通过命令行将值传递给Python类 [英] Pass in a value into Python Class through command line

问题描述

我有一些代码可以从命令行将变量传递到脚本中。我可以为 var arg传递任何值到 function 中。问题是当我将 function 放到一个类中时，变量不会被读取到 function 中。脚本为：

I have got some code to pass in a variable into a script from the command line. I can pass any value into function for the var arg. The problem is that when I put function into a class the variable doesn't get read into function. The script is:

import sys, os

def function(var):
    print var

class function_call(object):
    def __init__(self, sysArgs):
        try:
            self.function = None
            self.args = []
            self.modulePath = sysArgs[0]
            self.moduleDir, tail = os.path.split(self.modulePath)
            self.moduleName, ext = os.path.splitext(tail)
            __import__(self.moduleName)
            self.module = sys.modules[self.moduleName]
            if len(sysArgs) > 1:
                self.functionName = sysArgs[1]
                self.function = self.module.__dict__[self.functionName]
                self.args = sysArgs[2:]
        except Exception, e:
            sys.stderr.write("%s %s\n" % ("PythonCall#__init__", e))

    def execute(self):
        try:
            if self.function:
                self.function(*self.args)
        except Exception, e:
            sys.stderr.write("%s %s\n" % ("PythonCall#execute", e))

if __name__=="__main__":
    function_call(sys.argv).execute()

这可以通过输入来实现。 < arg1 arg2 ....> 。问题是我想选择一个我想在类中的函数，而不仅仅是一个函数本身。我尝试过的代码是相同的，只是 function（var）：在一个类中。我希望就如何修改我的 function_call 类接受一些想法。

This works by entering ./function <function> <arg1 arg2 ....>. The problem is that I want to to select the function I want that is in a class rather than just a function by itself. The code I have tried is the same except that function(var): is in a class. I was hoping for some ideas on how to modify my function_call class to accept this.

如果我想通过在 Hello 值中，我像这样运行脚本- python function_call.py函数Hello 。然后将 var 变量打印为 Hello 。

If i want to pass in the value Hello I run the script like so -- python function_call.py function Hello. This then prints the var variable as Hello.

通过在命令行中输入变量，我可以在整个代码中使用该变量。如果脚本是一堆函数，我可以使用此代码选择函数，但我想在特定类中选择函数。代替 python function.py function hello ，我也可以输入类。 python function.py函数你好。

By entering the variable into the command lines I can then use this variable throughout the code. If the script was a bunch of functions I could just select the function using this code but I would like to select the functions inside a particular class. Instead of python function.py function hello I could enter the class in as well eg. python function.py A function hello.

另外，我遇​​到了在保存值以供外部使用时遇到的问题功能。如果有人能解决这个问题，我将非常感激。
_________________________________________________________________________________

Also I have encounter that I have problem's saving the value for use outside the function. If anyone could solve this I would appreciate it very much. _________________________________________________________________________________

修订代码。

class A:
    def __init__(self):
        self.project = sys.argv[2]
    def run(self, *sysArgs):
        pass
    def funct(self):
        print self.project

class function_call(object):
    def __init__(self, sysArgs):
        try:
            self.function = None
            self.args = []
            self.modulePath = sysArgs[0]
            self.moduleDir, tail = os.path.split(self.modulePath)
            self.moduleName, ext = os.path.splitext(tail)
            __import__(self.moduleName)
            self.module = sys.modules[self.moduleName]
            if len(sysArgs) > 1:
                self.functionName = sysArgs[1]
                self.function = getattr(A(), sysArgs[1])(*sysArgs[2:])
                self.args = sysArgs[2:]
        except Exception, e:
            sys.stderr.write("%s %s\n" % ("PythonCall#__init__", e))

    def execute(self):
        try:
            if self.function:
                self.function(*self.args)
        except Exception, e:
            sys.stderr.write("%s %s\n" % ("PythonCall#execute", e))


if __name__=="__main__":
    function_call(sys.argv).execute()
    inst_A = A()
    inst_A.funct()

感谢所有帮助。

推荐答案

您可能会找到 getattr 有用：

you might find getattr useful:

>>> argv = ['function.py', 'run', 'Hello']
>>> class A:
    def run(self, *args):
        print(*args)


>>> getattr(A(), argv[1])(*argv[2:])
Hello

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