Josue
Thanks so much! That makes so much sense.
I really appreciate it.
Sincerely,
Chris
On Wed, Sep 29, 2021 at 5:27 PM Josué Alvarez <josuetec2...@gmail.com>
wrote:
>
> Try with:
>
> *global allowed*
> *allowed* = [e.service.name for e in aservs]
> ...
> servs = [a.service for a in appts if (a.service in *allowed*)]
> El lunes, 20 de septiembre de 2021 a las 8:46:07 UTC-6, cseb...@gmail.com
> escribió:
>
>> I noticed a list comprehension bombs in the "./manage.py shell" shell
>> that I think would
>> be ok in normal Python shell. What is different about "./manage.py shell"
>> that makes it not like certain list comprehensions?
>>
>> Here is the code erase that I run this way..."./manage.py shell < erase"
>>
>> import bighelp.models
>>
>> ACCT = bighelp.models.Account
>> ASERV = bighelp.models.AccountService
>> APPT = bighelp.models.Appointment
>>
>> for e in ACCT.objects.all()[:1]:
>> appts = APPT.objects.filter(account = e)[:3]
>> aservs = ASERV.objects.filter(account = e)
>> allowed = [e.service.name for e in aservs]
>>
>> print(f"allowed is a list of strings => {allowed}\n\n")
>>
>> print(f"appts is a collection of Django objects => {appts}\n\n")
>>
>> print("This way of defining servs works...\n\n")
>>
>> servs = []
>> for a in appts:
>> if a.service in allowed:
>> servs.append(a.service)
>> print(f"servs = {servs}\n\n")
>>
>> print("This way gives a mysterious error...\n\n")
>>
>> servs = [a.service for a in appts if (a.service in allowed)]
>>
>>
>>
>>
>> ***THE OUTPUT****
>>
>>
>> ../manage.py shell < ./erase
>> allowed is a list of strings => ['pet', 'cleaning']
>>
>>
>> appts is a collection of Django objects => <QuerySet [<Appointment:
>> Appointment object (998)>, <Appointment: Appointment object (1463561)>,
>> <Appointment: Appointment object (863)>]>
>>
>>
>> This way of defining servs works...
>>
>>
>> servs = ['cleaning', 'pet', 'cleaning']
>>
>>
>> This way gives a mysterious error...
>>
>>
>> Traceback (most recent call last):
>> File "../manage.py", line 8, in <module>
>> django.core.management.execute_from_command_line(sys.argv)
>> File
>> "/usr/lib/python3/dist-packages/django/core/management/__init__.py", line
>> 381, in execute_from_command_line
>> utility.execute()
>> File
>> "/usr/lib/python3/dist-packages/django/core/management/__init__.py", line
>> 375, in execute
>> self.fetch_command(subcommand).run_from_argv(self.argv)
>> File "/usr/lib/python3/dist-packages/django/core/management/base.py",
>> line 323, in run_from_argv
>> self.execute(*args, **cmd_options)
>> File "/usr/lib/python3/dist-packages/django/core/management/base.py",
>> line 364, in execute
>> output = self.handle(*args, **options)
>> File
>> "/usr/lib/python3/dist-packages/django/core/management/commands/shell.py",
>> line 92, in handle
>> exec(sys.stdin.read())
>> File "<string>", line 26, in <module>
>> File "<string>", line 26, in <listcomp>
>> NameError: name 'allowed' is not defined
>>
>> --
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