Emulating UNIX command find(1) in Python

find.py

def find_files(base_path, condition):
    return [
        os.path.join(root, file)
        for root, _, files in os.walk(base_path)
        for file in files
        if os.path.exists(os.path.join(root, file))  # probably redundant, just making sure
        if condition(os.path.join(root, file))
    ]

# e.g. find -f -ctime -N
find_files(base_path, lambda file: time() - os.path.getctime(file) < 24*60*60*N)