无法在Conda环境ubuntu 16.04 python 3.6.4中导入tensorflow

Unable to import tensorflow in Conda environment ubuntu 16.04 python 3.6.4

我是tensorflow的新手。我通过以下步骤安装了tensorflow：

$ conda create -n tensorflow pip python=3.6
$ source activate tensorflow (tensorflow)
$ pip install --ignore-installed --upgrade \
https://storage.googleapis.com/tensorflow/linux/cpu/tensorflow-1.8.0-cp36-cp36m-linux_x86_64.whl(C.P.U. only)

但是当我尝试运行以下程序时：

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import tensorflow as tf
hello=tf.constant("Hello,TensorFlow!")
sess=tf.Session()
print=(sess.run(hello))

我在spyder中收到此错误：

ModuleNotFoundError: No module named 'tensorflow'

而，python终端我收到此错误：

2018-05-16 13:54:34.054511: I
tensorflow/core/platform/cpu_feature_guard.cc:140] Your CPU supports
instructions that this TensorFlow binary was not compiled to use:
SSE4.1 SSE4.2 AVX AVX2 FMA.

任何人都可以告诉我可能的原因是什么？