from pathlib import Path

length = 0
my_list=[]
for i in Path("").glob('*.jpg'):

    if len(i.stem) < 15:
        my_list.append(i.stem)
    if i.stem.count('_')>3:
        my_list.append(i.stem)

with open('to_rename.py','w') as file:
    file.write(str(my_list))