Я тестирую очень простой класс в Django db:
class Airport(models.Model):
code = models.CharField(max_length=3)
city = models.CharField(max_length=64)
def __str__(self):
return f"{self.city} ({self.code})"
Однако при makemigrations он возвращает синтаксическую ошибку при использовании return f "{self.city} ({self. code}) ":
Traceback (most recent call last):
File "manage.py", line 15, in <module>
execute_from_command_line(sys.argv)
File "/home/jello/.local/lib/python3.5/site-packages/django/core/management/__init__.py", line 371, in execute_from_command_line
utility.execute()
File "/home/jello/.local/lib/python3.5/site-packages/django/core/management/__init__.py", line 347, in execute
django.setup()
File "/home/jello/.local/lib/python3.5/site-packages/django/__init__.py", line 24, in setup
apps.populate(settings.INSTALLED_APPS)
File "/home/jello/.local/lib/python3.5/site-packages/django/apps/registry.py", line 112, in populate
app_config.import_models()
File "/home/jello/.local/lib/python3.5/site-packages/django/apps/config.py", line 198, in import_models
self.models_module = import_module(models_module_name)
File "/usr/lib/python3.5/importlib/__init__.py", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 986, in _gcd_import
File "<frozen importlib._bootstrap>", line 969, in _find_and_load
File "<frozen importlib._bootstrap>", line 958, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 673, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 661, in exec_module
File "<frozen importlib._bootstrap_external>", line 767, in get_code
File "<frozen importlib._bootstrap_external>", line 727, in source_to_code
File "<frozen importlib._bootstrap>", line 222, in _call_with_frames_removed
File "/mnt/c/Users/green/desktop/project3/orders/models.py", line 11
return f"{self.city} ({self.code})"
^
SyntaxError: invalid syntax
Когда я изменяю строку с помощью:
return '{} ({})'. format (self.city, self.code)
или
return self.city + "(" + self.code + ")"
Оба работают хорошо. Кто-нибудь знает, почему return f "{self.city} ({self.code})" выдает ошибку?
Я использую Python версии 3.5.2 и Django версии 2.0.3
Спасибо!