Rename files & folders in current directory

rename_files.py

# In IPython, you can change the current working directory using
# %cd /path/to/some/directory/

import os
from pathlib import Path

# Directory containing folders you want to rename
here = Path(".")  # "." means "the current directory"

# Loop through all the folders & files in this directory
for current_name in os.listdir():
    # Remove spaces & lowercase
    new_name = current_name.replace(" ", "_").lower()
    # Rename each file/folder
    os.rename(here / current_name, here / new_name)