The reason why Python is not good for functional programming is that at the time of writing the language the inventor Guido considered the imperative use cases, while functional programming use cases are not covered. When you write imperative Python, then Python becomes one of the prettiest languages.
Below is a list of some functional things which you will miss in Python:
Large library of list functions
Functional dictionary class
A concise way to compose functions
The meaning of no pattern matching and no tail recursion in Python is your basic algorithms have to be written imperatively. Recursion is ugly and slow in Python.
There is no syntax for currying or composition means that point-free style is about as full of punctuation as explicitly passing arguments.
Iterators instead of lazy lists mean that you have to know whether you want efficiency or persistence and to scatter calls to list around if you want persistence. (Iterators are use-once)