Trying to print the first high value from yahoo stock data, getting “At based indexing on an non-integer index can only have non-integer indexers”

Question

I'm trying to write a simple test program to get the high prices of stock data from yahoo. I am getting the data and can display the dataframe with all the information just fine.

But when I try to get the first high price and store it I get the following error:

At based indexing on an non-integer index can only have non-integer indexers

This is the code I'm running:

import pandas_datareader.data as web
import datetime as dt

start=dt.datetime(2018,1,1)
end=dt.datetime(2019,7,1)

df=web.DataReader('BTC-USD', 'yahoo', start, end)
print(df)
h=df.at[1,"High"]   # this line causes the error
print(h)

Answer 1

start = dt.datetime（2018,1,1）v = df.at [start，“ High”]