title: Python how to plot a frequency pie chart with one column using plotly.express
body: <p>I have a data frame and I only want to plot the frequency of one column, for example, the count of cars of different brands. Cars: [FORD, FORD, BMW, GMC, GMC, GMC, GMC.....] I want to plot them in pie charts of any suitable graphs, without using matplotlib.</p>
  <p>I tried to create pivot tables, which are like Ford: 4, Chevy: 3, BMW: 5, GMC: 10. but I don't know how to access the column labels and I can't use them in plotly.</p>