python程序在执行的时候源文件被修改对正在执行的程序有影响吗？
我的python程序每一次需要比较长的时间才能跑完，但是有些时候我不想等到程序完成之后才去修改参数，可不可以在程序正在执行的时候修改源代码，然后再执行新的程序？不知道这样做可行不。
回复内容：
有影响，但很微小。
正在运行的程序本身不会受到影响，因为运行前已经自动编译到python字节码，并且在内存里运行了。除非你在程序里调用reload()来重新载入程序，否则不会影响运行。
但是，如果程序出现错误，抛出异常，则立即从当前的我python源文件读取并显示出错行。所以异常栈显示的是运行中程序出错行号，以及当前最新版本源码。看起来有点分裂罢了。
你应该用命令行参数，而不是修改程序……
那你的参数为什么要放在主py文件中？
你不能另外写一个文件来放你的参数么？
定期的检查这个参数文件（比如ini，csv，json）
然后改变程序执行的策略。
另写个脚本把正常的运行改成先复制一份再运行，
能不能用多线程的方式改变参数？不是很懂。
对这次和以后的运行来讲，不会。
想起来看过@Kyon N很有趣的一个回答，http://zhihu.com/question/39837216/answer/83451305
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