Python error on installing or updating

when i typed the command: sudo apt update then its showing the problem listed below:

tom@boy:~$ sudo apt update
[sudo] password for tom: 
Hit:1 http://ppa.launchpad.net/deadsnakes/ppa/ubuntu focal InRelease
Hit:2 http://packages.microsoft.com/repos/code stable InRelease                                                                                                                                           
Hit:3 http://dl.google.com/linux/chrome/deb stable InRelease                                                                                                                                              
Hit:4 https://packages.microsoft.com/repos/vscode stable InRelease                                                                                                                                        
Hit:5 http://np.archive.ubuntu.com/ubuntu focal InRelease                                 
Hit:6 http://security.ubuntu.com/ubuntu focal-security InRelease    
Hit:7 http://ppa.launchpad.net/sylvain-pineau/kazam/ubuntu focal InRelease
Hit:8 http://np.archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:9 http://np.archive.ubuntu.com/ubuntu focal-backports InRelease
Could not find platform independent libraries <prefix>
Could not find platform dependent libraries <exec_prefix>
Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>]
Python path configuration:
  PYTHONHOME = (not set)
  PYTHONPATH = (not set)
  program name = '/usr/bin/python3'
  isolated = 0
  environment = 1
  user site = 1
  import site = 1
  sys._base_executable = '/usr/bin/python3'
  sys.base_prefix = '/usr'
  sys.base_exec_prefix = '/usr'
  sys.executable = '/usr/bin/python3'
  sys.prefix = '/usr'
  sys.exec_prefix = '/usr'
  sys.path = [
    '/usr/lib/python38.zip',
    '/usr/lib/python3.8',
    '/usr/lib/lib-dynload',
  ]
Fatal Python error: init_fs_encoding: failed to get the Python codec of the filesystem encoding
Python runtime state: core initialized
ModuleNotFoundError: No module named 'encodings'

Current thread 0x00007f135d32d740 (most recent call first):
<no Python frame>
Reading package lists... Done
E: Problem executing scripts APT::Update::Post-Invoke-Success 'if /usr/bin/test -w /var/lib/command-not-found/ -a -e /usr/lib/cnf-update-db; then /usr/lib/cnf-update-db > /dev/null; fi'
E: Sub-process returned an error code

and when i typed the command sudo apt install something then its showing the problem shown below:

tom@boy:~$ sudo apt install wireshark
Reading package lists... Done
Building dependency tree       
Reading state information... Done
wireshark is already the newest version (3.2.3-1).
wireshark set to manually installed.
0 upgraded, 0 newly installed, 0 to remove and 219 not upgraded.
7 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] y
Setting up python2-minimal (2.7.17-2ubuntu4) ...
/var/lib/dpkg/info/python2-minimal.postinst: 4: python2.7: not found
dpkg: error processing package python2-minimal (--configure):
 installed python2-minimal package post-installation script subprocess returned error exit status 127
Errors were encountered while processing:enter code here
 python2-minimal
E: Sub-process /usr/bin/dpkg returned an error code (1)