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Pie Charts nor Viewable today

Hello! I’m not too sure what I’m doing wrong with my below code. Everything was working fine yesterday I was able to view my 2 pie charts in a browser and see valid data. Today nothing is pulling up in a browser. I Regenerated my API key and reinstalled plot.ly. Any help would be great!

def plot_events_by_formats(format_events):
    labels = []
    values = []
    for each in format_events:
        labels.append(each)
        value = format_events[each]
        values.append(len(value))

    trace = go.Pie(labels=labels, values=values)
    py.plot([trace], filename='Events by Formats')

def plot_events_by_categories(category_events):
    labels = []
    values = []
    for each in category_events:
        labels.append(each)
        value = category_events[each]
        values.append(len(value))

    trace = go.Pie(labels=labels, values=values)
    py.plot([trace], filename='Events by Categories')


show_events_by_formats(format_events_)
show_events_by_categories(category_events_)
try:
    plot_events_by_formats(format_events_)
    plot_events_by_categories(category_events_)
except:
    print("Error in using plotly, Please follow instructions in Readme.md")