语法错误，我尝试将django项目加载到生产服务器上

Question

我试图将我的项目加载到生产服务器上，对于在测试环境中可以正常工作的某些东西，我遇到以下语法错误，这有什么帮助吗？

我看不到为什么出现错误

  

f'accounts / emails / {template} .html'，上下文）^ SyntaxError：语法无效

这是代码

def send_mail(to, template, context):
    html_content = render_to_string(f'accounts/emails/{template}.html', context)
    text_content = render_to_string(f'accounts/emails/{template}.txt', context)

错误回溯

Unhandled exception in thread started by <function check_errors.<locals>.wrapper at 0x7f00e7044158>
    Traceback (most recent call last):
      File "/usr/local/lib/python3.5/dist-packages/django/utils/autoreload.py", line 225, in wrapper
        fn(*args, **kwargs)
      File "/usr/local/lib/python3.5/dist-packages/django/core/management/commands/runserver.py", line 117, in inner_run
        self.check(display_num_errors=True)
      File "/usr/local/lib/python3.5/dist-packages/django/core/management/base.py", line 379, in check
        include_deployment_checks=include_deployment_checks,
      File "/usr/local/lib/python3.5/dist-packages/django/core/management/base.py", line 366, in _run_checks
        return checks.run_checks(**kwargs)
      File "/usr/local/lib/python3.5/dist-packages/django/core/checks/registry.py", line 71, in run_checks
        new_errors = check(app_configs=app_configs)
      File "/usr/local/lib/python3.5/dist-packages/django/core/checks/urls.py", line 13, in check_url_config
        return check_resolver(resolver)
      File "/usr/local/lib/python3.5/dist-packages/django/core/checks/urls.py", line 23, in check_resolver
        return check_method()
      File "/usr/local/lib/python3.5/dist-packages/django/urls/resolvers.py", line 396, in check
        for pattern in self.url_patterns:
      File "/usr/local/lib/python3.5/dist-packages/django/utils/functional.py", line 37, in __get__
        res = instance.__dict__[self.name] = self.func(instance)
      File "/usr/local/lib/python3.5/dist-packages/django/urls/resolvers.py", line 533, in url_patterns
        patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
      File "/usr/local/lib/python3.5/dist-packages/django/utils/functional.py", line 37, in __get__
        res = instance.__dict__[self.name] = self.func(instance)
      File "/usr/local/lib/python3.5/dist-packages/django/urls/resolvers.py", line 526, in urlconf_module
        return import_module(self.urlconf_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 665, in exec_module
      File "<frozen importlib._bootstrap>", line 222, in _call_with_frames_removed
      File "/home/grouped/teroexamplecom/teroexamplecom/urls.py", line 21, in <module>
        url(r'^', include('toys.urls')),
      File "/usr/local/lib/python3.5/dist-packages/django/urls/conf.py", line 34, in include
        urlconf_module = import_module(urlconf_module)
      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 665, in exec_module
      File "<frozen importlib._bootstrap>", line 222, in _call_with_frames_removed
      File "/home/grouped/teroexamplecom/toys/urls.py", line 4, in <module>
        from toys import views as toysviews
      File "/home//grouped/toys/views.py", line 100, in <module>
        from .utils import (
      File "/home//toys/utils.py", line 9
        html_content = render_to_string(f'accounts/emails/{template}.html', context)
                                                                         ^
    SyntaxError: invalid syntax

Answer 1

在{strong> Python 3.6 中引入了f-string符号。在Python3.6以下将不可用。

Soluation-1

将python版本升级到Python3.6或更高版本

解决方案2

使用format()方法

def send_mail(to, template, context):
    html_content = render_to_string('accounts/emails/{template}.html'.format(template=template), context)
    text_content = render_to_string('accounts/emails/{template}.txt'.format(template=template), context)