How to get pyreverse to work

[snippsat]

If python is in environment variables path,then eg pyreverse --help shall work from command line(from any place).
It get installed in Scripts(pyreverse.exe) folder root python.
Quick test.

Output:
E:\div_code\class
λ pyreverse --help
Usage:
  pyreverse [options] <packages>

  create UML diagrams for classes and modules in <packages>


Options:
  -h, --help            show this help message and exit
  -f <mode>, --filter-mode=<mode>
                        filter attributes and functions according to
                        <mode>. Correct modes are :
                        'PUB_ONLY' filter all non public attributes
                        [DEFAULT], equivalent to PRIVATE+SPECIAL_A
                        'ALL' no filter                             'SPECIAL'
                        filter Python special functions
                        except constructor                             'OTHER'
                        filter protected and private
                        attributes [current: PUB_ONLY]
  -c <class>, --class=<class>
                        create a class diagram with all classes related to
                        <class>; this uses by default the options -ASmy
                        [current: none]
  -a <ancestor>, --show-ancestors=<ancestor>
                        show <ancestor> generations of ancestor classes not in
                        <projects>
  -A, --all-ancestors   show all ancestors off all classes in <projects>
  -s <association_level>, --show-associated=<association_level>
                        show <association_level> levels of associated classes
                        not in <projects>
  -S, --all-associated  show recursively all associated off all associated
                        classes
  -b, --show-builtin    include builtin objects in representation of classes
  -m [yn], --module-names=[yn]
                        include module name in representation of classes
  -k, --only-classnames
                        don't show attributes and methods in the class boxes;
                        this disables -f values
  -o <format>, --output=<format>
                        create a *.<format> output file if format available.
                        [current: dot]
  --ignore=<file[,file...]>
                        Add files or directories to the blacklist. They should
                        be base names, not paths. [current: CVS]
  -p <project name>, --project=<project name>
                        set the project name. [current: none]

Usage:

# Install graphviz
E:\div_code\class
λ choco install graphviz
Chocolatey v0.10.15
Installing the following packages:
graphviz
By installing you accept licenses for the packages.
Progress: Downloading Graphviz 2.38.0.20190211... 100%
.....
Added C:\ProgramData\chocolatey\bin\dot.exe shim pointed to 'c:\program files (x86)\graphviz2.38\bin\dot.exe'.
The install of graphviz was successful.

# Test pyreverse
E:\div_code\class
λ pyreverse dog_pet.py -a1 -s1
parsing dog_pet.py...

# Use .dot file generated bye pyreverse
E:\div_code\class
λ dot -Tpdf classes.dot -o output.pdf