Your task in this homework assignment is to create a derived class and extend the attributes and methods.

## Solution Specifications

Your solution to this problem must meet the following criteria.

1. Define a `Batman` class in `batman.py` python file that inherits the `DC_Superheros` class.

1. You must define a constructor that accepts four arguments:

* a string for `hero_name` found in the base class

* a list of strings for `parents` found in the base class

* a string for `real_name` added in the derived class

* a string for `symbol` added in the derived class

1. You must define a function named `reveal_identity` in the file `batman.py` which returns a string shown in the example below.

1. The file `batman.py` should not contain a main program, it should only contain your class.

To test your class, add code to the `batman_test.py` file.

Note that code in `batman_test.py` will not be graded.

1. Below is an example of a call to the `Batman.reveal_identity()` method which you could implement in `batman_test.py` to test your method.

Python Code:

```python

import batman

test_parents = ["Thomas Wayne", "Martha Wayne"]

test_superhero = "Batman"

test_real_name = "Bruce Wayne"

test_symbol = "bat"

test_batman = batman.Batman(test_superhero, test_parents, test_real_name, test_symbol)

print(test_batman.superhero_info())

print(test_batman.reveal_identity())

```

Output:

```html

Batman's parents are Thomas Wayne and Martha Wayne.

Batman's symbol is a bat and their real name is Bruce Wayne.

```

class DC_Superheros:

def __init__(self, hero_name, parents):

self.hero_name = hero_name

self.parents = parents

def superhero_info(self):

return "{}'s parents are {} and {}.".format(

self.hero_name, self.parents[0], self.parents[1]

)

import batman

# test the class

test_parents = ["Thomas Wayne", "Martha Wayne"]

test_superhero = "Batman"

test_real_name = "Bruce Wayne"

test_symbol = "bat"

test_batman = batman.Batman(test_superhero, test_parents, test_real_name, test_symbol)

print(test_batman.superhero_info())

print(test_batman.reveal_identity())