Create a copy of its own source code

Create a copy of its own source code.

print((lambda str='print(lambda str=%r: (str %% str))()': (str % str))())

Output:

print(lambda str='print(lambda str=%r: (str %% str))()': (str % str))()

See also

https://www.w3resource.com/python-exercises/python-basic-exercise-90.php