将 Pandas df 中的数据提取到列表中

Question

我有一个 Pandas 数据框 headers 和包含冗余数据的行，我想从中提取。例如，我有一个看起来像这样的 df：

df = pd.DataFrame({'Your availability: Wednesday, December 25th, 2019 5:00AM-6:00AM': ['Wednesday, December 25th, 2019 5:00AM-6:00AM', pd.NaN, pd.NaN, 'Wednesday, December 25th, 2019 5:00AM-6:00AM'],
                'Your availability: Tuesday, December 10th 2019 8:00AM-5:00PM': [pd.NaN, 'Tuesday, December 10th 2019 8:00AM-5:00PM', pd.NaN, pd.NaN]})

...我想提取日期并将其放入字典以供参考：

datetimes = {'P1': "Wednesday, December 25th, 2019 5:00AM-6:00AM", 'P2' : "Tuesday, December 10th 2019 8:00AM-5:00PM", 'P3': NaN, 'P4': "Wednesday, December 25th, 2019 5:00AM-6:00AM}

Answer 1

是不是你想要的：

df.drop_duplicates().stack().to_list()

输出：

['Wednesday, December 25th, 2019 5:00AM-6:00AM',
 'Tuesday, December 10th 2019 8:00AM-5:00PM']

Answer 2

IIUC，试试这个

df.ffill(1).iloc[:,-1].rename(lambda x: f'P{x+1}').to_dict()

Out[1159]:
{'P1': 'Wednesday, December 25th, 2019 5:00AM-6:00AM',
 'P2': 'Tuesday, December 10th 2019 8:00AM-5:00PM',
 'P3': nan,
 'P4': 'Wednesday, December 25th, 2019 5:00AM-6:00AM'}

将 Pandas df 中的数据提取到列表中

Extracting data out of Pandas df into a list

datetime

text-extraction

list

python-3.x

pandas