What are Python Namespaces why are they used?

Python Namespaces are collections of different objects that are associated with unique names whose lifespan depends on the scope of a variable. The scope is a region from where we can access a particular object. There are three levels of scopes: built-in (outermost), global, and local. We can only access an object if its scope allows us to do so.

For example:

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# global namespace
var_a = 75
def A_func():
 
    # local namespace
    var_b = 38
    def B_inner_func():
 
        # nested local 
	# namespace
        var_c = 24

We cannot access the variable var_a if we refer to it in the nested local namespace (where var_c is present). If we try to assign a new value to var_a from here, a new variable gets created in the nested local namespace.