How Can I Call a Python Function Dynamically Using Its Name as a String?

Calling Functions via String Name

Imagine you have a scenario where you need to dynamically call a function using its name stored in a string. This may arise in scenarios involving highly dynamic environments or metaprogramming. Here's how to approach this in Python:

The key technique lies in Python's getattr function. It allows you to retrieve an attribute or method from an object given its name as a string. To call a function of a module dynamically:

import foo
func_name = "bar"
bar = getattr(foo, func_name)
result = bar()

In this example, we assume a module foo with a function bar. getattr(foo, 'bar') fetches the bar function reference. Invoking result = bar() executes the function, resulting in its output being stored in result.

Notably, getattr can be employed not just for module-level functions but also for class instances, class methods, and more. Its versatility makes it an essential tool for navigating Python's dynamic features.

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