Doing a google search for "pythonic" reveals a wide range of interpretations. The wikipedia page says:
A common neologism in the Python community is pythonic, which can have a wide range of meanings related to program style. To say that code is pythonic is to say that it uses Python idioms well, that it is natural or shows fluency in the language. Likewise, to say of an interface or language feature that it is pythonic is to say that it works well with Python idioms, that its use meshes well with the rest of the language.
It also discusses the term "unpythonic":
In contrast, a mark of unpythonic code is that it attempts to write C++ (or Lisp, Perl, or Java) code in Python—that is, provides a rough transcription rather than an idiomatic translation of forms from another language. The concept of pythonicity is tightly bound to Python's minimalist philosophy of readability and avoiding the "there's more than one way to do it" approach. Unreadable code or incomprehensible idioms are unpythonic.
What does the term "pythonic" mean? How do I learn to effectively apply it in practice?
Best Answer
I've found that a most people have their own interpretations of what being "Pythonic" really means. From Wikipedia:
I've found that more times than not, more "pythonic" examples are actually derived from people trying to be clever with Python idioms and (again, more times than not) rendering their code virtually unreadable (which is not Pythonic).
As long as you're sticking to Python's idioms and avoiding trying to use C++ (or other language) styles in Python, then you're being Pythonic.
As pointed out by WorldEngineer, PEP8 is a good standard to follow (and if you use VIM, there are plugins available for PEP8 linting).
Really though, at the end of the day, if your solution works and isn't absolutely horribly un-maintainable and slow, who cares? More times than not, your job is to get a task done, not write the most elegant, pythonic code possible.
Another side note (just my opinion, feel free to downvote because of it ;)): I've also found the Python community to be filled with a ton of ego (not that most communities aren't, it's just a little more prevalent in communities such as C and Python). So, combining the ego with misconstrued interpretations of being "pythonic" will tend to yield a whole lot of baseless negativity. Take what you read from others with a grain of salt. Stick to official standards and documentation and you'll be fine.