"only" is often a bit touchy, depending on context. "Clearly" may also be of some concern.
Incidentally, in Python, "obvious" has an altogether different meaning: it refers to a solution which, once known, is clearly the best solution to the problem, even as read by a relative novice to the language. (The "one obvious way" is sometimes not obvious while you're trying to solve the problem, a phenomenon mentioned in "The Zen of Python".)
However, the usage is completely different, so most uses of the word "obvious" still shouldn't escape the red pen in Python-oriented technical writing.
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