>>> mydict = {}
>>> if (mydict.get('aaa') and mydict['aaa'] == 'ni'):
   ...:     print("true")
   ...: else:
   ...:     print("false")
   ...:
false
>>> if (all([mydict.get('aaa'), mydict['aaa'] == 'ni'])):
   ...:     print("true")
   ...: else:
   ...:     print("false")
   ...:
KeyError                                  Traceback (most recent call last)
<ipython-input-5-adddd34f38ce> in <module>()
    1 if (all([mydict.get('aaa'), mydict['aaa'] == 'ni'])):
    2     print("true")
    3 else:
    4     print("false")
    5