为什么在Python中可以省略某些完全引用的包名称？

Question

I have had this 'not so important' question in many conditions, and the specific question I meet most recently is:

import tensorflow as tf
help(tf.feature_column.numeric_column)

[output]:
Help on function numeric_column in module 
tensorflow.python.feature_column.feature_column: 
...

So, here is my question. The complete reference of

'tf.feature_column.numeric_column'

is

'tensorflow.python.feature_column.feature_column'

according to its docstrings. Why the 'python' package name could be omitted?

I thought that python may be able to find package/module in next hierarchy automatically?

Answer 1

Tensorflow将python模块导入其init.py文件

from tensorflow.python import *