TypeError: Unrecognized value type: ＜class ‘str‘＞ ParserError: Unknown string format

Posted 2022-08-03 Data+Science+Insight

TypeError: Unrecognized value type: <class 'str'>  ParserError: Unknown string format

目录

TypeError: Unrecognized value type:   ParserError: Unknown string format

问题：

解决：

完整错误：

---

问题：

import pandas as pd

# Define Panda Series
times = pd.Series(["2021-01-25", "2021/01/08", "2021", "Hello World", "Jan 4th, 2022"])

# Print Series
print("Series: \\n", times, "\\n")

# Convert Series to datetime
print("datetime: \\n", pd.to_datetime(times))

解决：

import pandas as pd

# Define Panda Series
times = pd.Series(["2021-01-25", "2021/01/08", "2021", "Hello World", "Jan 4th, 2022"])

# Print Series
print("Series: \\n", times, "\\n")

# Convert Series to datetime
print("datetime: \\n", pd.to_datetime(times, errors = 'coerce'))

Series: 
 0       2021-01-25
1       2021/01/08
2             2021
3      Hello World
4    Jan 4th, 2022
dtype: object 

datetime: 
 0   2021-01-25
1   2021-01-08
2   2021-01-01
3          NaT
4   2022-01-04
dtype: datetime64[ns]

完整错误：

Series: 
 0       2021-01-25
1       2021/01/08
2             2021
3      Hello World
4    Jan 4th, 2022
dtype: object 

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
D:\\anaconda\\lib\\site-packages\\pandas\\core\\arrays\\datetimes.py in objects_to_datetime64ns(data, dayfirst, yearfirst, utc, errors, require_iso8601, allow_object)
   2084         try:
-> 2085             values, tz_parsed = conversion.datetime_to_datetime64(data)
   2086             # If tzaware, these values represent unix timestamps, so we

pandas\\_libs\\tslibs\\conversion.pyx in pandas._libs.tslibs.conversion.datetime_to_datetime64()

TypeError: Unrecognized value type: <class 'str'>

During handling of the above exception, another exception occurred:

ParserError                               Traceback (most recent call last)
<ipython-input-1-a11a96b9d90d> in <module>
      8 
      9 # Convert Series to datetime
---> 10 print("datetime: \\n", pd.to_datetime(times))

D:\\anaconda\\lib\\site-packages\\pandas\\core\\tools\\datetimes.py in to_datetime(arg, errors, dayfirst, yearfirst, utc, format, exact, unit, infer_datetime_format, origin, cache)
    803             result = arg.map(cache_array)
    804         else:
--> 805             values = convert_listlike(arg._values, format)
    806             result = arg._constructor(values, index=arg.index, name=arg.name)
    807     elif isinstance(arg, (ABCDataFrame, abc.MutableMapping)):

D:\\anaconda\\lib\\site-packages\\pandas\\core\\tools\\datetimes.py in _convert_listlike_datetimes(arg, format, name, tz, unit, errors, infer_datetime_format, dayfirst, yearfirst, exact)
    470             errors=errors,
    471             require_iso8601=require_iso8601,
--> 472             allow_object=True,
    473         )
    474 

D:\\anaconda\\lib\\site-packages\\pandas\\core\\arrays\\datetimes.py in objects_to_datetime64ns(data, dayfirst, yearfirst, utc, errors, require_iso8601, allow_object)
   2088             return values.view("i8"), tz_parsed
   2089         except (ValueError, TypeError):
-> 2090             raise e
   2091 
   2092     if tz_parsed is not None:

D:\\anaconda\\lib\\site-packages\\pandas\\core\\arrays\\datetimes.py in objects_to_datetime64ns(data, dayfirst, yearfirst, utc, errors, require_iso8601, allow_object)
   2079             dayfirst=dayfirst,
   2080             yearfirst=yearfirst,
-> 2081             require_iso8601=require_iso8601,
   2082         )
   2083     except ValueError as e:

pandas\\_libs\\tslib.pyx in pandas._libs.tslib.array_to_datetime()

pandas\\_libs\\tslib.pyx in pandas._libs.tslib.array_to_datetime()

pandas\\_libs\\tslib.pyx in pandas._libs.tslib.array_to_datetime_object()

pandas\\_libs\\tslib.pyx in pandas._libs.tslib.array_to_datetime_object()

pandas\\_libs\\tslibs\\parsing.pyx in pandas._libs.tslibs.parsing.parse_datetime_string()

D:\\anaconda\\lib\\site-packages\\dateutil\\parser\\_parser.py in parse(timestr, parserinfo, **kwargs)
   1372         return parser(parserinfo).parse(timestr, **kwargs)
   1373     else:
-> 1374         return DEFAULTPARSER.parse(timestr, **kwargs)
   1375 
   1376 

D:\\anaconda\\lib\\site-packages\\dateutil\\parser\\_parser.py in parse(self, timestr, default, ignoretz, tzinfos, **kwargs)
    647 
    648         if res is None:
--> 649             raise ParserError("Unknown string format: %s", timestr)
    650 
    651         if len(res) == 0:

ParserError: Unknown string format: Hello World