Sometimes, I like tweeting in code instead of plain words. So I tweeted this:
exec('class Me:\n def drink_beer(self): self.has_headache = True') ; me = Me() ; me.drink_beer() ; print me.has_headache #BEER
exec is a statement not a function1.
I had tried to use eval() first but it only accepts expression so exec seems to be right one to use because it accepts statement, well you can feed it with a entire source file actually. If we just give our code, then the code will be executed in current scope.
I do this is because I need to have one-liner code, you don’t have \n or <br/> on Twitter3, I just wrote it for fun. If you want to use eval() or exec in real program, you must use them with care.
| [1] | This would work because a tuple with only one element is not a tuple but the element unless you append with , after that only element2. So it is evaluated like exec only_element. |
| [2] | “A single item tuple must have a trailing comma, such as (d,),” from documentation. |
| [3] | Actually it has \n but you have to go to HTML source code, atom feed, or json via API. In the representation of HTML, \n doesn’t give your line break. |
Good post interesting to try make sense what is more a file and more a directory: both can store and get respresented like tuples plausible here storing everything loosely combining blobs and text entities in gae cloud and with mercurial source control fusing stuff most doable for easiest development environment we can create. Sincerely, Niklas
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