def concatenate(string1, string2):
    combined_string = string1 + string2
    return combined_string

concatenate('ethan', 'white')
print combined_string

result = concatenate('ethan', 'white')
print result

print "The name of our professor is %s" % concatenate('ethan ', 'white')

def concatenate(string1, string2):
    combined_string = string1 + string2

result = concatenate('ethan', 'white')
print result

a = 10
b = 20
if a > 15:
    print 1
elif a == 10 and b < 100:
    print 2
elif b == 20:
    print 3
else:
    print 4

a = 10
b = 20
if a > 15:
    print 1
if a == 10 and b < 100:
    print 2
if b == 20:
    print 3
else:
    print 4

mystring = "hello world"
print mystring.upper()
print mystring.count('l')

mylist = [1, 3, 4, 2, 7]
print mylist.sort()
print mylist

mylist = [1, 3, 4, 2, 7]
mylist = mylist.sort()
print mylist