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I have a pandas dataframe that contains a date column. I would like to add another column called day_of_week to this df that tells the day of the week in German. Based on this answer, I understand that I can do this by using the Babel package.

>>> from datetime import date, datetime, time
>>> from babel.dates import format_date, format_datetime, format_time

>>> d = date(2007, 4, 1)
>>> format_date(d, locale='en')
u'Apr 1, 2007'
>>> format_date(d, locale='de_DE')
u'01.04.2007'

However, when I try to apply this to a pandas dataframe column, I get an AssertionError::

df['day_of_week'] = format_date(df['date'], "E", locale='de_DE')

Does anyone have an idea how to fix this?

sampeterson
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1 Answers1

1

Use apply:

df['day_of_week'] = df['date'].apply(format_date, format='E', locale='de_DE')
print(df)

# Output
        date day_of_week
0 2022-01-28         Fr.
1 2022-01-29         Sa.
2 2022-01-30         So.
3 2022-01-31         Mo.
4 2022-02-01         Di.
5 2022-02-02         Mi.
6 2022-02-03         Do.
7 2022-02-04         Fr.
8 2022-02-05         Sa.
9 2022-02-06         So.

Setup:

df = pd.DataFrame({'date': pd.date_range('2022-1-28', '2022-2-6')})
print(df)

# Output
        date day_of_week
0 2022-01-28         Fr.
1 2022-01-29         Sa.
2 2022-01-30         So.
3 2022-01-31         Mo.
4 2022-02-01         Di.
5 2022-02-02         Mi.
6 2022-02-03         Do.
7 2022-02-04         Fr.
8 2022-02-05         Sa.
9 2022-02-06         So.

As a suggestion with locales:

import locale

locale.setlocale(locale.LC_TIME, 'de_DE.UTF-8')  # Linux
locale.setlocale(locale.LC_TIME, 'German')  # Windows

df['day_of_week'] = pd.to_datetime(df['date']).dt.strftime('%a.')
Corralien
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