Let's get something straight.
If you're asking if Python is a good programming language to start with:
yes.
The issue has been discussed a billion time on the forum. You want to use a language with low syntax noise so that you can focus on the concepts behind algorithms and data structure. C, C++, Java, C#, Javascript are perfect examples of what you should avoid when first learning.
I'm not the only one to think this. MIT teaches its "Introduction to Programming" class in Python.
If you're asking if Python is a serious language:
yes.
Python is used intensively by Google, the NASA, reddit, Youtube, Yahoo! amongst other. Famous software using Python: Mercurial or Dropbox. Famous games using Python: Eve Online, Battlefield 2, Civilization IV.
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Be assured than learning Python now is one of the best ways to start.