there is a typo: plt.plot(K, distortions, 'bx-') should be replaced with plt.plot(K, WCSS, 'bx-')

sns.load_dataset(name='car_crashes'....) loads data from a special repository https://github.com/mwaskom/seaborn-data in this repository there are tons of csv-files, including car_crashes.csv

some folders and files are special and starting with the point, e.g. '.git' i use the following script to ignore point-starting files and folder: import os for file in os.listdir(): # split into base name and extension name , ext = os.path.splitext(file) if name [ 0 ]!=".": print("%20s %5s" %( name ,ext))

Queue is actually Stack