[英]Python: How to generate the code on the fly?
I've got a problem, I have to generate program on the fly and then execute it. 我遇到了问题,我必须即时生成程序,然后执行它。 How could we do this? 我们该怎么做?
You can use the eval() function to execute code from a string 您可以使用eval()函数从字符串执行代码
An example would be: 一个例子是:
import math
test=r"dir(math)"
eval(test)
Output 输出量
['__doc__', '__name__', '__package__', 'acos', 'acosh', 'asin', 'asinh', 'atan', 'atan2', 'atanh', 'ceil', 'copysign', 'cos', 'cosh', 'degrees', 'e', 'exp', 'fabs', 'factorial', 'floor', 'fmod', 'frexp', 'fsum', 'hypot', 'isinf', 'isnan', 'ldexp', 'log', 'log10', 'log1p', 'modf', 'pi', 'pow', 'radians', 'sin', 'sinh', 'sqrt', 'tan', 'tanh', 'trunc']
However using eval is very unsafe, I suggest you go through using eval() safely 但是,使用eval是非常不安全的,我建议您安全地使用eval()
smart way: metapython -- http://metapython.org/ 聪明的方法:metapython- http ://metapython.org/
much-derided and not-generally-respected way: eval()
-- http://docs.python.org/library/functions.html 根深蒂固且不受普遍尊重的方式: eval()
-http : eval()
why do you want to do this, may I ask? 请问为什么要这么做?
如果您的意思是解释器,则只需从命令行键入“ python”。
If you just need to evaluate expression or some python code use eval
or literal_eval
depends on your requirements... 如果您只需要评估表达式或某些python代码,请使用eval
或literal_eval
取决于您的要求...
If you need to generate .py files, you may need code generator, here is the basic code generator: http://effbot.org/zone/python-code-generator.htm and then you can execute your code using execfile
如果需要生成.py文件,则可能需要代码生成器,以下是基本的代码生成器: http : //effbot.org/zone/python-code-generator.htm ,然后可以使用execfile
执行代码
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