Python Class -9 home work

print('Adding string character with total in dictionary')
string = 'hi mr partho yesterday was the 9th class and that class environment was really nice thank you'
counts = dict()

for line in string:
    words = line.split()

    for word in words:
        if word not in counts:
            counts[word] = 1
        else:
            counts[word] += 1

print(counts)

print('Sort the dictionary by bigger value till 8 nos value')
lst = list()
for key, val in list(counts.items()):
    lst.append((val, key))

lst.sort(reverse=True)

for key, val in lst[:8]:
    print(key, val)

print('Sort the dictionary by smaller value from third smaller value')
lst = list()
for key, val in list(counts.items()):
    lst.append((val, key))

lst.sort(reverse=False)

for key, val in lst[3:10]:
    print(key, val)

print('Calculate avarage by list')
numlist = list()
count=0
while (True):
    inp = input('Enter a number till to enter done: ')
    if inp == 'done': break
    else :
        try:
            value = float(inp)
        except:
            print('Invalid input')
            continue
        numlist.append(value)
        count =count+1

average = sum(numlist) / count
print('Average:', average)