Oh, and when you do bail out and go to Python, marcel's operators are available in a module (marcel.api), so that you can take your pipeline and move it into Python easily. E.g. here's the same example in Python:

    from marcel.api import *

    for path, line in (ls(file=True, recursive=True) |
                       select(lambda f: f.suffix == '.py' and 
                              now() - f.mtime < days(1)) |
                       read(label=True) |
                       select(lambda path, line: line.startswith('class '))):
        print(f'({path}: {line})
                       read(label=True)