type object 'datetime.datetime' has no attribute 'fromisoformat'
Question:
I have a script with the following import:
from datetime import datetime
and a piece of code where I call:
datetime.fromisoformat(duedate)
Sadly, when I run the script with an instance of Python 3.6, the console returns the following error:
AttributeError: type object ‘datetime.datetime’ has no attribute ‘fromisoformat’
I tried to run it from two instances of anaconda (3.7 and 3.8) and it works nice and smooth.
I supposed there was an import problem so I tried to copy datetime.py from anaconda/Lib to the script directory, with no success.
The datetime.py clearly contains the class datetime and the method fromisoformat but still it seems unlinked. I even tried to explicitly link the datetime.py file, with the same error:
parent_dir = os.path.abspath(os.path.dirname(__file__))
vendor_dir = os.path.join(parent_dir, 'libs')
sys.path.append(vendor_dir+os.path.sep+"datetime.py")
Can you help me? My ideas are over…
Answers:
you should not use from datetime import datetime but import datetime, you just confusing naming of the module.
now you can use datetime.fromisoformat(duedate).
The issue here is actually that fromisoformat is not available in Python versions older than 3.7, you can see that clearly stated in the documenation here.
Return a date corresponding to a date_string given in the format YYYY-MM-DD:
>>>
>>> from datetime import date
>>> date.fromisoformat('2019-12-04')
datetime.date(2019, 12, 4)
This is the inverse of date.isoformat(). It only supports the format YYYY-MM-DD.
New in version 3.7.
I had the same issue and found this:
https://pypi.org/project/backports-datetime-fromisoformat/
>>> from datetime import date, datetime, time
>>> from backports.datetime_fromisoformat import MonkeyPatch
>>> MonkeyPatch.patch_fromisoformat()
>>> datetime.fromisoformat("2014-01-09T21:48:00-05:30")
datetime.datetime(2014, 1, 9, 21, 48, tzinfo=-05:30)
>>> date.fromisoformat("2014-01-09")
datetime.date(2014, 1, 9)
>>> time.fromisoformat("21:48:00-05:30")
datetime.time(21, 48, tzinfo=-05:30)
Works like a charm.
You should refactor datetime.fromisoformat('2021-08-12') to use datetime.strptime like this:
In [1]: from datetime import datetime
In [2]: datetime.strptime("2021-08-08", "%Y-%m-%d")
Out[2]: datetime.datetime(2021, 8, 8, 0, 0)
Python version 3.6 and older don’t have the fromisoformat() methods – as mentioned in other documentation – both datetime.fromisoformat (docs) and date.fromisoformat (docs) are not available.
You can use this code I wrote to implement this in Python 3.6. I prefer not to install additional dependencies for functions I hardly use – in my case, I only use it in a test.
Python3.6 and below
from datetime import datetime
time_expected = datetime.now()
time_actual = datetime.strptime(time_actual.isoformat(), "%Y-%m-%dT%H:%M:%S.%f")
assert time_actual == time_expected
Python3.7+
from datetime import datetime
time_expected = datetime.now()
time_actual = datetime.fromisoformat(time_expected.isoformat())
assert time_actual == time_expected
I have a script with the following import:
from datetime import datetime
and a piece of code where I call:
datetime.fromisoformat(duedate)
Sadly, when I run the script with an instance of Python 3.6, the console returns the following error:
AttributeError: type object ‘datetime.datetime’ has no attribute ‘fromisoformat’
I tried to run it from two instances of anaconda (3.7 and 3.8) and it works nice and smooth.
I supposed there was an import problem so I tried to copy datetime.py from anaconda/Lib to the script directory, with no success.
The datetime.py clearly contains the class datetime and the method fromisoformat but still it seems unlinked. I even tried to explicitly link the datetime.py file, with the same error:
parent_dir = os.path.abspath(os.path.dirname(__file__))
vendor_dir = os.path.join(parent_dir, 'libs')
sys.path.append(vendor_dir+os.path.sep+"datetime.py")
Can you help me? My ideas are over…
you should not use from datetime import datetime but import datetime, you just confusing naming of the module.
now you can use datetime.fromisoformat(duedate).
The issue here is actually that fromisoformat is not available in Python versions older than 3.7, you can see that clearly stated in the documenation here.
Return a date corresponding to a date_string given in the format YYYY-MM-DD:
>>>
>>> from datetime import date
>>> date.fromisoformat('2019-12-04')
datetime.date(2019, 12, 4)
This is the inverse of date.isoformat(). It only supports the format YYYY-MM-DD.
New in version 3.7.
I had the same issue and found this:
https://pypi.org/project/backports-datetime-fromisoformat/
>>> from datetime import date, datetime, time
>>> from backports.datetime_fromisoformat import MonkeyPatch
>>> MonkeyPatch.patch_fromisoformat()
>>> datetime.fromisoformat("2014-01-09T21:48:00-05:30")
datetime.datetime(2014, 1, 9, 21, 48, tzinfo=-05:30)
>>> date.fromisoformat("2014-01-09")
datetime.date(2014, 1, 9)
>>> time.fromisoformat("21:48:00-05:30")
datetime.time(21, 48, tzinfo=-05:30)
Works like a charm.
You should refactor datetime.fromisoformat('2021-08-12') to use datetime.strptime like this:
In [1]: from datetime import datetime
In [2]: datetime.strptime("2021-08-08", "%Y-%m-%d")
Out[2]: datetime.datetime(2021, 8, 8, 0, 0)
Python version 3.6 and older don’t have the fromisoformat() methods – as mentioned in other documentation – both datetime.fromisoformat (docs) and date.fromisoformat (docs) are not available.
You can use this code I wrote to implement this in Python 3.6. I prefer not to install additional dependencies for functions I hardly use – in my case, I only use it in a test.
Python3.6 and below
from datetime import datetime
time_expected = datetime.now()
time_actual = datetime.strptime(time_actual.isoformat(), "%Y-%m-%dT%H:%M:%S.%f")
assert time_actual == time_expected
Python3.7+
from datetime import datetime
time_expected = datetime.now()
time_actual = datetime.fromisoformat(time_expected.isoformat())
assert time_actual == time_expected