errors/warnings during installation

[Andriy Tymchenko]

when I install package, I expect it to install flawlessly without any additional messages

during installation I got this besides other packages installed and then post-processing
---
Setting up mkchromecast (0.3.8.1-1) ...
/usr/share/mkchromecast/mkchromecast/cast.py:103: SyntaxWarning: "is not" with a literal. Did you mean "!="?
  if iface is not None and iface[0]['addr'] is not '127.0.0.1':
/usr/share/mkchromecast/mkchromecast/systray.py:787: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if platform is 'Darwin':
/usr/share/mkchromecast/mkchromecast/systray.py:793: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if platform is 'Linux':
/usr/share/mkchromecast/mkchromecast/systray.py:854: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if platform is 'Darwin' and self.notifications is 'enabled':
/usr/share/mkchromecast/mkchromecast/systray.py:854: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if platform is 'Darwin' and self.notifications is 'enabled':

---

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: mkchromecast 0.3.8.1-1
ProcVersionSignature: Ubuntu 5.4.0-144.161-generic 5.4.229
Uname: Linux 5.4.0-144-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.25
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: MATE
Date: Tue Mar 14 09:36:14 2023
InstallationDate: Installed on 2020-10-25 (870 days ago)
InstallationMedia: Ubuntu-MATE 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
PackageArchitecture: all
SourcePackage: mkchromecast
UpgradeStatus: Upgraded to focal on 2023-01-02 (70 days ago)