导入

Python 导入模块首先从内置模块查找，再从当前目录查找同名文件，等等。编写代码时，需要规避文件命名，避免冲突。

# datetime.py

print('2049-01-01 12:00')

# a.py

import datetime

print(datetime.datetime.now())

python a.py

报错 module 'datetime' has no attribute 'datetime' ，删除或者重命名文件即可解决问题。

Python 彩蛋，一首诗，其中 Dutch 指创始人 Guido van Rossum 。

import this

The Zen of Python, by Tim Peters

Beautiful is better than ugly.
Explicit is better than implicit.
Simple is better than complex.
Complex is better than complicated.
Flat is better than nested.
Sparse is better than dense.
Readability counts.
Special cases aren't special enough to break the rules.
Although practicality beats purity.
Errors should never pass silently.
Unless explicitly silenced.
In the face of ambiguity, refuse the temptation to guess.
There should be one-- and preferably only one --obvious way to do it.
Although that way may not be obvious at first unless you're Dutch.
Now is better than never.
Although never is often better than *right* now.
If the implementation is hard to explain, it's a bad idea.
If the implementation is easy to explain, it may be a good idea.
Namespaces are one honking great idea -- let's do more of those!