日期时间与python Pandas中的系列字符串
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datetime to string with series in python pandas
提问by Diego
I need to make this simple thing:
我需要做这个简单的事情:
dates = p.to_datetime(p.Series(['20010101', '20010331']), format = '%Y%m%d')
dates.str
But a get an error. How should I transform from datetime to string
但是一个得到一个错误。我应该如何从日期时间转换为字符串
Thanks in advance
提前致谢
采纳答案by EdChum
There is no straccessor for datetimes and you can't do dates.astype(str)either, you can call applyand use datetime.strftime:
str日期时间没有访问器,您也不能这样做dates.astype(str),您可以调用apply并使用datetime.strftime:
In [73]:
dates = pd.to_datetime(pd.Series(['20010101', '20010331']), format = '%Y%m%d')
dates.apply(lambda x: x.strftime('%Y-%m-%d'))
Out[73]:
0 2001-01-01
1 2001-03-31
dtype: object
You can change the format of your date strings using whatever you like: strftime() and strptime() Behavior.
您可以使用任何您喜欢的方式更改日期字符串的格式:strftime() 和 strptime() Behavior。
Update
更新
As of version 0.17.0you can do this using dt.strftime
从版本开始,0.17.0您可以使用dt.strftime
dates.dt.strftime('%Y-%m-%d')
will now work
现在可以工作
回答by Kamil Sindi
回答by Qing Xia
There is a pandas function that can be applied to DateTime index in pandas data frame.
有一个 pandas 函数可以应用于 pandas 数据框中的 DateTime 索引。
date = dataframe.index #date is the datetime index
date = dates.strftime('%Y-%m-%d') #this will return you a numpy array, element is string.
dstr = date.tolist() #this will make you numpy array into a list
the element inside the list:
列表中的元素:
u'1910-11-02'
You might need to replace the 'u'.
您可能需要替换“u”。
There might be some additional arguments that I should put into the previous functions.
可能有一些额外的参数我应该放入之前的函数中。

