d = { 'Adam': 95, 'Lisa': 85, 'Bart': 59, 'Paul': 74 }
sum = 0.0
n=0
for k, v in d.items():
sum = sum + v
print k,":",v
n=n+1
print 'average', ':', sum/n
def square_of_sum(x):
sum=0
for a in x:
if isinstance(a,int):
b=a*a
sum=b+sum
print "sum:",sum
else:
return "Error Type, Please input int type"
return sum
