input: Write a function to explain the difference between a list and a tuple in Python. The explanation should include how one is mutable and the other is immutable, as well as the syntax difference between them. If the input is a list or a tuple, the function should return a string explaining the differences in terms of mutability and syntax.
  assert explain_difference([1, 2, 3])=="The difference between a list and a tuple in Python is that a list is mutable, meaning its contents can be changed, while a tuple is immutable, meaning its contents cannot be changed. A list has square brackets around it, while a tuple has parentheses around it. Lists are used when the data needs to be changed, while tuples are used when the data is fixed and cannot be changed."
  assert explain_difference((1, 2, 3))=="The difference between a list and a tuple in Python is that a list is mutable, meaning its contents can be changed, while a tuple is immutable, meaning its contents cannot be changed. A list has square brackets around it, while a tuple has parentheses around it. Lists are used when the data needs to be changed, while tuples are used when the data is fixed and cannot be changed."
  assert explain_difference('abc')=="The input is not a list or a tuple."
output: def explain_difference(input_data):
      if isinstance(input_data, list):
          return "The difference between a list and a tuple in Python is that a list is mutable, meaning its contents can be changed, while a tuple is immutable, meaning its contents cannot be changed. A list has square brackets around it, while a tuple has parentheses around it. Lists are used when the data needs to be changed, while tuples are used when the data is fixed and cannot be changed."
      elif isinstance(input_data, tuple):
          return "The difference between a list and a tuple in Python is that a list is mutable, meaning its contents can be changed, while a tuple is immutable, meaning its contents cannot be changed. A list has square brackets around it, while a tuple has parentheses around it. Lists are used when the data needs to be changed, while tuples are used when the data is fixed and cannot be changed."
      else:
          return "The input is not a list or a tuple."