input: def explain_difference(data_type1: str, data_type2: str) -> str:
      """
      Explain the difference between two data types in Python.
      >>> explain_difference('list', 'tuple')
      '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.'
      """
output:     if data_type1 == 'list' and data_type2 == '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.'
      elif data_type1 == 'tuple' and data_type2 == 'list':
          return 'The difference between a tuple and a list in Python is that a tuple is immutable, meaning its contents cannot be changed, while a list is mutable, meaning its contents can be changed. A tuple has parentheses around it, while a list has square brackets around it. Tuples are used when the data is fixed and cannot be changed, while lists are used when the data needs to be changed.'
      elif data_type1 == 'set' and data_type2 == 'list':
          return 'The difference between a set and a list in Python is that a set is unordered and does not allow duplicate elements, while a list is ordered and allows duplicate elements. A set uses curly braces, while a list uses square brackets. Sets are used when the uniqueness of elements is important, while lists are used when the order and repetition of elements are important.'
      elif data_type1 == 'list' and data_type2 == 'set':
          return 'The difference between a list and a set in Python is that a list is ordered and allows duplicate elements, while a set is unordered and does not allow duplicate elements. A list uses square brackets, while a set uses curly braces. Lists are used when the order and repetition of elements are important, while sets are used when the uniqueness of elements is important.'
      elif data_type1 == 'dict' and data_type2 == 'list':
          return 'The difference between a dictionary and a list in Python is that a dictionary stores data in key-value pairs, while a list stores data as an ordered collection of elements. A dictionary uses curly braces with key-value pairs, while a list uses square brackets. Dictionaries are used when data needs to be accessed by keys, while lists are used when data needs to be accessed by index.'
      elif data_type1 == 'list' and data_type2 == 'dict':
          return 'The difference between a list and a dictionary in Python is that a list stores data as an ordered collection of elements, while a dictionary stores data in key-value pairs. A list uses square brackets, while a dictionary uses curly braces with key-value pairs. Lists are used when data needs to be accessed by index, while dictionaries are used when data needs to be accessed by keys.'
      else:
          return 'The difference between the two data types is not defined in this function.'