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A D Vishnu Prasad
2020-05-29 19:15:25 +05:30
parent fc9f806d2c
commit bd46830659
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6
Notes/05_Object_model/00_Overview.md
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@@ -13,8 +13,8 @@ It's not necessary to worry about the inner details to be productive.
However, most Python coders have a basic awareness of how classes
work. So, that's why we're covering it.
* [5.1 Dictionaries Revisited (Object Implementation)](01_Dicts_revisited)
* [5.2 Encapsulation Techniques](02_Classes_encapsulation)
* [5.1 Dictionaries Revisited (Object Implementation)](01_Dicts_revisited.md)
* [5.2 Encapsulation Techniques](02_Classes_encapsulation.md)
[Contents](../Contents)
[Contents](../Contents.md)

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Notes/05_Object_model/01_Dicts_revisited.md
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@@ -1,4 +1,4 @@
[Contents](../Contents) \| [Previous (4.4 Exceptions)](../04_Classes_objects/04_Defining_exceptions) \| [Next (5.2 Encapsulation)](02_Classes_encapsulation)
[Contents](../Contents.md) \| [Previous (4.4 Exceptions)](../04_Classes_objects/04_Defining_exceptions) \| [Next (5.2 Encapsulation)](02_Classes_encapsulation)
# 5.1 Dictionaries Revisited
@@ -279,7 +279,7 @@ about class ordering.
* Children are always checked before parents
* Parents (if multiple) are always checked in the order listed.
The MRO is computed by sorting all of the classes in a hierarchy
The MRO is computed by sorting all of the classes in a hierarchy
according to those rules.
```python
@@ -387,7 +387,7 @@ that you saw that.
## Exercises
In Section 4, you defined a class `Stock` that represented a holding of stock.
In Section 4, you defined a class `Stock` that represented a holding of stock.
In this exercise, we will use that class. Restart the interpreter and make a
few instances:
@@ -444,7 +444,7 @@ the `__dict__` object:
Here, you really notice the fact that an instance is just a layer on
top of a dictionary. Note: it should be emphasized that direct
manipulation of the dictionary is uncommon--you should always write
your code to use the (.) syntax.
your code to use the (.) syntax.
### Exercise 5.3: The role of classes
@@ -457,7 +457,7 @@ to their associated class:
... look at output ...
>>> ibm.__class__
... look at output ...
>>>
>>>
```
Try calling a method on the instances:
@@ -520,7 +520,7 @@ However, notice that it is not part of the instance dictionary:
The reason you can access the `foo` attribute on instances is that
Python always checks the class dictionary if it can't find something
on the instance itself.
on the instance itself.
Note: This part of the exercise illustrates something known as a class
variable. Suppose, for instance, you have a class like this:
@@ -567,7 +567,7 @@ two steps and something known as a bound method. For example:
>>> s(25)
>>> goog.shares
75
>>>
>>>
```
Bound methods actually contain all of the pieces needed to call a
@@ -656,5 +656,5 @@ Here's how the `cost()` method of instance `n` above would be found:
>>>
```
[Contents](../Contents) \| [Previous (4.4 Exceptions)](../04_Classes_objects/04_Defining_exceptions) \| [Next (5.2 Encapsulation)](02_Classes_encapsulation)
[Contents](../Contents.md) \| [Previous (4.4 Exceptions)](../04_Classes_objects/04_Defining_exceptions) \| [Next (5.2 Encapsulation)](02_Classes_encapsulation)

12
Notes/05_Object_model/02_Classes_encapsulation.md
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@@ -1,8 +1,8 @@
[Contents](../Contents) \| [Previous (5.1 Dictionaries Revisited)](01_Dicts_revisited) \| [Next (6 Generators)](../06_Generators/00_Overview)
[Contents](../Contents.md) \| [Previous (5.1 Dictionaries Revisited)](01_Dicts_revisited) \| [Next (6 Generators)](../06_Generators/00_Overview)
# 5.2 Classes and Encapsulation
When writing classes, it is common to try and encapsulate internal details.
When writing classes, it is common to try and encapsulate internal details.
This section introduces a few Python programming idioms for this including
private variables and properties.
@@ -279,7 +279,7 @@ are extracted:
Specifically, notice how you have to add the extra () to `cost` because it is a method.
You can get rid of the extra () on `cost()` if you turn it into a property.
You can get rid of the extra () on `cost()` if you turn it into a property.
Take your `Stock` class and modify it so that the cost calculation works like this:
```python
@@ -338,8 +338,8 @@ verify that new attributes can't be added:
>>>
```
When you use `__slots__`, Python uses a more efficient
internal representation of objects. What happens if you try to
When you use `__slots__`, Python uses a more efficient
internal representation of objects. What happens if you try to
inspect the underlying dictionary of `s` above?
```python
@@ -353,4 +353,4 @@ optimization on classes that serve as data structures. Using slots
will make such programs use far-less memory and run a bit faster.
You should probably avoid `__slots__` on most other classes however.
[Contents](../Contents) \| [Previous (5.1 Dictionaries Revisited)](01_Dicts_revisited) \| [Next (6 Generators)](../06_Generators/00_Overview)
[Contents](../Contents.md) \| [Previous (5.1 Dictionaries Revisited)](01_Dicts_revisited) \| [Next (6 Generators)](../06_Generators/00_Overview)