TypeError: can't compare datetime.datetime to NoneType

[adtrombley]

I ran your example, and I got the following error -->

schedule.run_pending()
Traceback (most recent call last):
File "", line 1, in
File "//anaconda/lib/python2.7/site-packages/schedule/init.py", line 462, in run_pending
default_scheduler.run_pending()
File "//anaconda/lib/python2.7/site-packages/schedule/init.py", line 74, in run_pending
for job in sorted(runnable_jobs):
File "//anaconda/lib/python2.7/site-packages/schedule/init.py", line 73, in
runnable_jobs = (job for job in self.jobs if job.should_run)
File "//anaconda/lib/python2.7/site-packages/schedule/init.py", line 368, in should_run
return datetime.datetime.now() >= self.next_run
TypeError: can't compare datetime.datetime to NoneType

[dbader]

@adtrombley Can you give some more info on what lines of code came before the run_pending() call? Thanks!

[adtrombley]

I'm using python 2.7, this must be the problem.

…

On Fri, Jan 13, 2017 at 5:40 AM, Daniel Bader ***@***.***> wrote: @adtrombley <https://github.com/adtrombley> Can you give some more info on what lines of code came before the run_pending() call? Thanks! — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#125 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ACU-QM2DLBwUrAUQQ1OdRbEvfiTSFGSOks5rR37KgaJpZM4LiPhP> .

-- regards, Austin D. Trombley, MBA CTO - Random Forest Capital, LLC cell: 415-767-6179

[dbader]

@adtrombley Mmh... This should work fine on 2.7 and 3.X. I'll need some more context to be able to help you out though :)

[KennyRIM]

I've also encountered this error.
Looks like, an interrupted job definition chain breaks the module in current session, e.g.:

import schedule
def job():
    print("I'm working...")

schedule.every(10).seconds   #AttributeError: 'NoneType' object has no attribute 'args'

schedule.every(10).seconds.do(job)
schedule.run_pending()  #TypeError: can't compare datetime.datetime to NoneType
# and at this point it's broken until the shell is restarted

The issue would mainly hit those who just wants to play with the module in a python shell.

[jgerardsimcock]

I'm also getting this error using an ipython notebook. I am following the example. It does work, however, if you restart the kernel/shell

[dbader]

Thanks @KennyRIM, will look into this. I'm not sure when I'll be able to get to it, so if anyone want's to get started with a PR fix I'd appreciate it.

[matuusu]

The issue would mainly hit those who just wants to play with the module in a python shell.

IPython runs repr() on job object created in Scheduler.every(), which accesses self.job_func.args (where self.job_func is None at this time) BEFORE it is set in Job.do().

repr() on Job can be called only AFTER Job.do() initializes the Job instance.

the only way I was able to reproduce op's traceback is by incorrect use of schedule.every()

import schedule

schedule.every()
schedule.every(10).seconds.do(lambda:print('lambda'))   # not needed here
schedule.run_pending()

traceback:

Traceback (most recent call last):
  File "R:\test.py", line 5, in <module>
    schedule.run_pending()
  File "c:\Users\matus\Documents\_bin\Miniconda3\lib\site-packages\schedule\__init__.py", line 462, in run_pending
    default_scheduler.run_pending()
  File "c:\Users\matus\Documents\_bin\Miniconda3\lib\site-packages\schedule\__init__.py", line 74, in run_pending
    for job in sorted(runnable_jobs):
  File "c:\Users\matus\Documents\_bin\Miniconda3\lib\site-packages\schedule\__init__.py", line 73, in <genexpr>
    runnable_jobs = (job for job in self.jobs if job.should_run)
  File "c:\Users\matus\Documents\_bin\Miniconda3\lib\site-packages\schedule\__init__.py", line 368, in should_run
    return datetime.datetime.now() >= self.next_run
TypeError: '>=' not supported between instances of 'datetime.datetime' and 'NoneType'

quick fix would be to check for job initialization before run:

class CancelJob(object):
...
    def run_pending(self):
        ## add this line
        [self.jobs.pop(index) for index, job in enumerate(self.jobs) if job.job_func is None]
        runnable_jobs = (job for job in self.jobs if job.should_run)
        for job in sorted(runnable_jobs):
            self._run_job(job)
...

and maybe do the same in run_all()

fix proposal:
matuusu@4b1b15f

[AstraLuma]

I think I'm getting something similar:

Traceback (most recent call last):
  File "/home/jbliss/miniconda3/envs/xonsh/lib/python3.6/threading.py", line 916, in _bootstrap_inner
    self.run()
  File "/home/jbliss/.xonshrc", line 32, in run
    time.sleep(min(schedule.idle_seconds(), nextsched))
  File "/home/jbliss/miniconda3/envs/xonsh/lib/python3.6/site-packages/schedule/__init__.py", line 487, in idle_seconds
    return default_scheduler.idle_seconds
  File "/home/jbliss/miniconda3/envs/xonsh/lib/python3.6/site-packages/schedule/__init__.py", line 150, in idle_seconds
    return (self.next_run - datetime.datetime.now()).total_seconds()
TypeError: unsupported operand type(s) for -: 'NoneType' and 'datetime.datetime'

I assume it's from trying to run the scheduler without having any jobs configured.

[dbader]

Will be fixed in the next release now that #143 is merged.

[bardiazamanian]

Hi @dbader
Could you tag your update?

[SijmenHuizenga]

Has been released as part of 0.5.0 on nov 16, 2017

[Ben-CN]

Hi @dbader ,

I had the below error for Schedule 1.1.0 which seems to be the same bug but not sure.

Fatal Python error: none_dealloc: deallocating None: bug likely caused by a refcount error in a C extension
Python runtime state: initialized
Current thread 0x00007f019244c740 (most recent call first):
File "/usr/local/lib/python3.11/site-packages/schedule/init.py", line 661 in run
File "/usr/local/lib/python3.11/site-packages/schedule/init.py", line 172 in _run_job
File "/usr/local/lib/python3.11/site-packages/schedule/init.py", line 100 in run_pending
File "/usr/local/lib/python3.11/site-packages/schedule/init.py", line 780 in run_pending
File "/usr/app/src/./app.py", line 363 in
Extension modules: charset_normalizer.md, _mysql_connector, yaml._yaml (total: 3)

I can't share the full code but its essentially scheduling two different function which each run some API's calls (REST/SOAP) and store the results to MySQL. One runs every minute and one runs every day.

Looking a the logs, the scheduler for the every minute tasks kept running about 30 times before it stopped suddenly. The fatal error is the only clue I was able to find.

schedule.every(1).minutes.do(function1)
schedule.every().day.at("03:30").do(function2)

schedule.run_all()

while True:
    schedule.run_pending()
    time.sleep(1)

I am updating to schedule 1.2 and hopefully it resolved the issue.