pip3安装失败

Question

我试图在CentOS 7上安装Ansible，并将Ansible配置为使用Python3。我已经安装了Python2和Python3。

[root@ansible1 ~]# python --version
Python 2.7.5
[root@ansible1 ~]# python3 --version
Python 3.6.8

如果我使用yum install ansible安装Ansible，则ansible --version命令将显示Ansible配置为使用Python2.7.5。我卸载ansible (yum remove ansible)；

[root@ansible1 ~]# ansible --version
ansible 2.9.10
  config file = /etc/ansible/ansible.cfg
  configured module search path = [u'/root/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python2.7/site-packages/ansible
  executable location = /bin/ansible
  python version = 2.7.5 (default, Aug  7 2019, 00:51:29) [GCC 4.8.5 20150623 (Red Hat 4.8.5-39)]

根据https://docs.ansible.com/ansible/latest/reference_附录/蟒蛇_3._support.html的说法：

在Python3下运行/usr/bin/ansible最简单的方法是使用Python3版本的pip安装它。这将使默认的/usr/bin/ansible与Python3一起运行。

我安装了9.0.3版本的pip。

[root@ansible1 ~]# pip3 --version
pip 9.0.3 from /usr/lib/python3.6/site-packages (python 3.6)

在Ansible文档之后，我发布pip3 install ansible来使用pip3安装Ansible。

[root@ansible1 ~]# pip3 install ansible
WARNING: Running pip install with root privileges is generally not a good idea. Try `pip3 install --user` instead.
Collecting ansible
  Using cached https://files.pythonhosted.org/packages/4b/69/c8aef60ce070fe6872e27db65f588bd0ffe8892a980cd3f4d844d8b72152/ansible-2.9.12.tar.gz
Requirement already satisfied: jinja2 in /usr/local/lib64/python3.6/site-packages (from ansible)
Requirement already satisfied: PyYAML in /usr/local/lib64/python3.6/site-packages (from ansible)
Requirement already satisfied: cryptography in /usr/local/lib64/python3.6/site-packages (from ansible)
Requirement already satisfied: MarkupSafe>=0.23 in /usr/local/lib64/python3.6/site-packages (from jinja2->ansible)
Requirement already satisfied: six>=1.4.1 in /usr/local/lib/python3.6/site-packages (from cryptography->ansible)
Requirement already satisfied: cffi!=1.11.3,>=1.8 in /usr/local/lib64/python3.6/site-packages (from cryptography->ansible)
Requirement already satisfied: pycparser in /usr/local/lib/python3.6/site-packages (from cffi!=1.11.3,>=1.8->cryptography->ansible)
Installing collected packages: ansible
  Running setup.py install for ansible ... done
Successfully installed ansible-2.9.12

下面是pip3 show ansible命令的输出。

[root@ansible1 ~]# pip3 show ansible
Name: ansible
Version: 2.9.12
Summary: Radically simple IT automation
Home-page: https://ansible.com/
Author: Ansible, Inc.
Author-email: info@ansible.com
License: GPLv3+
Location: /usr/local/lib/python3.6/site-packages
Requires: jinja2, PyYAML, cryptography

但是，ansible --version命令返回以下内容。

-bash: /bin/ansible: No such file or directory

同样，/usr/bin/ansible --version：

-bash: /usr/bin/ansible: No such file or directory

pip show ansible命令显示该位置为/usr/local/lib/python3.6/site-packages/ansible。这个目录存在，并且包含许多文件和文件夹，但是没有可以使用的特定配置文件(例如ansible.cfg)或二进制文件(例如ansible) (我最多可以知道)。

Answer 1

Bash 缓存到命令的路径。，如果重新定位了一个命令(在您的例子中似乎是这样)，则bash将不会将其捕获，除非清除该缓存。

您可以使用以下方法从缓存中清除ansible：

hash -d ansible

或使用以下方法清除整个缓存：

hash -r