Jan Riechers於 2012年7月21日星期六UTC+8下午3時33分27秒寫道： > Hello Pythonlist, > > I have one very basic question about speed,memory friendly coding, and > coding style of the following easy "if"-statement in Python 2.7, > but Im > sure its also the same in Python 3.x > > Block > #---------------------------------- > if statemente_true:
if an evaluated expression result is non-zero, then > doSomething() > else: # execute this block if the expression evaluated as zero > doSomethingElseInstead() > > #---------------------------------- > > versus this block: > #---------------------------------- > if statement_true: > doSomething() > return > > doSomethingElseInstead() > > #---------------------------------- > > > I understand the first pattern that I tell the interpreter to do: > Check if the conditional is true, run "doSomething()" else go > inside the > else block and "doSomethingElseInstead()". > > while the 2nd does only checks: > doSomething() if statement_true, if not, just go directly to > "doSomethingElseInstead() > > > Now, very briefly, what is the better way to proceed in terms of > execution speed, readability, coding style? > Letting out the fact that, in order to prevent > "doSomethingElseInstead"-Block to execute, a return has to provided. > > Thank you for reading and hope someone brings light into that. > > Your fellow python programmer > Jan Well, the C-style branching is inherited in python. Expressions and statements are different. -- http://mail.python.org/mailman/listinfo/python-list
