indicators.py

# select Life expectancy for females for all countries in 2013
hist_indicator =  'Life expectancy at birth'
hist_year = 2013

mask1 = data['IndicatorName'].str.contains(hist_indicator) 
mask2 = data['Year'].isin([hist_year])

# apply our mask
stage = data[mask1 & mask2]
stage.head()

#Creating a data frame with just the country codes and the values we want plotted.
data_to_plot = stage[['CountryCode','Value']]
data_to_plot.head()

# labelling the legend
hist_indicator = stage.iloc[0]['IndicatorName']