What types of data can generators and list comprehensions be used with in Python?

With any iterable data types. These include:

• Strings (str)
• Lists (list)
• Tuples (tuple)
• Sets (set)
• Dictionaries (dict)
• Ranges (range)
• Generators (generator)
• File objects
• Any user-defined classes implementing the __iter__() or __getitem__() method (supporting iteration by index).

Examples:

// List based on a string
my_list = [char.upper() for char in "hello"] 
// my_list will be ['H', 'E', 'L', 'L', 'O']

// Generator based on a dictionary
my_generator = (k + str(v) for k, v in {"a": 1, "b": 2}.items())
// my_generator can be iterated: 'a1', 'b2'

// Set based on a range
my_set = {x * x for x in range(5)}
// my_set will be {0, 1, 4, 9, 16}