请参见以下示例:
import datetime
#this works
datetime.datetime(1973,1,23,0).timestamp()
#this produces OSError: [Errno 22] Invalid argument
datetime.datetime(1953,1,23,0).timestamp()
当我将datetime64[ns]日期早于历元的Pandas数据帧转换为ApacheSpark数据帧时,会收到一系列关于Exception ignored in: 'pandas._libs.tslibs.tzconversion._tz_convert_tzlocal_utc'
(下面是完整堆栈跟踪)的警告,并且历元前的日期会更改为历元。为什么会发生这种情况?我该如何预防
视窗10 Python:3.7.6 pyspark 2.4.5 熊猫1.0.1
#imports
import pandas as pd
from datetime import datetime
from pyspark.sql import SparkSession
#set up spark
spark = SparkSession.builder.getOrCreate()
#create dataframe
df = pd.DataFrame({'Dates': [datetime(2019,3,29), datetime(1953,2,20)]})
#data types
df.dtypes
"""
Result:
Dates datetime64[ns]
dtype: object
"""
#try to convert to spark
sparkdf = spark.createDataFrame(df)
Exception ignored in: 'pandas._libs.tslibs.tzconversion._tz_convert_tzlocal_utc'
Traceback (most recent call last):
File "C:\Users\jbishop\AppData\Roaming\Python\Python37\site-packages\dateutil\tz\_common.py", line 144, in fromutc
return f(self, dt)
File "C:\Users\jbishop\AppData\Roaming\Python\Python37\site-packages\dateutil\tz\_common.py", line 258, in fromutc
dt_wall = self._fromutc(dt)
File "C:\Users\jbishop\AppData\Roaming\Python\Python37\site-packages\dateutil\tz\_common.py", line 222, in _fromutc
dtoff = dt.utcoffset()
File "C:\Users\jbishop\AppData\Roaming\Python\Python37\site-packages\dateutil\tz\tz.py", line 222, in utcoffset
if self._isdst(dt):
File "C:\Users\jbishop\AppData\Roaming\Python\Python37\site-packages\dateutil\tz\tz.py", line 291, in _isdst
dstval = self._naive_is_dst(dt)
File "C:\Users\jbishop\AppData\Roaming\Python\Python37\site-packages\dateutil\tz\tz.py", line 260, in _naive_is_dst
return time.localtime(timestamp + time.timezone).tm_isdst
OSError: [Errno 22] Invalid argument
sparkdf.show()
+-------------------+
| Dates|
+-------------------+
|2019-03-29 00:00:00|
|1970-01-01 00:00:00|
+-------------------+
sparkdf.printSchema()
root
|-- Dates: timestamp (nullable = true)
这不是一个答案,但可能有助于了解情况。即使是接近1970 01 00:00的日期,也给我22号错误。 (我希望解决一些非常早期的历元时间,因为在NTP时间可用之前记录数据。) 最早的工作日期是在1970年01月17日左右
我的电脑在时区MDT或GMT-6(MST和夏令时)
Python新手和第一次回答作者! 视窗10。Python 3.7(64位)。附近有一条Python,但这里没有使用
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