Jupyter notebook中import seaborn无效果

请问大家一个问题哈
为什么我import seaborn之后画的图还是和原来一样呢？所有包都已经装好了，正常运行无报错，系统环境是macOS Mojave 10.14.1， Python 3.7
代码如下，求指导，谢谢：

%matplotlib inline
import matplotlib.pyplot as plt
import matplotlib as mpl
import numpy as np
import pandas as pd
import tushare as ts

data = ts.get_k_data('600030', start = '2010-01-01', end='2017-06-30') 

data['close'].plot()

import seaborn as sns

data['close'].plot()

已解决
import seaborn as sns
sns.set()
data['close'].plot()

加上sns.set()，看别人直接import好用，不过我没试出来