No, well-written documentation is not a good enough reason for learning a language.
Badly written documentation is a good reason for not learning one.
There are four reasons to learn a language:
Because it may be a useful tool in your career
Language is a tool. One use a language rather than another because of its benefits in a given context. The fact that a language has a high quality documentation doesn't make it a better tool, or only marginally¹.
Being able to use a tool in your daily life is one of the reasons to learn a language.
Because it broadens your culture and knowledge
Another reason to learn a language is to learn new concepts, paradigms and ways of writing elegant code (example: Haskell). Here again, documentation helps, but is not a sole reason to learn a language.
Because it requires minimum effort to learn it
Another reason to learn a language is because it's simple to learn (example: PHP). Again, documentation contributes a lot, but the language itself is still more important. Moreover, I would avoid telling during an interview that I learnt a language simply because it's easy to learn.
Because it's fun.
The last reason to learn a language is because it's simply exciting to learn either a well-designed language (examples: Haskell, Ruby) or a language for geeks (example: Brainfuck).
In a case of Python, what you can answer is that:
It's a dynamic language. Dynamic languages make it easy to create prototypes and to develop faster when circumstances make strong types not important.
It's elegant. Maybe not as elegant as, say, Haskell, but still the comparison with mainstream web-oriented languages such as PHP is easy to do.
The usage of meaningful indentation is interesting, given that many mainstream languages make indentation only a burden which should have been managed by the IDE in the first place. Haskell compiler and interpreter rely on indentation too, by the way.
Python has an elegant way to work with lists. List comprehensions and generator expressions are interesting concepts for someone who have never used functional programming before.
Django makes it very easy to create web applications fast while keeping code rather clean. This is a huge benefit over many other programming languages.
It's fast enough and powerful enough for large-scale web applications. For example, Dropbox is written in Python. YouTube relies heavily on Python. Reddit, if I remember well, also relies on Python.
¹ A well-written documentation still helps doing things the right way and fast.