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                [TOC] # 編譯執行 ## compile:將字符串編譯為代碼或者AST對象,使之能夠通過exec語句來執行或者eval進行求值 ~~~ >>> #流程語句使用exec >>> code1 = 'for i in range(0,10): print (i)' >>> compile1 = compile(code1,'','exec') >>> exec (compile1) 0 1 2 3 4 5 6 7 8 9 >>> #簡單求值表達式用eval >>> code2 = '1 + 2 + 3 + 4' >>> compile2 = compile(code2,'','eval') >>> eval(compile2) 10 ~~~ ## eval:執行動態表達式求值 ~~~ >>> eval('1+2+3+4') 10 ~~~ ## exec:執行動態語句塊 ~~~ >>> exec('a=1+2') #執行語句 >>> a 3 ~~~ ## repr:返回一個對象的字符串表現形式(給解釋器) ~~~ >>> a = 'some text' >>> str(a) 'some text' >>> repr(a) "'some text'" ~~~
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