推荐学习书目
› Learn Python the Hard Way
Python Sites
› PyPI - Python Package Index
› http://diveintopython.org/toc/index.html
› Pocoo
值得关注的项目
› PyPy
› Celery
› Jinja2
› Read the Docs
› gevent
› pyenv
› virtualenv
› Stackless Python
› Beautiful Soup
› 结巴中文分词
› Green Unicorn
› Sentry
› Shovel
› Pyflakes
› pytest
Python 编程
› pep8 Checker
Styles
› PEP 8
› Google Python Style Guide
› Code Style from The Hitchhiker's Guide
这是一个创建于 2896 天前的主题，其中的信息可能已经有所发展或是发生改变。
python 中 id([1]) == id([2]) 为 True,这是为啥啊
 |
1
czheo 2017-01-21 11:28:23 +08:00  1
性能优化，内部把 list 重用了吧。
|
 |
2
imn1 2017-01-21 11:31:24 +08:00
id([1]) is id([2])
|
|
4
czheo 2017-01-21 11:46:26 +08:00
tuple 是 immutable 的，没法重用
|
 |
6
bxb100 OP @czheo list 是临时对象，内存会自动清理， tuple 不会，而且 ()和(1)存放地址区域不同
|
 |
7
HypoChen 2017-01-21 19:20:03 +08:00 1
id(object)
Return the “ identity ” of an object. This is an integer (or long integer) which is guaranteed to be unique and constant for this object during its lifetime. **Two objects with non-overlapping lifetimes may have the same id() value.** ``` >>> id([1]) 4391579520 >>> id([2]) 4391579520 >>> a = [1] >>> b = [1] >>> id([1]) 4391757944 >>> id([2]) 4391757944 >>> id(a) 4391579520 >>> id(b) 4391641672 >>> id([]) 4391757944 ``` |
Select Language