Printing a week range string in Python
You have a bug: if dt is a Sunday, then it outputs the date range starting from the previous Sunday.  That is because datetime.isocalendar() represents the day of week as a number from 1 (= Monday) to 7 (= Sunday), but you want to subtract 0 to 6 days.


&gt;&gt;&gt; print week_string(date(2014, 01, 19))
Jan 12 - 18, 2014



My recommendation:

def week_string(dt):
    # Use underscore to indicate disinterest in the year and week
    _, _, weekday = dt.isocalendar()
    week_0 = dt - timedelta(days=weekday % 7)  # Sunday
    week_1 = week_0 + timedelta(days=6)        # Saturday


Then, I would write the following six lines more compactly:

    day_0, month_0, year_0 = week_0.strftime('%e-%b-%Y').lstrip().split('-')
    day_1, month_1, year_1 = week_1.strftime('%e-%b-%Y').lstrip().split('-')


The rest of it seems fine.