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Python的3.0版本,常被称为Python 3000,或简称Py3k。相对于Python的早期版本,这是一个较大的升级。
为了不带入过多的累赘,Python 3.0在设计的时候没有考虑向下相容。
许多针对早期Python版本设计的程式都无法在Python 3.0上正常执行。
为了照顾现有程式,Python 2.6作为一个过渡版本,基本使用了Python 2.x的语法和库,同时考虑了向Python
3.0的迁移,允许使用部分Python 3.0的语法与函数。
新的Python程式建议使用Python 3.0版本的语法。
大多数第三方库都正在努力地相容Python 3.0版本。即使无法立即使用Python 3.0,也建议编写相容Python
3.0版本的程式,然后使用Python 2.6, Python 2.7来执行。
知识点扩充:
Python2与Python3的选择:
因为早期的 Python版本在基础方面设计存在着一些不足之处。2008 年的时候 Guido van Rossum 又重新开发 Python
3.0(被称为Python 3000,或简称Py3k),Python3在设计的时候很好地解决了这些遗留问题, 并且在性能上也有了一定的提升,。
所以,两个版本就进入了长期并行开发和维护的状态。但是就更新速度来说
,Python3更新速度远快于Python2的速度,因为Python2目前主要以维护为主。Python3是未来的趋势。