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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