tushare 股票数据获取，收益率计算，直方图绘制

array转化为list，空值处理

# hanbb
# come on!!!
import tushare as ts
import matplotlib.pyplot as plt

# 股票数据获取
data = ts.get_hist_data(\'000001\',start=\'2015-06-23\',end=\'2017-11-16\')

# 收益率计算
data[\'returns\'] = (data[\'close\']-data[\'close\'].shift(1))/data[\'close\'].shift(1)

returns = data["returns"].values
returns_list = returns.tolist()  # 将array 转化为lsit
returns_list = returns_list[1:]  # 舍去空值

# 绘制直方图
plt.hist(returns_list)
plt.show()