diff options
Diffstat (limited to 'notebooks/python/python_oo.ipynb')
| -rw-r--r-- | notebooks/python/python_oo.ipynb | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/notebooks/python/python_oo.ipynb b/notebooks/python/python_oo.ipynb index 9f0774a..fe717a9 100644 --- a/notebooks/python/python_oo.ipynb +++ b/notebooks/python/python_oo.ipynb | |||
| @@ -735,7 +735,7 @@ | |||
| 735 | "In object-oriented programming, inheritance is the mechanism of basing an object or class upon another object (prototype-based inheritance) or class (class-based inheritance), retaining similar implementation. Also defined as deriving new classes (sub classes) from existing ones such as super class or base class and then forming them into a hierarchy of classes.\n", | 735 | "In object-oriented programming, inheritance is the mechanism of basing an object or class upon another object (prototype-based inheritance) or class (class-based inheritance), retaining similar implementation. Also defined as deriving new classes (sub classes) from existing ones such as super class or base class and then forming them into a hierarchy of classes.\n", |
| 736 | "\n", | 736 | "\n", |
| 737 | "In most class-based object-oriented languages, an object created through inheritance, a \"child object\", acquires all the properties and behaviors of the \"parent object\" , with the exception of: constructors, destructor, overloaded operators and friend functions of the base class. \n", | 737 | "In most class-based object-oriented languages, an object created through inheritance, a \"child object\", acquires all the properties and behaviors of the \"parent object\" , with the exception of: constructors, destructor, overloaded operators and friend functions of the base class. \n", |
| 738 | "Inheritance allows programmers to create classes that are built upon existing classes, to specify a new implementation while maintaining the same behaviors (realizing an interface), to reuse code and to independently extend original software via public classes and interfaces.\n", | 738 | "Inheritance allows programmers to create classes that are built upon existing classes, to specify a new implementation while maintaining the same behaviors (realizing an interface), to reuse code and to independently extend original software via public classes and interfaces. It is a \"is-a\" relationship between base (parent) class and a derived (child) class.\n", |
| 739 | "\n", | 739 | "\n", |
| 740 | "One can simply view inheritance as a tool for code reuse.\n", | 740 | "One can simply view inheritance as a tool for code reuse.\n", |
| 741 | "\n", | 741 | "\n", |
| @@ -1048,7 +1048,13 @@ | |||
| 1048 | "\n", | 1048 | "\n", |
| 1049 | "Not all classes admit a linearization. There are cases, in complicated hierarchies, where it is not possible to derive a class such that its linearization respects all the desired properties. \n", | 1049 | "Not all classes admit a linearization. There are cases, in complicated hierarchies, where it is not possible to derive a class such that its linearization respects all the desired properties. \n", |
| 1050 | "`TypeError: Cannot create a consistent method resolution order (MRO) for bases X, Y` is raised then.\n", | 1050 | "`TypeError: Cannot create a consistent method resolution order (MRO) for bases X, Y` is raised then.\n", |
| 1051 | "\n" | 1051 | "\n", |
| 1052 | "\n", | ||
| 1053 | "## The Liskov substitution principle (LSP):\n", | ||
| 1054 | "\n", | ||
| 1055 | "Functions that use references to base class objects must be able to use objects of derived classes without knowing it.\n", | ||
| 1056 | "\n", | ||
| 1057 | "In other words: an object (such as a class) may be replaced by a sub-object (such as a class that extends the first class) without breaking the program.\n" | ||
| 1052 | ] | 1058 | ] |
| 1053 | }, | 1059 | }, |
| 1054 | { | 1060 | { |