[英]How to convert year-month-day to just years in python?
So I have this column in a dataframe that has 4896 rows of datatimes in this shape:所以我在 dataframe 中有这个列,它有 4896 行这种形状的数据时间:
2018-10-24
2014-04-10
2008-05-21
...
And I would like to transform or convert this data to years only (like 2018.15) -> convert the day and month to year time and have only the years!我只想将这些数据转换或转换为年(如 2018.15)-> 将日和月转换为年时间并且只有年!
How can I do so??我怎么能这样做? Thank you so much!!
太感谢了!!
In: 2018-10-24
Out: 2018.56 (for example)
Using just base Python (as you didn't specify that you have a pandas dataframe - pandas has specific functions to perform calculations with datetime objects):仅使用基数 Python(因为您没有指定您有一个 pandas dataframe - pandas 具有使用日期时间对象执行计算的特定函数):
from datetime import datetime
#takes as arguments the date as a string and an optional format string
def floatyear(str, fmtstr="%Y-%m-%d"):
t = datetime.strptime(str, fmtstr)
t_first = datetime(t.year, 1, 1, 0, 0, 0)
t_last = datetime(t.year, 12, 31, 0, 0, 0)
return t.year + ((t-t_first).days/(t_last-t_first).days)
print(floatyear("2018-10-24", "%Y-%m-%d"))
Sample output:样本 output:
2018.8131868131868
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