capybara/virtualenv/lib/python2.7/site-packages/wheel/metadata.py
def unique(iterable):
    """
    Yield unique values in iterable, preserving order.
    """
    seen = set()
    for value in iterable:
        if not value in seen:
            seen.add(value)
            yield value
def unique(iterable):
    """
    Yield unique values in iterable, preserving order.
    """
    seen = set()
    for value in iterable:
        if not value in seen:
            seen.add(value)
            yield value
Yield unique values in iterable, preserving order.