIds = vim.eval('map('+str(commentZones)+", 'hlID(v:val)')")

def isCode():
    """ https://vi.stackexchange.com/a/18494/10033 """
    synstackids = vim.eval("synstack(line('.'), col('.') - (col('.')>=2 ? 1 : 0))")
    print("synstackids: {} commentZoneIds: {}  pythonZoneIds: {}" \
        .format(synstackids, commentZoneIds, pythonZoneIds))
    if not synstackids:
        return True
    if not set(synstackids).isdisjoint(pythonZoneIds):
        return True
    return False
endglobal

context "isCode()"
snippet /(\S.*) unless / "unless" rA
if not $1:
    `!p snip.rv = match.group(1)`
$0
endsnippet

context "isCode()"
snippet 'return unless' "return unless" wA
if not $1:
    print("return_unless: $1")
    return $2
$0
endsnippet

context "isCode()"
snippet 'return if' "return if" wA
if $1:
    print("return_if: $1")
    return $2
$0
endsnippet