How python uses function variables

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Use function variables

Python's function is also a value: all functions are function objects, which means that the function itself can be assigned to variables, just as integers, floating-point numbers, lists, and tuples can be assigned to variables.

When a function is assigned to a variable, the program can then call the function through that variable. For example, the following code:

# define a function def pow (base, exponent) that calculates the multiplier: result = 1 for i in range (1, exponent + 1): result * = base return result# assigns the pow function to my_fun Then my_fun can be regarded as pow, using my_fun = powprint (my_fun (3,4)) # output 8 to define a function def area (width, height) for calculating area: return width * height# assigns the area function to my_fun, then my_fun can be used as area using my_fun = areaprint (my_fun (3,4)) # output 12

As can be seen from the above code, the program assigns the pow () and area () functions to the my_fun variable in turn, and then you can call the pow () and area () functions respectively through the my_fun variable.

In fact, python already has a built-in method to calculate the multiplier, so the pow () function here doesn't make much practical sense, just as a demonstration.

By assigning different functions to my_fun variables, you can make my_fun point to different functions at different times, thus making the program more flexible. Thus, the advantage of using function variables is to make the program more flexible.

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