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pythonyahoo-finance

NameError: name 'HTMLSession' is not defined when calling yahoo_fin.options.get_expiration_dates()

I'm calling yahoo_fin.options.get_expiration_dates() from a very simple code, such that it's unlikely that I have loaded other modules with the same name.

My whole code is this:

import matplotlib.pyplot as plt
import pandas as pd

from numpy import *
from yahoo_fin import options

plt.style.use("seaborn")

expirationDates = options.get_expiration_dates("goog")

The output of the last line is:

NameError: name 'HTMLSession' is not defined

Can you help me understand what's going on?

Solution

  • yahoo_fin requires requests-html for a few of its functions, including the yahoo_fin.options.get_expiration_dates method. You can install it using pip (it requires Python 3.6+):

    pip install requests-html

    Once installed, you need to restart your Python session. This link provides information on what functionality requires requests-html.