Python date replace()用法及代码示例

Python date.replace() 方法

date.replace() 方法用于操作模块 datetime 的日期类对象。

它用于用相同的值替换日期，除了那些由括号中指定的关键字参数赋予新值的参数。它是一个实例方法，这意味着它适用于类的实例。

模块：

    import datetime

类：

    from datetime import date

用法:

    replace(year=self.year, month=self.month, day=self.day)

参数：

• year：实例的新年份值(范围：1 <= 年份 <= 9999)
• month：实例的新月份值(范围：1 <= 月份 <= 12)
• day：实例的新日期(范围：1<= 天 <= 31)

如果值不在给定范围内，则会引发 ValueError。

返回值：

该方法的返回类型是替换参数后的日期类对象。

例：

## Python program explaining the 
## use of date class instance methods

from datetime import date

## Creating an instance
x = date(2019, 9, 25)
print("Current date is:", x)
print()

## Using replace() method 
d = x.replace(year = 2020)
print("New date after changing the year:", d)
print()

d = x.replace(month=1)
print("The date after changing the month:", d)
print()

d = x.replace(day=30)
print("The date after changing the day:", d)
print()

d = x.replace(year=2025, day=30)
print("The date after changing the day and year:", d)
print()

d = x.replace(year= 1999, month =12, day=3)
print("The date after changing the year, month and day:", d)
print()

输出

Current date is:2019-09-25

New date after changing the year:2020-09-25

The date after changing the month:2019-01-25

The date after changing the day:2019-09-30

The date after changing the day and year:2025-09-30

The date after changing the year, month and day:1999-12-03

注意：

如果任何参数超出范围或新日期无效，该方法将显示错误。例如，二月有 28(或 29)天，因此如果您为非闰年输入 29，它将显示 ValueError。

例：

## Python program explaining the 
## use of date class instance methods

from datetime import date

## Creating an instance
x = date(2019, 9, 25)
print("Current date is:", x)
print()

d = x.replace(year = 2020, month =2, day =29)
print("New date:",d)
print()

d = x.replace(year = 2019, month =2, day =29)
print(d)

输出

Current date is:2019-09-25

New date:2020-02-29

Traceback (most recent call last):
  File "main.py", line 15, in <module>
    d = x.replace(year = 2019, month =2, day =29)
ValueError:day is out of range for month

运行时错误：

ValueError：日期超出月份的范围