Python

ubuntu将默认使用python2更改为默认使用python3的方法

直接执行这两个命令即可：

sudo update-alternatives --install /usr/bin/python python /usr/bin/python2 100 
sudo update-alternatives --install /usr/bin/python python /usr/bin/python3 150

操作剪贴板

import pyperclip 
pyperclip.copy("写入剪贴板的内容") 
url =pyperclip.paste() 
linux error------- 
Traceback (most recent call last): 
File "/home/diao/python/qrcode.py", line 7, in <module> 
   url =pyperclip.paste() 
 File "/usr/local/lib/python3.7/dist-packages/pyperclip/__init__.py", line 640, in lazy_load_stub_paste 
   return paste() 
 File "/usr/local/lib/python3.7/dist-packages/pyperclip/__init__.py", line 303, in __call__ 
   raise PyperclipException(EXCEPT_MSG) 
pyperclip.PyperclipException:  
   Pyperclip could not find a copy/paste mechanism for your system. 
   For more information

解决方法

sudo apt-get install xsel to install the xsel utility. 
sudo apt-get install xclip to install the xclip utility. 
pip install gtk to install the gtk Python module. 
pip install PyQt4 to install the PyQt4 Python module.