>>> import tensorflow as tf

>>> tf.__version__
'1.2.0-rc1'

>>> x=tf.placeholder(dtype=float32,shape=[1,2,3,4])
>>> x=tf.placeholder(dtype=tf.float32,shape=[1,2,3,4])

>>> x.shape
TensorShape([Dimension(1), Dimension(2), Dimension(3), Dimension(4)])
>>> x.get_shape()
TensorShape([Dimension(1), Dimension(2), Dimension(3), Dimension(4)])
# 返回tuple

>>> x.shape[2]
Dimension(3)
>>> x.get_shape()[2]
Dimension(3)

# 获取具体维度数值
>>> x.shape[2].value
3
>>> x.get_shape()[2].value
3
# 也可以将TensorShape变量转化为list类型，然后直接按照索引取值
>>> x.shape.as_list()
[1, 2, 3, 4]
>>> x.shape.as_list()
[1, 2, 3, 4]

# 可以与int型数值比较
>>> x.shape[2] == 3
True
>>> x.get_shape()[2] == 3
True