Not an exhaustive list of possible reasons: - (number_of_people_who_enjoy_coding_with_python_more_than_coding_with_c_sharp_or_java > 0) == True - Some people

Not an exhaustive list of possible reasons: - (number_of_people_who_enjoy_coding_with_python_more_than_coding_with_c_sharp_or_java > 0) == True - Some people have large existing codebases, and would rather add types gradually than have to port all their logic to another language. - In terms of being free and open source, Python > C# > Java (meta: can you even do a comparison like that in C# and/or Java?)