geta_data and plot_data from which python module are functions?

I'm trying to use the following script, which uses a module called "util"

import pandas as pd
import matplotlib.pyplot as plt
since use import get_data, plot_data
# Read the data
dates = pd.date_range ("2009-01-01", "2012-12-31")
symbols = ["SPY"]
df = get_data (symbols, dates)
plot_data (df)

I recover the error

> ModuleNotFoundError: no module named & # 39; util & # 39;

Thinking that the module "useful" could be obsolete for Python 3, I install the module "python_utils", and with the same script

import pandas as pd
import matplotlib.pyplot as plt
from python_utils import get_data, plot_data
# Read the data
dates = pd.date_range ("2009-01-01", "2012-12-31")
symbols = ["SPY"]
df = get_data (symbols, dates)
plot_data (df)

I receive the error

mportError: can not import the name 'get_data'

In which Python module are these functions?