rspec/rules/S5756/python/rule.adoc

This rule raises an issue when a call is made to a non-callable object.

== Why is this an issue?

:link-with-uscores1: https://docs.python.org/3/reference/datamodel.html#object.__call__

In order to be callable, a Python class should implement the {link-with-uscores1}[``++__call__++``] method. Thanks to this method, an instance of this class will be callable as a function.


However, when making a call to a non-callable object, a `TypeError` will be raised.

In order to fix this issue, make sure that the object you are trying to call has a `++__call__++` method.

=== Code examples

==== Noncompliant code example

[source,python]
----
class MyClass:
    pass

myvar = MyClass()
myvar()  # Noncompliant

none_var = None
none_var()  # Noncompliant
----


==== Compliant solution

[source,python]
----
class MyClass:
    def __call__(self):
        print("called")

myvar = MyClass()
myvar()
----


:link-with-uscores1: https://docs.python.org/3/reference/datamodel.html#object.__call__

== Resources

=== Documentation

* {link-with-uscores1}[Python documentation - ++__call__++ method]


ifdef::env-github,rspecator-view[]

'''
== Implementation Specification
(visible only on this page)

=== Message

Fix this call; XX is not callable.


=== Highlighting

Primary: The name before the opening parenthesis

* Secondary 1 (if the call is made on a variable)
** location: The last value assigned.
** message: "Assigned value."
* Secondary 2
** location: The class definition
** message: "Definition."


'''
== Comments And Links
(visible only on this page)

=== relates to: S2873

endif::env-github,rspecator-view[]