Python3 configuration and entry.md

[ TOC]

0 x00 basic configuration####

IDLE shortcut

ALT + p  #Last command executed

(1) Python Shell clear screen method

For Python command line os.system('cls')
Command line ctrl + l for IDLE Shell

"""
Clear Window Extension
Add these lines to config-extensions.def

[ ClearWindow]
enable=1
enable_editor=0
enable_shell=1[ClearWindow_cfgBindings]
clear-window=<Control-Key-l>"""

classClearWindow:

 menudefs =[('options',[None,('Clear Shell Window','<<clear-window>>'),]),]
     
 def __init__(self, editwin):
  self.editwin = editwin
  self.text = self.editwin.text
  self.text.bind("<<clear-window>>", self.clear_window2)

  self.text.bind("<<undo>>", self.undo_event)  # add="+" doesn't work

 def undo_event(self, event):
  text = self.text
        
  text.mark_set("iomark2","iomark")
  text.mark_set("insert2","insert")
  self.editwin.undo.undo_event(event)

  # fix iomark and insert
  text.mark_set("iomark","iomark2")
  text.mark_set("insert","insert2")
  text.mark_unset("iomark2")
  text.mark_unset("insert2")
        

 def clear_window2(self, event): # Alternative method
  # work around the ModifiedUndoDelegator
  text = self.text
  text.undo_block_start()
  text.mark_set("iomark2","iomark")
  text.mark_set("iomark",1.0)
  text.delete(1.0,"iomark2 linestart")
  text.mark_set("iomark","iomark2")
  text.mark_unset("iomark2")
  text.undo_block_stop()if self.text.compare('insert','<','iomark'):
   self.text.mark_set('insert','end-1c')
  self.editwin.set_line_and_column()

 def clear_window(self, event):
  # remove undo delegator
  undo = self.editwin.undo
  self.editwin.per.removefilter(undo)

  # clear the window, but preserve current command
  self.text.delete(1.0,"iomark linestart")if self.text.compare('insert','<','iomark'):
   self.text.mark_set('insert','end-1c')
  self.editwin.set_line_and_column()
 
  # restore undo delegator
  self.editwin.per.insertfilter(undo)

(2) Python multi-version coexistence
The way I often use is to add one to the PATH, and the other version does not add to python; but the pain is that each execution needs to specify the absolute path, and when pip downloads, it also needs to be executed in the specified directory;
Solution:

# Python&#39;s own solution
When installing python2.After 7 directly call pip to execute Python2.7 pip,How to solve?
pip3 install xxxx
py -3-m pip install xxxx

# Question 1: Set the Python version opened by right-clicking on the &quot;Edit with IDLE&quot; option under win10.
# solution:
1. Enter regedit at the runtime to enter the registry;
2. Found item[HKEY_CLASSES_ROOT\Python.File\shell\Edit with IDLE\command]3.Double click (default) and change the value to:"C:\Python34\pythonw.exe""C:\Python34\Lib\idlelib\idle.pyw"-e "%1"Can

# Question 2: How to specify double-click to open.py file program?
# Solution: At this time, it is generally useless to modify the &quot;Open Method&quot; of &quot;Properties&quot;, because Python is very willful and there is no way.......

# It still needs to be resolved by modifying the registry.
1. Enter regedit at the runtime to enter the registry;
2. Found item[HKEY_CLASSES_ROOT\Python.File\shell\open\command]3.Double click (default) and change the value to:"C:\Python34\python.exe""%1"%*OK (here I want to double-click to use Python3.4 Open).
4. At the same time C:\Python34;C:\Python34\Scripts are added to the environment variable (right click &quot;this computer&quot;->&quot;Advanced System Settings&quot;->&quot;Environmental Variables(N)...&quot;, modify the PATH variable of the user environment variable).

# Question 3: If Python2 exists in your system at the same time.7 and Python3.4. Then enter Python in the command line mode, the default is to execute Python2.7：
# Because Python itself is set to be compatible in the command line mode
$ python 
$ py -3
C:\Users\Administrator>py -2
Python 2 not found!
Installed Pythons found by py Launcher for Windows
 -3.7-64*

# Additional skills:
When my code needs to use Python2.At 7 o&#39;clock, select execute with the right mouse button.
In the registry: HKEY_CLASSES_ROOT\Python.File\shell\New item in &quot;via Python2.7Run&quot;, then create a new item &quot;command&quot;, set the default value to:"C:\Python27\python.exe""%1"%*Can

WeiyiGeek. Right-click to open

0 x01 pip command

It is recommended to use pip for management of python dependent libraries. If pip is not installed, the following commands can be executed to install:

# General Python environment
wget https://sec.ly.com/mirror/get-pip.py --no-check-certificate && python get-pip.py

# Ubuntu, Kail test
apt-get install python-pip
apt-get install python-setuptools
easy_install pip
pip gevent --upgrade
pip install --upgrade pip

# Note: If the last step is incorrectly executed
[ email protected]:pip install setuptools --no-use-wheel --upgrade

Question 1: Install module C++ runtime error report*

error: Microsoft Visual C++ 14.0 is required. Get it with “Microsoft Visual C++ Build Tools”: https://visualstudio.microsoft.com/downloads/

Python 2.7 requires Microsoft Visual C++ 9.0 library Python 3.6 requires Microsoft Visual C++ 14.0 library

0 x02 Into the pit####

Q Question 1: How to solve the failure when installing pip under centos?*

# Solution 1: Install the extension source EPEL first,EPEL(http://fedoraproject.org/wiki/EPEL)It is created by the Fedora community to provide high-quality software packages for RHEL and derivative distributions such as CentOS, Scientific Linux, etc.
# First install the epel extension source:
$ sudo yum -y install epel-release
# Then install pip
$ sudo yum -y install python-pip
 
# Solution 2: If you have not installed pip,You can execute the following command to install:
wget https://sec.ly.com/mirror/get-pip.py --no-check-certificate && python get-pip.py

# Update to the latest version of pip:
$ pip install -U pip
$ python -m pip install --upgrade pip

Q: An error is reported when entering the pip command: from pip import main ImportError: cannot import name'main'*
Reason: After upgrading the pip version on ubuntu 16.04:
The error is as follows:

 workspace> pip
Traceback(most recent call last):
 File "/usr/bin/pip", line 9,in<module>from pip import main
ImportError: cannot import name main

Repair process:

# If compulsory saving under read-only permission will cause file damage, it is recommended to check whether you have permission before modifying the configuration file
$vim /usr/bin/pip

from pip import __main__  #Modify this line
if __name__ =='__main__':  
 sys.exit(__main__._main())#increase__main__._

# Finally save and view
workspace> pip -V              
pip 19.1.1from/home/coding/.local/lib/python2.7/site-packages/pip(python 2.7)

Q: Failed to install BeautifulSoup*
Cause Analysis:

1 ) It may be that the PIP version is too low and the installation is unsuccessful. At present, the version 10.0.1 is used, and the latest version 18.1 is available;
2 ) It may also be that the installation package is wrong, and you need to install the BeautifulSoup4 package. If you do not upgrade the PIP, the BeautifulSoup4 package is successfully installed.

**Question 1: Use pip3 to install Certbot error **
Problem Description:

Command python setup.py egg_info failed with error code 1in/tmp/pip_build_root/cryptography
Storing debug log for failure in/root/.pip/pip.log

Solution:

easy_install -U setuptools
sudo pip3 install certbot

Question 2: The setuptools version is too old and the dependencies cannot be downloaded
Problem Description:

RuntimeError: cryptography requires setuptools 18.5 or newer, please upgrade to a newer version of setuptool

Solution:

pip install --upgrade setuptools

pip command

pip list   #View all dependent packages
pip freeze #View the newly installed packages of the virtual environment
pip install xxx  #Install xxx dependency package

Pypi image acceleration configuration of pip installation module

# temporary use
pip install -i https://pypi.tuna.tsinghua.edu.cn/simple some-package

# Used by default
# Upgrade pip to the latest version(>=10.0.0)After configuration/
pip install pip -U
pip install -i https://pypi.tuna.tsinghua.edu.cn/simple pip -U  #If the default source network connection of the above upgrade connection is poor, temporarily use this command to upgrade pip;
pip config set global.index-url https://pypi.tuna.tsinghua.edu.cn/simple
# Writing to C:\Users\WeiyiGeek\AppData\Roaming\pip\pip.ini

Question 1. ModuleNotFoundError: No module named'pip' error occurs when executing pip command
The cause of the problem: the pip module is not installed in the system
Solution:

python -m ensurepip
python -m pip install --upgrade pip