How to view the original functions encapsulated internally by Python functools.partial object?

Discovering Python functools.partial object: How to view its internal original functions?

In Python, after using functools.partial to create some application functions, we often want to know what information is stored inside it, especially the original functions. This article will explain in detail how to view the original functions inside functools.partial object.

Let's first look at an example, fix some parameters of the multiply function through functools.partial to generate a new callable object partial_function . Although type(partial_function) can confirm that its type is functools.partial , its original function cannot be displayed directly.

So, how do you view the original function of partial_function ? The answer is to access its func property.

functools.partial object has three read-only properties: func , args , and keywords . Among them, func attribute stores the modified original callable object (function or other callable object); args attribute stores preset position parameters; keywords attribute stores preset keyword parameters.

So, to see the original function of partial_function , just visit partial_function.func . This will directly return the original multiply function.

The following code example:

 import functools

def multiply(x, y):
    return x * y

partial_function = functools.partial(multiply, y=2)

print(partial_function.func) # Output:<function multiply at> (The address will vary depending on the operating environment)</function>

print(partial_function.func) will print a reference to the multiply function, clearly showing the functions modified by partial_function , so that we can understand the internal structure of functools.partial object and the original functions it encapsulates.

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