Question

我已经按照步骤从下面的链接安装Airflow

  Traceback (most recent call last):
  File "/usr/local/bin/airflow", line 25, in <module>
  from airflow.configuration import conf
  File "/usr/local/lib/python3.5/dist-packages/airflow/__init__.py", line 42, in <module>
  from airflow.models import DAG
  File "/usr/local/lib/python3.5/dist-packages/airflow/models/__init__.py", line 21, in 
  <module>
  from airflow.models.baseoperator import BaseOperator, BaseOperatorLink  # noqa: F401
  File "/usr/local/lib/python3.5/dist-packages/airflow/models/baseoperator.py", line 30, in 
  <module>
  from typing import Any, Callable, ClassVar, Dict, FrozenSet, Iterable, List, Optional, 
  Set, Type, Union
  ImportError: cannot import name 'ClassVar'

有人可以在这里帮我吗

Answer 1

我也遇到相同的错误：

Ubuntu 16.04
Python 3.5
气流1.10.10

经过一番检查，我发现这是一个python版本的问题，即python3.5不支持模块键入。ClassVar：https://docs.python.org/3.5/library/typing.html

As introduced in PEP 526, a variable annotation wrapped in ClassVar indicates that a given attribute is intended to be used as a class variable and should not be set on instances of that class.

并检查了PEP 526，发现该功能仅从3.6开始支持，哦。

因此，解决方案是将Python版本升级到3.6+，以安装Airflow 1.10。

sudo add-apt-repository ppa:deadsnakes/ppa
sudo apt-get update
sudo apt-get install python3.7
sudo apt install build-essential libssl-dev libffi-dev python3.7-dev
sudo apt-get install python3.7-venv

以上所有步骤均成功执行。为了完善官方指南，安装环境要求如下：

Ubuntu 16.04
Python 3.6 +
气流1.10.10

ImportError：安装气流后无法导入名称“ ClassVar”

1 个答案: