Rename files in current and subdirectories!

rename.py

import pathlib

def main():
    path = pathlib.Path.cwd()
    for i in path.glob('**/*'):
        if ' ' in i.name:
            print(i,i.name)
            new_name = i.parent / i.name.replace(' ','_')
            i.rename(new_name)                         
                                                               
if __name__ == '__main__':                                     
    main()