Fanan Kwanga's Assignment Q2. Choose any method your like. I think M1 looks more mature and is faster.

ass_q2.py

import re

# method 1
# using Regular Expressions AKA RegEx-es 
def lenFunction1():
  print("#### Method 1 ####")
  sentence = str(input("Enter valid sentence:"))
  # use RegEx substitution
  # param 1: find
  # param 2: replace
  # param 3: string
  sentence = re.sub(' ', '', sentence)
  sentence_len = len(sentence)
  print("The number of characters contained in your  sentence is: ", sentence_len)

# method 2
# Using a loop; 'for' in this case
def lenFunction2():
  print("#### Method 2 ####")
  sentence = str(input("Enter valid sentence:"))
  sentence_len = 0
  for letter in sentence:
    if letter != ' ':
      sentence_len+=1
  print("The number of characters contained in your  sentence is: ", sentence_len)

if __name__ == '__main__':
  lenFunction1() # 1
  lenFunction2() # 2