当我写CSV时，如何将pandas隐藏到unu datetime NaT中？

Question

我有点困惑，为什么NaT会出现在我的CSV中…通常它们会显示为“”。以下是我的日期格式：

df['submitted_on'] = pd.to_datetime(df['submitted_on'], errors='coerce').dt.to_period('d')
df['resolved_on'] = pd.to_datetime(df['resolved_on'], errors='coerce').dt.to_period('d')
df['closed_on'] = pd.to_datetime(df['closed_on'], errors='coerce').dt.to_period('d')
df['duplicate_on'] = pd.to_datetime(df['duplicate_on'], errors='coerce').dt.to_period('d')
df['junked_on'] = pd.to_datetime(df['junked_on'], errors='coerce').dt.to_period('d')
df['unproducible_on'] = pd.to_datetime(df['unproducible_on'], errors='coerce').dt.to_period('d')
df['verified_on'] = pd.to_datetime(df['verified_on'], errors='coerce').dt.to_period('d')

当我测向头（）这是我的结果。很好，很好，一切都很好。在

^{pr2}$

但我写信给CSV，NaT出现了：

"identifier","status","submitted_on","resolved_on","closed_on","duplicate_on","junked_on","unproducible_on","verified_on"
"xx1","D","2004-07-28","NaT","NaT","2004-08-26","NaT","NaT","NaT"
"xx2","N","2010-03-02","NaT","NaT","NaT","NaT","NaT","NaT"
"xx3","U","2005-10-26","NaT","NaT","NaT","NaT","2005-11-01","NaT"
"xx4","V","2006-06-30","2006-09-15","NaT","NaT","NaT","NaT","2006-11-20"
"xx5","R","2012-09-21","2013-06-06","NaT","NaT","NaT","NaT","NaT"
"xx6","D","2009-11-25","NaT","NaT","2010-02-26","NaT","NaT","NaT"
"xx7","D","2003-08-29","NaT","NaT","2003-08-29","NaT","NaT","NaT"
"xx8","R","2003-06-06","2003-06-24","NaT","NaT","NaT","NaT","NaT"
"xx9","R","2004-11-05","2004-11-15","NaT","NaT","NaT","NaT","NaT"
"xx10","R","2008-02-21","2008-09-25","NaT","NaT","NaT","NaT","NaT"
"xx11","R","2007-03-08","2007-03-21","NaT","NaT","NaT","NaT","NaT"
"xx12","R","2011-08-22","2012-06-21","NaT","NaT","NaT","NaT","NaT"
"xx13","J","2003-07-07","NaT","NaT","NaT","2003-07-10","NaT","NaT"
"xx14","A","2008-09-24","NaT","NaT","NaT","NaT","NaT","NaT"

所以，我做了我认为可以解决问题的方法。df.fillna('', inplace=True)和nada。然后，我尝试了df.replace(pd.NaT, '')，但没有结果，然后是{}，当我写CSV时，也没有得到想要的输出。我应该用什么来阻止NaT被转录成CSV？在

样本数据：

"identifier","status","submitted_on","resolved_on","closed_on","duplicate_on","junked_on","unproducible_on","verified_on"
"xx1","D","2004-07-28 07:00:00.0","null","null","2004-08-26 07:00:00.0","null","null","null"
"xx2","N","2010-03-02 03:00:16.0","null","null","null","null","null","null"
"xx3","U","2005-10-26 14:20:20.0","null","null","null","null","2005-11-01 13:02:22.0","null"
"xx4","V","2006-06-30 07:00:00.0","2006-09-15 07:00:00.0","null","null","null","null","2006-11-20 08:00:00.0"
"xx5","R","2012-09-21 06:30:58.0","2013-06-06 09:35:25.0","null","null","null","null","null"
"xx6","D","2009-11-25 02:16:03.0","null","null","2010-02-26 12:28:22.0","null","null","null"
"xx7","D","2003-08-29 07:00:00.0","null","null","2003-08-29 07:00:00.0","null","null","null"
"xx8","R","2003-06-06 12:00:00.0","2003-06-24 12:00:00.0","null","null","null","null","null"
"xx9","R","2004-11-05 08:00:00.0","2004-11-15 08:00:00.0","null","null","null","null","null"
"xx10","R","2008-02-21 05:13:39.0","2008-09-25 17:20:57.0","null","null","null","null","null"
"xx11","R","2007-03-08 17:47:44.0","2007-03-21 23:47:57.0","null","null","null","null","null"
"xx12","R","2011-08-22 19:50:25.0","2012-06-21 05:52:12.0","null","null","null","null","null"
"xx13","J","2003-07-07 12:00:00.0","null","null","null","2003-07-10 12:00:00.0","null","null"
"xx14","A","2008-09-24 11:36:34.0","null","null","null","null","null","null"

Answer 1

您的问题在于您正在转换为periods。您看到的NaT实际上是一个period对象。在

解决这个问题的一种方法是转换为字符串。在

使用

.dt.strftime('%Y-%m-%d')

而不是

^{pr2}$

然后您看到的NaT将是字符串，可以像这样替换

.dt.strftime('%Y-%m-%d').replace('NaT', '')

---

df = pd.DataFrame(dict(date=pd.to_datetime(['2015-01-01', pd.NaT])))
df

df.date.dt.strftime('%Y-%m-%d')

0    2015-01-01
1           NaT
Name: date, dtype: object

---

df.date.dt.strftime('%Y-%m-%d').replace('NaT', '')

0    2015-01-01
1              
Name: date, dtype: object