def t0():
e= DictAttr( a=2)
e.c=4
print( 'c' in e)
print( 'd' in e)
e['c']
print( e)
#e['d']
e['c']=3
print( 'c' in e)
print( e)
#e.update_pre( c=3)
#print(object.__repr__( e))
#print(object.__repr__( e.__dict__))
print(e.c)
print(e['c'])
def t0():
e= DictAttr( a=2)
assert ( e['a'] == 2 ),e
assert ( e.a == 2 ) ,e
assert len(e) == 1 ,e
e.c=4
assert ( 'c' in e) ,e
assert ( 'd' not in e),e
assert len(e) == 2 ,e
assert ( e.c == 4 ) ,e
assert ( e['c'] == 4 ),e
e['c']
print( e)
#e['d']
e['c']=3
assert ( 'c' in e) ,e
assert ( e.c == 3 ) ,e
print( e)
