ERROR: Package ‘numpy‘ requires a different Python: 2.7.17 not in ‘＞=3.8‘_error: package 'visdom' requires a different pytho

安装numpy

pip install numpy

报错

ERROR: Package 'numpy' requires a different Python: 2.7.17 not in '>=3.8'

解决方案：

指定版本即可：

sudo pip install numpy==1.20.3

rosbag play xx.bag
bash: /opt/ros/melodic/bin/rosbag: /usr/bin/python2: 解释器错误: 没有那个文件或目录

解决方法：

python
Python 2.7.17 (default, Mar  8 2023, 18:40:28) 
[GCC 7.5.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> ls
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'ls' is not defined
>>> import sys
>>> sys.path
['', '/home/ubuntu/ws_livox1/devel/lib/python2.7/dist-packages', '/home/ubuntu/ws_livox/devel/lib/python2.7/dist-packages', '/opt/ros/melodic/lib/python2.7/dist-packages', '/usr/lib/python2.7', '/usr/lib/python2.7/plat-x86_64-linux-gnu', '/usr/lib/python2.7/lib-tk', '/usr/lib/python2.7/lib-old', '/usr/lib/python2.7/lib-dynload', '/home/ubuntu/.local/lib/python2.7/site-packages', '/usr/lib/python2.7/dist-packages', '/usr/lib/python2.7/dist-packages/wx-3.0-gtk3']

按Ctrl+D

找到这个位置

/usr/lib/python2.7

重新建立软链接

sudo ln -s /usr/bin/python2 /usr/bin/python
sudo ln -s /usr/bin/python2.7 /usr/bin/python2