fabric Import Error: cannot import name 'isMappingType'

Question

我在为 Django 项目部署 fabfile 的过程中遇到了这个 "ImportError: cannot import name 'isMappingType' "。

1.Here是我的fabfile.py

的结构

from __future__ import with_statement
from fabric.api import *
from fabric.contrib.console import confirm
from fabric.contrib.files import append, exists, sed

env.hosts = ["127.0.0.1"]

env.user = raw_input('Please enter user:')

def deploy():
      sudo("apt-get update -y")
sudo("apt-get install git -y")
sudo("apt-get install postgresql libpq-dev python-dev python-pip -y")

code_dir = 'backend-directory'

if exists(code_dir):
   run('cd %s && git pull' % (code_dir,)) 
else:
   run("git clone git://serveraddress/projects/backend-directory")


with cd(code_dir):
  sudo("pip install virtualenv")
  run("virtualenv -p /usr/bin/python3.4 venv")
  run("source venv/bin/activate")
  #sudo("pip install -r requirements/dev.txt")
  sudo("pip install -r requirements/production.txt")

  with settings(warn_only=True):
    with settings(sudo_user = 'postgres'):
        sudo("psql -c " + '"CREATE USER new_user WITH PASSWORD ' + "'new_password';" + '"')
        sudo("psql -c 'ALTER USER new_user CREATEDB;'")
        sudo("psql -c 'CREATE DATABASE newdb;'")
        sudo("psql -c 'GRANT ALL PRIVILEGES ON DATABASE 'newdb' to new_user;'")

    if run("nginx -v").failed:
        sudo(" apt-get install nginx -y")

code_dir = 'frontend-directory' 

if exists(code_dir):
   run('cd %s && git pull' % (code_dir,)) 
else:
   run("git clone git://serveraddress/frontend-directory")


code_dir = 'backend-directory/project_site'

with cd(code_dir):

    run("python manage.py makemigrations --settings=project.settings.development")
    run("python manage.py migrate --settings=project.settings.development")
    sudo("/etc/init.d/nginx start")

    with settings(warn_only=True):
      if run("find /etc/uwsgi").failed:
          sudo("mkdir /etc/uwsgi")
      if run("find /etc/uwsgi/vassals").failed:
          sudo("mkdir /etc/uwsgi/vassals")
      if run("find /etc/uwsgi/vassals/pam_uwsgi.ini").failed:
          sudo("ln -s ~/backend-direcoty/project_site/pam_uwsgi.ini /etc/uwsgi/vassals/") 

    run("uwsgi --emperor /etc/uwsgi/vassals --uid www-data --gid www-data")

接下来，我在虚拟环境中执行了以下命令

(venv)praneeth@praneeth-Latitude-E6400 ~/wru-pam $ fab deploy

我得到了以下回溯：-

Traceback (most recent call last):
  File "/home/praneeth/wru-pam/venv/bin/fab", line 9, in <module>
    load_entry_point('Fabric==1.10.1', 'console_scripts', 'fab')()
  File "/home/praneeth/wru-pam/venv/lib/python3.4/site-packages/pkg_resources/__init__.py", line 474, in load_entry_point
    return get_distribution(dist).load_entry_point(group, name)
  File "/home/praneeth/wru-pam/venv/lib/python3.4/site-packages/pkg_resources/__init__.py", line 2582, in load_entry_point
    return ep.load()
  File "/home/praneeth/wru-pam/venv/lib/python3.4/site-packages/pkg_resources/__init__.py", line 2265, in load
    return self._load()
  File "/home/praneeth/wru-pam/venv/lib/python3.4/site-packages/pkg_resources/__init__.py", line 2268, in _load
    module = __import__(self.module_name, fromlist=['__name__'], level=0)
  File "/home/praneeth/wru-pam/venv/lib/python3.4/site-packages/fabric/main.py", line 12, in <module>
    from operator import isMappingType
ImportError: cannot import name 'isMappingType'

此导入错误的可能原因是什么？

Answer 1

fabric doesn't support Python 3:

Fabric is a Python (2.5-2.7) library and command-line tool for streamlining the use of SSH for application deployment or systems administration tasks.

另请参阅其他要点和解决方法：

Python 3 support for fabric
python3 compatibility?

据我了解，首先要考虑迁移到 invoke。

演示问题的快速测试：

$ python2.7
>>> from operator import isMappingType
>>>

$ python3.4
>>> from operator import isMappingType
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: cannot import name 'isMappingType'

Answer 2

直到 Python fabric 3 实现发布，您还可以使用任何可用的分支。

其中一个在fabric3 pip包中可用，兼容Python 3:

使用 pip install fabric3 或 pip3 install fabric3

安装

Fabric3 on GitHub

Fabric3 in Python Package Index

以下问题的其中一个答案中也提到了这一点：Python 3 support for fabric

我个人在使用 fabric 构建或服务网站的 Pelican 博客中使用它。它目前完美运行。

Answer 3

python2 : pip 安装结构 python3 : pip 安装 fabric3

Answer 4

这就是我修复它的方式，删除 python3

sudo apt-get remove 'python3.*'

安装结构使用：

pip install fabric
sudo apt-get install fabric

我在运行 fab polish 之后遇到这个错误：

zsh: /usr/local/bin/fab: 错误的解释器: /usr/bin/python3: 没有那个文件或目录

以sudo打开vim中的/usr/local/bin/fab，并更改第一行即 #!/usr/bin/python3 到 #!/usr/bin/python2.7

保存并运行完美润色。现在一切都好！

fabric Import Error: cannot import name 'isMappingType'

fabric Import Error: cannot import name 'isMappingType'

python

django

fabric