Mini Shell

from contextlib import contextmanager


@contextmanager
def monkeypatch(obj, attribute_name, new_value):
    """
    Like pytest's monkeypatch, but as a value manager.
    """
    old_value = getattr(obj, attribute_name)
    try:
        setattr(obj, attribute_name, new_value)
        yield
    finally:
        setattr(obj, attribute_name, old_value)


def indent_block(text, indention='    '):
    """This function indents a text block with a default of four spaces."""
    temp = ''
    while text and text[-1] == '\n':
        temp += text[-1]
        text = text[:-1]
    lines = text.split('\n')
    return '\n'.join(map(lambda s: indention + s, lines)) + temp