我找不到这个问题的确切解决方案，所以我将发布我的解决方案，以防使用标准日历和datetime库可能有任何帮助。这适用于添加和减去月份，并考虑月末滚动和最后一个月比第一个月天数少的情况。如果你正在寻找更复杂的操作，我还有一个更通用的解决方案，它添加了定期间隔(天，月，年，季度，学期等)，如:“1m”，“-9m”，“-1.5y”，“-3q”，“1s”等。

from datetime import datetime
from calendar import monthrange
def date_bump_months(start_date, months):
    """
    bumps months back and forth. 
    --> if initial date is end-of-month, i will move to corresponding month-end
    --> ir inital date.day is greater than end of month of final date, it casts it to momth-end
    """
    signbit = -1 if months < 0 else 1
    d_year, d_month = divmod(abs(months),12)    
    end_year = start_date.year + d_year*signbit 
    end_month = 0
    if signbit ==-1:            
        if d_month < start_date.month:
            end_month = start_date.month - d_month
        else:
            end_year -=1
            end_month = 12 - (d_month - start_date.month)
    else:
        end_month +=start_date.month
        if end_month  > 12:
            end_year +=1
            end_month -=12
    # check if we are running end-of-month dates
    eom_run = monthrange(start_date.year, start_date.month)[1]==start_date.day
    eom_month = monthrange((end_year), (end_month))[1]
    if eom_run:
        end_day = eom_month 
    else:
        end_day = min(start_date.day, eom_month )    
    return date(end_year, end_month, end_day)

我找不到这个问题的确切解决方案，所以我将发布我的解决方案，以防使用标准日历和datetime库可能有任何帮助。这适用于添加和减去月份，并考虑月末滚动和最后一个月比第一个月天数少的情况。如果你正在寻找更复杂的操作，我还有一个更通用的解决方案，它添加了定期间隔(天，月，年，季度，学期等)，如:“1m”，“-9m”，“-1.5y”，“-3q”，“1s”等。

from datetime import datetime
from calendar import monthrange
def date_bump_months(start_date, months):
    """
    bumps months back and forth. 
    --> if initial date is end-of-month, i will move to corresponding month-end
    --> ir inital date.day is greater than end of month of final date, it casts it to momth-end
    """
    signbit = -1 if months < 0 else 1
    d_year, d_month = divmod(abs(months),12)    
    end_year = start_date.year + d_year*signbit 
    end_month = 0
    if signbit ==-1:            
        if d_month < start_date.month:
            end_month = start_date.month - d_month
        else:
            end_year -=1
            end_month = 12 - (d_month - start_date.month)
    else:
        end_month +=start_date.month
        if end_month  > 12:
            end_year +=1
            end_month -=12
    # check if we are running end-of-month dates
    eom_run = monthrange(start_date.year, start_date.month)[1]==start_date.day
    eom_month = monthrange((end_year), (end_month))[1]
    if eom_run:
        end_day = eom_month 
    else:
        end_day = min(start_date.day, eom_month )    
    return date(end_year, end_month, end_day)

PyQt4的QDate类有一个addmonths函数。

>>>from PyQt4.QtCore import QDate  
>>>dt = QDate(2009,12,31)  
>>>required = dt.addMonths(6) 

>>>required
PyQt4.QtCore.QDate(2010, 6, 30)

>>>required.toPyDate()
datetime.date(2010, 6, 30)

使用Python 3。X你可以这样做:

from datetime import datetime, timedelta
from dateutil.relativedelta import *

date = datetime.now()
print(date)
# 2018-09-24 13:24:04.007620

date = date + relativedelta(months=+6)
print(date)
# 2019-03-24 13:24:04.007620

但是你需要安装python-dateutil模块:

pip install python-dateutil

我对Tony Diep的答案的修改，可能稍微更优雅(当然，Python 2，匹配问题和原始答案的日期，对于Python 3，必要时修改，至少包括/ to //):

def add_months(date, months):
    month = date.month + months - 1
    year = date.year + (month / 12)
    month = (month % 12) + 1
    day = date.day
    while (day > 0):
        try:
            new_date = date.replace(year=year, month=month, day=day)
            break
        except:
            day = day - 1    
    return new_date

根据“业务需求”解释添加月份，即日期映射到月底之后，应该映射到月底，而不是下一个月。

这个怎么样?没有使用其他库(dateutil)或timedelta? 基于vartec的回答，我这样做了，我相信它是有效的:

import datetime

today = datetime.date.today()
six_months_from_today = datetime.date(today.year + (today.month + 6)/12, (today.month + 6) % 12, today.day)

我尝试使用timedelta，但因为它是计算天数的，365/2或6*356/12并不总是转换为6个月，而是182天。如。

day = datetime.date(2015, 3, 10)
print day
>>> 2015-03-10

print (day + datetime.timedelta(6*365/12))
>>> 2015-09-08

我相信我们通常会假设某一天的6个月将在6个月后的同一天登陆(即2015-03-10—> 2015-09-10，而不是2015-09-08)

我希望这对你有帮助。