Python idioms, 2 of n

最新推荐文章于 2023-09-20 22:15:39 发布

原创最新推荐文章于 2023-09-20 22:15:39 发布 · 1.3k 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#idioms #python #variables #object #class

Python 专栏收录该内容

52 篇文章

订阅专栏

本文详细阐述了在类的初始化方法中不应进行琐碎赋值的原理，并提供了替代方案。通过对比传统方法与改进后的实践，旨在提高代码效率与可维护性。同时，文章还强调了合理使用条件表达式语法的重要性，以增强代码的清晰度和可读性。

1) Don't do trivial assignment in __init__ of the class
Don't:
class Foo(object):
    def __init__(self):
        self.attr1 = 0
        self.attr2 = ''
        self.attr3 = []
        self.attr4 = {}

Do:
class Foo(object):   // Define the member variables when first used in the code
    def __init__(self):
        ...

2)
Try coding like this:
for work_request in iter(queue.get, sentinel):
process_work_request(work_request)

Compare:
while True:
work_request = queue.get()
if work_request == sentinel:
break
process_work_request(work_request)

3) Always put parentheses around "conditoinal expression"
x = (true_value if condition else false_value)
Refer to
http://www.python.org/dev/peps/pep-0308/