How to use DataAPI in python?

Question

Recently, I have encountered a code segment

import numpy as np
from sklearn.svm import SVR
import matplotlib.pyplot as plt
import time
import DataAPI

start='20160101'
end='20170101'
code='600000'
df=DataAPI.MktEqudAdjAfGet(ticket=code,beginData=start,endDate=end,filed=u'tradeDate,closePrice',pandas=1)
df=df.set_index('tradeDate').copy()

I don't know where does

DataAPI.MktEqudAdjAfGet(ticket=code,beginData=start,endDate=end,filed=u'tradeDate,closePrice',pandas=1)

come from . How to import this package so that the code can run ? I have try

 pip install DataAPI

but When I try to import this package, the error below showed up The error is 'No module named pyfin'.

And then I try to

pip install pyfin

But the result is that I have already possessed this package and up-to-date.