Is there a way to call specific classes based on a variable?

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I want a program to call a specific class based on a parameter/variable value. However, I don't want to use any clunky if-statements. My first thought was to use the globals() function, but I couldn't get it to work. He's an example:

class SomeClass:
    def __init__():
        print("Hello, world!")

class OtherClass:
    def runClass(className):
        # Call class based on variable className

The reason I want to do this is because there is a wide variety of classes may need to be called, and so just piling up if-statements in my code won't do it. Any help would be greatly appreciated. Thanks!

已经知道答案啦