gistfile1.txt

        '''
        bug_data is a dict like {'product': 'Cloud Services', 'version': 'Unspecified'}
        Is there a better way to do look for specific keys in that dict so I can say
        "You are missing one of the default fields
        '''
        if 'product' not in bug_data:
            return "Missing 'product' field"
        elif 'component' not in bug_data:
            return "Missing 'component' field"
        elif 'summary' not in bug_data:
            return "Missing 'summary' field"
        elif 'version' not in bug_data:
            return "Missing 'version' field"

@chartjes

dict = {'product': 'Cloud Services', 'version': 'Unspecified'}

def check_missing_keys():
    for x in ['product','component','version']:
        if x not in dict:
            return 'Missing "' + x + '" field'
    return 'all good'

print(check_missing_keys())

ikwattro@mbp666 ~/dev> python3 hello.py
Missing "component" field

or

print('Missing ' + ', '.join([x for x in ['product','component','version'] if not x in dict]) + ' field(s)')

required = {'product', 'component', 'summary', 'version'}
bug_data = {'product': 'Cloud Services', 'version': 'Unspecified'}
diff = required.difference(bug_data)
if diff:
    print('Missing ' + ', '.join(diff) + ' field(s)')

I like @rlittlefield's answer but how about: print('Missing {} field(s)'.format(', '.join(diff))) ?