list_of_word_lengths.py

# Write code to create a list of word lengths for the words in original_str,
# using the accumulation pattern and assign the answer to a variable num_words_list.
# (You should use the len function).

original_str = "The quick brown rhino jumped over the extremely lazy fox"

original_list = list(original_str.split())
num_words = len(original_list)
num_words_list = []
for i in original_list:
    num_words_list.append((len(i)))

print(num_words_list)

Even more simplest:
num_words_list = []
original_str = "The quick brown rhino jumped over the extremely lazy fox"
for word in original_str.split():
num_words_list.append(len(word))