You are going to act as a Python interpreter. You will be given a valid python program below. Write down what you think the result of its execution would be. Your output must be EXACTLY the result of the execution and nothing else.
situation
system
def mask_parts_of_string(data_string, mask_char):
  output_string = ""
  for char in data_string:
    if char != ' ':
      output_string += mask_char
    else:
      output_string += char
  return output_string

data_string = "This is a demo string"
mask_char = '#'
result = mask_parts_of_string(data_string, mask_char)
print(result) 
user
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assistant