[Python] Empty functions/methods with just the docstring valid in Python?

I have the following valid Python code:

class A:
def __init__(self):
"""
Some doc-string
"""
def some_method(self):
"""
Some other doc-string
"""

def say():
"""
Well that's it, no doc-string
"""

a = A()
print('works')


And it outputs works.

But I'm not able to understand how is this a perfectly valid Python code. Can somebody please help me to understand its functioning?

Also, are there any PEPs which discourage/disallow such code?

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