安装flask-humanify后触发SyntaxError语法错误求助

嘿，这个问题我一眼就看穿啦！先给你拆解下问题根源：

你报错信息里的这行代码：

if not (value := request.environ.get(header)):

这里用到了海象运算符:=，这个语法是Python 3.8才正式引入的新特性，但你当前用的是Python 3.6，这个版本完全不认识这种写法，所以直接抛出了语法错误。

再看你的安装日志，你装的是flask-humanify 0.2.3版本，这个版本的代码已经用上了Python3.8+的特性，和你的Python3.6环境完全不兼容。

给你两个可行的解决方案：

• 方案一（强烈推荐）：升级Python版本
  Python3.6早就停止官方维护了，不仅有安全隐患，后续还会遇到大量新库不兼容的问题。建议你把Python升级到3.8或更高版本，之后重新安装flask-humanify就能正常使用了。
• 方案二：安装兼容Python3.6的旧版本
  如果暂时没法升级Python，可以试试安装flask-humanify的旧版本，找一个还没使用海象运算符的版本。比如你可以执行这条命令试试：

  pip install flask-humanify==0.2.0
  

  如果这个版本还是不行，可以去项目的版本发布记录里找明确标注支持Python3.6的版本。

附上你提供的错误详情和安装日志：

错误回溯信息 #

Traceback (most recent call last):
  File "once.py", line 29, in <module>
    from flask_humanify import Humanify
  File "/usr/local/lib/python3.6/site-packages/flask_humanify/__init__.py", line 9, in <module>
    from . import utils
  File "/usr/local/lib/python3.6/site-packages/flask_humanify/utils.py", line 58
    if not (value := request.environ.get(header)):
                                               ^
SyntaxError: invalid syntax

安装命令及输出 #

pip install flask-humanify --upgrade
Collecting flask-humanify
Using cached flask_humanify-0.2.3-py3-none-any.whl (82.4 MB)
Requirement already satisfied: pydub in /usr/local/lib/python3.6/site-packages (from flask-humanify) (0.25.1)
Requirement already satisfied: netaddr in /usr/local/lib/python3.6/site-packages (from flask-humanify) (0.10.1)
Requirement already satisfied: Flask in /usr/local/lib/python3.6/site-packages (from flask-humanify) (1.1.1)
Requirement already satisfied: cryptography in /usr/local/lib/python3.6/site-packages (from flask-humanify) (40.0.2)
Requirement already satisfied: opencv-python-headless in /usr/local/lib/python3.6/site-packages (from flask-humanify) (4.5.5.64)
Requirement already satisfied: numpy in /usr/local/lib/python3.6/site-packages (from flask-humanify) (1.17.4)
Requirement already satisfied: scipy in /usr/local/lib/python3.6/site-packages (from flask-humanify) (1.3.3)
Requirement already satisfied: cffi>=1.12 in /usr/local/lib/python3.6/site-packages (from cryptography->flask-humanify) (1.15.1)
Requirement already satisfied: click>=5.1 in /usr/local/lib/python3.6/site-packages (from Flask->flask-humanify) (7.0)
Requirement already satisfied: itsdangerous>=0.24 in /usr/local/lib/python3.6/site-packages (from Flask->flask-humanify) (1.1.0)
Requirement already satisfied: Jinja2>=2.10.1 in /usr/local/lib/python3.6/site-packages (from Flask->flask-humanify) (2.10.3)
Requirement already satisfied: Werkzeug>=0.15 in /usr/local/lib/python3.6/site-packages (from Flask->flask-humanify) (0.16.0)
Requirement already satisfied: importlib-resources in /usr/local/lib/python3.6/site-packages (from netaddr->flask-humanify) (5.4.0)
Requirement already satisfied: pycparser in /usr/local/lib/python3.6/site-packages (from cffi>=1.12->cryptography->flask-humanify) (2.21)
Requirement already satisfied: MarkupSafe>=0.23 in /usr/local/lib/python3.6/site-packages (from Jinja2>=2.10.1->Flask->flask-humanify) (1.1.1)
Requirement already satisfied: zipp>=3.1.0 in /usr/local/lib/python3.6/site-packages (from importlib-resources->netaddr->flask-humanify) (3.6.0)
Installing collected packages: flask-humanify
Successfully installed flask-humanify-0.2.3
WARNING: Running pip as the 'root' user can result in broken permissions and conflicting behaviour with the system package manager. It is recommended to use a virtual environment instead: https://pip.pypa.io/warnings/venv

内容来源于stack exchange