In [2]: to_datetime('20 Monday', format='%V %A')
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
Cell In[2], line 1
----> 1 to_datetime('20 Monday', format='%V %A')
File ~/pandas-dev/pandas/core/tools/datetimes.py:1100, in to_datetime(arg, errors, dayfirst, yearfirst, utc, format, exact, unit, infer_datetime_format, origin, cache)
1098 result = convert_listlike(argc, format)
1099 else:
-> 1100 result = convert_listlike(np.array([arg]), format)[0]
1101 if isinstance(arg, bool) and isinstance(result, np.bool_):
1102 result = bool(result) # TODO: avoid this kludge.
File ~/pandas-dev/pandas/core/tools/datetimes.py:442, in _convert_listlike_datetimes(arg, format, name, utc, unit, errors, dayfirst, yearfirst, exact)
439 require_iso8601 = format is not None and format_is_iso(format)
441 if format is not None and not require_iso8601:
--> 442 return _to_datetime_with_format(
443 arg,
444 orig_arg,
445 name,
446 utc,
447 format,
448 exact,
449 errors,
450 )
452 result, tz_parsed = objects_to_datetime64ns(
453 arg,
454 dayfirst=dayfirst,
(...)
461 exact=exact,
462 )
464 if tz_parsed is not None:
465 # We can take a shortcut since the datetime64 numpy array
466 # is in UTC
File ~/pandas-dev/pandas/core/tools/datetimes.py:543, in _to_datetime_with_format(arg, orig_arg, name, utc, fmt, exact, errors)
540 return _box_as_indexlike(result, utc=utc, name=name)
542 # fallback
--> 543 res = _array_strptime_with_fallback(arg, name, utc, fmt, exact, errors)
544 return res
File ~/pandas-dev/pandas/core/tools/datetimes.py:485, in _array_strptime_with_fallback(arg, name, utc, fmt, exact, errors)
481 """
482 Call array_strptime, with fallback behavior depending on 'errors'.
483 """
484 try:
--> 485 result, timezones = array_strptime(
486 arg, fmt, exact=exact, errors=errors, utc=utc
487 )
488 except OutOfBoundsDatetime:
489 if errors == "raise":
File ~/pandas-dev/pandas/_libs/tslibs/strptime.pyx:347, in pandas._libs.tslibs.strptime.array_strptime()
345 week_of_year = int(found_dict[group_key])
346 if group_key == "U":
--> 347 # U starts week on Sunday.
348 week_of_year_start = 6
349 else:
ValueError: ISO week directive '%V' is incompatible with the year directive '%Y'. Use the ISO year '%G' instead.
ValueError: ISO year directive '%V' must be used with the ISO week directive '%G' and a weekday directive '%A', '%a', '%w', or '%u'.
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