Pycharm中的jupyter显示“{ "cells": [ { "cell_type": "code",”，怎么办

我安装了Pycharm pro（2019.07），也用anaconda安装了python和jupyter。
但是我打开try.ipynb文件，会显示如下（正常应该是[1]cell:_____）。不知哪位大神可以指点一下？
```
{
"cells": [
{
"cell_type": "code",
"execution_count": null,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"\n"
]
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 3",
"language": "python",
"name": "python3"
},
"language_info": {
"codemirror_mode": {
"name": "ipython",
"version": 2
},
"file_extension": ".py",
"mimetype": "text/x-python",
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython2",
"version": "2.7.6"
}
},
"nbformat": 4,
"nbformat_minor": 0
}
```