April 2023
Intermediate to advanced
769 pages
25h 16m
Chinese
Content preview from 流畅的Python（第2版）
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684
｜
第
23
章
在示例
23-8
中，每个
__get__
方法和
__set__
方法都调用了
print_args
函
数，目的是以一种更易读的方式显示调用过程。没必要理解
print_args
函数
及辅助函数
cls_name
和
display
，不要花心思研究它们。
示例
23-8
descriptorkinds.py
：用于研究描述符覆盖行为的几个简单的类
### 辅助函数，仅用于显示 ###
def cls_name(obj_or_cls):
cls = type(obj_or_cls)
if cls is type:
cls = obj_or_cls
return cls.__name__.split('.')[-1]
def display(obj):
cls = type(obj)
if cls is type:
return f'<class {obj.__name__}>'
elif cls in [type(None), int]:
return repr(obj)
else:
return f'<{cls_name(obj)} object>'
def print_args(name, *args):
pseudo_args = ', '.join(display(x) for x in args)
print(f'-> {cls_name(args[0])}.__{name}__({pseudo_args})')
### 对这个示例重要的类
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.