Add Python directories to Windows command shell (cmd.exe)

python_env.bat

@rem  Base Python directory
@set PythonPath=%USERPROFILE%\AppData\Local\Programs\Python\Python35

@REM  I'm assuming command extensions are off and Perl is installed :\
@REM  Make temporary directory to hold new path information, since I have to set it through an intermediate file?
@cd %USERPROFILE%
@if not exist tmp mkdir tmp

@REM Add path(s) to environment path, keeping order but avoiding duplicates (I hope)
@echo Adding python command directories to the current environment:
@perl -e "my @ordered = split(/;/, $ENV{PATH}); push @ordered, @ARGV;  for my $p (@ordered) { next if exists $u{$p}; $u{$p} = 1; push @clean, $p; } my $np = join q(;), @clean; print $np . qq(\n);" "%PythonPath%" "%PythonPath%\Scripts" > %USERPROFILE%\tmp\_newpath
@set /P PATH=< %USERPROFILE%\tmp\_newpath

@rem  Not strictly necessary
@echo %path%