#blessed https://stackoverflow.com/a/52784160

function Invoke-Call {
    param (
        [scriptblock]$ScriptBlock,
        [string]$ErrorAction = $ErrorActionPreference
    )
    & @ScriptBlock
    if (($lastexitcode -ne 0) -and $ErrorAction -eq "Stop") {
        exit $lastexitcode
    }
}

Invoke-Call -ScriptBlock {mypy (get-item *.py) } -ErrorAction Stop
Invoke-Call -ScriptBlock {python agmain.py } -ErrorAction Stop
Invoke-Call -ScriptBlock {mypy (get-item gen/*.py) } -ErrorAction Stop