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+A [`docstring`](https://docs.python.org/3/glossary.html#term-docstring) is a string with triple quotes that often used in file, classes, functions, etc. Docstrings usually has clear explanation, parameter(s) and return type.
+
+Here's an example of usage of a docstring:
+```py
+def greet(name, age) -> str:
+  """
+  :param name: The name to greet.
+  :type name: str
+  :param age: The age to display.
+  :type age: int
+  :return: String of the greeting.
+  """
+  return_string = f"Hello, {name} you are {age} years old!"
+  return return_string
+```
+You can get the docstring by using `.__doc__` attribute. For the last example you can get it through: `print(greet.__doc__)`.