From 2bbc40bfe1b91269dc2bf17902d911843ca93e56 Mon Sep 17 00:00:00 2001
From: Asocia <akkayas17@itu.edu.tr>
Date: Tue, 4 May 2021 14:10:09 +0300
Subject: [PATCH] TIL: Defining method outside of class

---
 python/defining-method-outside-of-class.md | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 python/defining-method-outside-of-class.md

diff --git a/python/defining-method-outside-of-class.md b/python/defining-method-outside-of-class.md
new file mode 100644
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+You can define methods outside of class definition. However, you need to make sure that you bound the method *to the class* itself **not** instance.
+
+```python
+class Foo:
+    x = 42
+
+
+def bar(self):
+    return self.x
+
+
+if __name__ == "__main__":
+    foo = Foo()
+
+    Foo.bar = bar
+    print(foo.bar())  # 42
+
+    foo.bar = bar
+    print(foo.bar())  # error, because `bar` doesn't know about `self`
+```