How to Define Custom Operators in Python: Infix Operator Implementation?

Overriding Mathematical Operators in Python

In Python, the ability to define custom operators is a highly sought-after feature. Although Python does not inherently support operator redefinition, a clever technique can overcome this limitation.

Infix Operator Definition

This technique allows users to define infix operators, similar to the multiplication operator *, through the use of lambda functions. The syntax for defining an infix operator is:

<code class="python">operator = Infix(lambda x, y: operation)</code>

where lambda x, y: operation represents the function that performs the desired operation on operands x and y.

Usage Example

Consider the following examples:

• Simple Multiplication:

<code class="python">x = Infix(lambda x, y: x * y)
print (2 |x| 4)
# Output: 8</code>

• Class Checking:

<code class="python">isa = Infix(lambda x, y: x.__class__ == y.__class__)
print([1, 2, 3] |isa| [])
print([1, 2, 3] <<isa>> [])
# Output: True</code>

These examples demonstrate the power of this technique to extend Python's functionality by allowing the definition of custom operators.

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