Python 根据日期范围列生成天数行

我有一个csv文件由两列（周和数据）和100行组成。 看起来像这样：

周
资料
2009-01-04 - 2009-01-10
一些数据

import datetime
from dateutil.parser import parse as parse_date
from pandas import DataFrame

df = DataFrame([['2009-01-04 - 2009-01-10','Some Data'], 
                ['2009-01-11 - 2009-01-17','Some Data']])
df.columns = ['week','data']

def generate_dates(date_range):
    day1_str, day2_str = date_range.split(' - ')
    day1, day2 = parse_date(day1_str), parse_date(day2_str)
    delta = day1 - day2
    return [day1 + datetime.timedelta(days=x) for x in range(0, abs(delta.days + 1))]

def create_rows_from_row(row):
    dates = generate_dates(row['week'])
    return [[d, row['data']] for d in dates]

def create_new_df(df):
    rows = []
    for idx in range(len(df)):
        rows.extend(create_rows_from_row(df.ix[idx]))

    new_df = DataFrame(rows)
    new_df.columns = ['week','data']
    return new_df

create_new_df(df)