python - 将函数应用于数据框列

Question

我有数据框x，

Please view the x dataframe here

我们希望使用以下函数创建新列，该函数将在开始处添加完整列值并创建新列结束。

import datetime
def date_by_adding_business_days(from_date, add_days):
    business_days_to_add = add_days
    current_date = from_date
    while business_days_to_add > 0:
        current_date += datetime.timedelta(days=1)
        weekday = current_date.weekday()
        if weekday >= 5: # sunday = 6
            continue
        business_days_to_add -= 1
    return current_date

我已经尝试过这个错误，请帮忙。

x['Finish'] = x.apply(date_by_adding_business_days(datetime.date.today(), x['Complete']))

ValueError: The truth value of a Series is ambiguous. Use a.empty, a.bool(), a.item(), a.any() or a.all().

Answer 1

尝试重构您的代码。如果您仅将函数应用于一列，那么您就做错了。此外，由于某种原因，您尝试调用向其传递时间的函数。为什么如果你可以在函数中得到它:

import datetime
def date_by_adding_business_days(add_days):
    business_days_to_add = add_days
    current_date = datetime.date.today()
    while business_days_to_add > 0:
        current_date += datetime.timedelta(days=1)
        weekday = current_date.weekday()
        if weekday >= 5: # sunday = 6
            continue
        business_days_to_add -= 1
    return current_date

x['Finish'] = x['Complete'].apply(date_by_adding_business_days)