fix: parallel findPython and findPip

src/python/python.ts

@@ -124,20 +124,33 @@ async function setupPythonSystem(setupDir: string, version: string) {
 }
 
 async function findPython(binDir?: string) {
+  const foundBins = (
+    await Promise.all(
+      ["python3", "python"].map(async (pythonBin) => {
+        try {
           if (binDir !== undefined) {
-    for (const pythonBinPath of ["python3", "python"]) {
-      // eslint-disable-next-line no-await-in-loop
-      if (await pathExists(join(binDir, addExeExt(pythonBinPath)))) {
-        return pythonBinPath
+            if (
+              (await pathExists(join(binDir, addExeExt(pythonBin)))) &&
+              (await isBinUptoDate(pythonBin, DefaultVersions.python!))
+            ) {
+              return pythonBin
             }
           }
+          if (
+            (await which(pythonBin, { nothrow: true })) !== null &&
+            (await isBinUptoDate(pythonBin, DefaultVersions.python!))
+          ) {
+            return pythonBin
           }
-  if (which.sync("python3", { nothrow: true }) !== null) {
-    return "python3"
-  } else if (which.sync("python", { nothrow: true }) !== null && (await isBinUptoDate("python", "3.0.0"))) {
-    return "python"
+        } catch {
+          // ignore
         }
         return undefined
+      })
+    )
+  ).filter((bin) => bin !== undefined)
+
+  return foundBins?.[0]
 }
 
 async function findOrSetupPip(foundPython: string) {
@@ -154,16 +167,22 @@ async function findOrSetupPip(foundPython: string) {
 }
 
 async function findPip() {
-  for (const pip of ["pip3", "pip"]) {
-    if (
-      which.sync(pip, { nothrow: true }) !== null &&
-      // eslint-disable-next-line no-await-in-loop
-      (await isBinUptoDate(pip, DefaultVersions.pip!))
-    ) {
+  const foundBins = (
+    await Promise.all(
+      ["pip3", "pip"].map(async (pip) => {
+        try {
+          if ((await which(pip, { nothrow: true })) !== null && (await isBinUptoDate(pip, DefaultVersions.pip!))) {
             return pip
           }
+        } catch {
+          // ignore
         }
         return undefined
+      })
+    )
+  ).filter((bin) => bin !== undefined)
+
+  return foundBins?.[0]
 }
 
 async function setupPip(foundPython: string) {

src/versions/default_versions.ts

@@ -29,6 +29,7 @@ export const DefaultVersions: Record<string, string | undefined> = {
   doxygen: isArch() ? "1.9.6-1" : "1.9.7", // https://www.doxygen.nl/download.html // https://packages.ubuntu.com/search?suite=all&arch=any&searchon=names&keywords=doxygen // https://formulae.brew.sh/formula/doxygen // https://archlinux.org/packages/extra/x86_64/doxygen/
   gcc: isArch() ? "13.1.1-1" : "13", // https://github.com/brechtsanders/winlibs_mingw/releases and // https://packages.ubuntu.com/search?suite=all&arch=any&searchon=names&keywords=gcc
   pip: "22.3.1",
+  python: "3.8.0", // min version
 }
 
 /// If an ubuntu versions is not in this map: