d = {
'Adam': 95,
'Lisa': 85,
'Bart': 59
}
for key in d:
print key+':',d[key]

 

 

months = set(['Jan','Feb'])
x1 = 'Feb'
x2 = 'Sun'

if x1 in months:
print 'x1: ok'
else:
print 'x1: error'

if x2 in months:
print 'x2: ok'
else:
print 'x2: error'