摘要：
with statement Here is the syntax of the with statement: with expression as var: statements The expression should be a context manager object, or it s
阅读全文
posted @ 2024-07-31 21:50
ZhangZhihuiAAA
阅读(27)
推荐(0)
摘要：
Figure 20.4: Built-in exceptions The class BaseException is the base class of all the built-in exception classes. From BaseException, four classes nam
阅读全文
posted @ 2024-07-31 21:03
ZhangZhihuiAAA
阅读(33)
推荐(0)
摘要：
There are two approaches that can be followed when we want to deal with exceptions that occur due to unusual events: LBYL - Look Before You Leap EAFP
阅读全文
posted @ 2024-07-31 20:48
ZhangZhihuiAAA
阅读(18)
推荐(0)
摘要：
>>> list(map(lambda x, y: x * y, [1,2,3,4], [5,6,7,8])) [5, 12, 21, 32] Here we have called the map function and sent a lambda expression as first arg
阅读全文
posted @ 2024-07-31 20:13
ZhangZhihuiAAA
阅读(15)
推荐(0)
摘要：
Functional programming is a programming paradigm in which most of the work in a program is done using pure functions. A pure function is a function wi
阅读全文
posted @ 2024-07-31 17:23
ZhangZhihuiAAA
阅读(21)
推荐(0)
摘要：
We can place lambda function inside list and dictionary literals. This way we can use lambda expressions to create jump tables. >>> L = [lambda s: s.s
阅读全文
posted @ 2024-07-31 17:11
ZhangZhihuiAAA
阅读(21)
推荐(0)
摘要：
A closure is a nested function that can access free variables from an enclosing function even after it has finished its execution. We know that, like
阅读全文
posted @ 2024-07-31 17:08
ZhangZhihuiAAA
阅读(17)
推荐(0)
摘要：
We have used functions to decorate functions and to decorate classes. Now, we will see how to define a class as a decorator. At the start of this chap
阅读全文
posted @ 2024-07-31 16:24
ZhangZhihuiAAA
阅读(19)
推荐(0)
摘要：
When we talk about decorating classes, we can either decorate individual methods or we can create a decorator to decorate the whole class. class MyCla
阅读全文
posted @ 2024-07-31 15:28
ZhangZhihuiAAA
阅读(15)
推荐(0)
摘要：
A decorator is a callable that takes a callable as input and returns a callable. This is the general definition of a decorator. The callable in this d
阅读全文
posted @ 2024-07-31 15:19
ZhangZhihuiAAA
阅读(12)
推荐(0)
摘要：
The task of implementing iterators can be simplified by using generators. We have seen how to create custom iterators using the object-oriented way, i
阅读全文
posted @ 2024-07-31 11:20
ZhangZhihuiAAA
阅读(30)
推荐(0)
摘要：
The itertools module contains special functions to create iterators for efficient looping. It has three broad categories of iterators - infinite itera
阅读全文
posted @ 2024-07-31 10:40
ZhangZhihuiAAA
阅读(11)
推荐(0)
摘要：
If we want objects of this class to be used in iteration contexts, then they should support the iteration protocol. To make this class iterable, we ca
阅读全文
posted @ 2024-07-31 10:33
ZhangZhihuiAAA
阅读(8)
推荐(0)
摘要：
In our first example, we will create iterable objects, which, when iterated over, will give out cubes of numbers, and these objects will support multi
阅读全文
posted @ 2024-07-31 10:29
ZhangZhihuiAAA
阅读(14)
推荐(0)
摘要：
There are many built-in functions and methods that return iterables and iterators. Here are a few examples: range() returns an iterable dict.keys() re
阅读全文
posted @ 2024-07-31 09:43
ZhangZhihuiAAA
阅读(14)
推荐(0)
摘要：
class Engine: def __init__(self,power): self.power = power def start(self): self.draw_current() self.spin() self.ignite() def draw_current(self): prin
阅读全文
posted @ 2024-07-31 09:34
ZhangZhihuiAAA
阅读(9)
推荐(0)
摘要：
We have seen that if we have to define a group of classes that have similar features and show common behavior, we can define a base class and then inh
阅读全文
posted @ 2024-07-31 09:30
ZhangZhihuiAAA
阅读(12)
推荐(0)
摘要：
The three main features of object-oriented programming are - encapsulation, inheritance and polymorphism. We have seen the first two, now let us see w
阅读全文
posted @ 2024-07-31 09:19
ZhangZhihuiAAA
阅读(20)
推荐(0)
浙公网安备 33010602011771号
浙ICP备2021040463号-3
