取决于变量的方法调用方式? [英] Way to call method depending on variable?

问题描述

我已经有工作了，但是在我看来，对于长脚本的一部分来说，这并不是一个很好的解决方案.

I already have a working, but in my oppinion not beautiful solution for a part of a long script.

我的脚本使用了几种相似的方法，但相去甚远.但是，我到了要根据给定变量调用这些方法之一的地步.

My script uses several similar methods, that differ too much to combine. However I came to a point where I want to call one of those methods depending on a given variable.

方法的名称是这样构建的:

The names of the methods are build up like this:

def read_A():
    #doing sth
def read_B():
    #doing sth else
def read_C():

等

现在，当字母('A'，'B'，'C'，...)作为变量给出.

Now I would like to call those methods in a pythonic way, when the letter ('A', 'B', 'C', ...) is given as a variable.

一个非Python解决方案将是:

A non-pythonic solution would be:

if var == "A":
    read_A()
if var == "B":
    read_B() .....

我希望找到一个更Python化的解决方案，使我可以像这样简单地调用这些方法:

And I hope to find a more pythonic solution that allows me to call those methods simply like this:

var = "A"
read_var()      #This would call the method 'read_A()'

请注意，上面的代码仅是我希望执行的操作的图像，而不是可行的示例！

Please mind that the code above is only an image of what I hope to do, it is not a working example!

推荐答案

我看不到仅使用一个问题

I dont see an issue with just using

if var == 'A':
    read_a()

但是，如果您想使其更像"pythonic"，则可以使用字典将变量映射到方法，并根据存储在字典中的结果执行它:

but if you'd like to make it more 'pythonic' you could map your variables to the methods using a dictionary and execute it based on the result of what's stored in your dictionary:

def read_a():
    print('Running method read_a')

def read_b():
    print('Running method read_b')

switch = {'A': read_a, 'B': read_b}

case = 'A'
switch.get(case)()
>> 'Running method read_a'
case = 'B'
switch.get(case)()
>> 'Running method read_b'

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