python指定した日付範囲の毎日、毎月、四半期ごとに取得

def getBetweenDay(begin_date):
    date_list = []
    begin_date = datetime.datetime.strptime(begin_date, "%Y-%m-%d")
    end_date = datetime.datetime.strptime(time.strftime('%Y-%m-%d',time.localtime(time.time())), "%Y-%m-%d")
    while begin_date <= end_date:
        date_str = begin_date.strftime("%Y-%m-%d")
        date_list.append(date_str)
        begin_date += datetime.timedelta(days=1)
    return date_list

def getBetweenMonth(begin_date):
    date_list = []
    begin_date = datetime.datetime.strptime(begin_date, "%Y-%m-%d")
    end_date = datetime.datetime.strptime(time.strftime('%Y-%m-%d', time.localtime(time.time())), "%Y-%m-%d")
    while begin_date <= end_date:
        date_str = begin_date.strftime("%Y%m")
        date_list.append(date_str)
        begin_date = add_months(begin_date,1)
    return date_list

def add_months(dt,months):
    month = dt.month - 1 + months
    year = dt.year + month / 12
    month = month % 12 + 1
    day = min(dt.day, calendar.monthrange(year, month)[1])
    return dt.replace(year=year, month=month, day=day)

def getBetweenMonth(begin_date):
    date_list = []
    begin_date = datetime.datetime.strptime(begin_date, "%Y-%m-%d")
    end_date = datetime.datetime.strptime(time.strftime('%Y-%m-%d', time.localtime(time.time())), "%Y-%m-%d")
    while begin_date <= end_date:
        date_str = begin_date.strftime("%Y-%m")
        date_list.append(date_str)
        begin_date = add_months(begin_date,1)
    return date_list

def add_months(dt,months):
    month = dt.month - 1 + months
    year = dt.year + month / 12
    month = month % 12 + 1
    day = min(dt.day, calendar.monthrange(year, month)[1])
    return dt.replace(year=year, month=month, day=day)

def getBetweenQuarter(begin_date):
    quarter_list = []
    month_list = getBetweenMonth(begin_date)
    for value in month_list:
        tempvalue = value.split("-")
        if tempvalue[1] in ['01','02','03']:
            quarter_list.append(tempvalue[0] + "Q1")
        elif tempvalue[1] in ['04','05','06']:
            quarter_list.append(tempvalue[0] + "Q2")
        elif tempvalue[1] in ['07', '08', '09']:
            quarter_list.append(tempvalue[0] + "Q3")
        elif tempvalue[1] in ['10', '11', '12']:
            quarter_list.append(tempvalue[0] + "Q4")
    quarter_set = set(quarter_list)
    quarter_list = list(quarter_set)
    quarter_list.sort()
    return quarter_list