you have not mentioned proper material

[ft10101]

haarcascade_frontalface_default.xml is missing for the python face detector that is among the 20-python projects.
Disappointing

[azhardumac]

haarcascade_frontalface_default.xml is missing for the python face detector that is among the 20-python projects. Disappointing

https://github.com/opencv/opencv/tree/master/data/haarcascades

[MAHENDRA9535]

haarcascades.zip

this is the zip file in which you will find the XML file.

[MAHENDRA9535]

haarcascade_frontalface_
haarcascades.zip
default.xml is missing for the python face detector that is among the 20-python projects. Disappointing