ch06

2021-10-28 17:38:47 +05:30
parent ef37ce0c4e
commit b6eb3ef8a7
32 changed files with 1063 additions and 0 deletions
@@ -0,0 +1,36 @@
+# oop/class.attribute.shadowing.py
+class Point:
+    x = 10
+    y = 7
+
+p = Point()
+print(p.x)  # 10 (from class attribute)
+print(p.y)  # 7 (from class attribute)
+
+p.x = 12  # p gets its own `x` attribute
+print(p.x)  # 12 (now found on the instance)
+print(Point.x)  # 10 (class attribute still the same)
+
+del p.x  # we delete instance attribute
+print(p.x)  # 10 (now search has to go again to find class attr)
+
+p.z = 3  # let's make it a 3D point
+print(p.z)  # 3
+
+print(Point.z)
+# AttributeError: type object 'Point' has no attribute 'z'
+
+
+"""
+$ python class.attribute.shadowing.py
+10
+7
+12
+10
+10
+3
+Traceback (most recent call last):
+  File "/Users/fab/srv/lpp3e/v3/ch06/oop/class.attribute.shadowing.py", line 20, in <module>
+    print(Point.z)
+AttributeError: type object 'Point' has no attribute 'z'
+"""