Add template python scripts for shell scripting and argparse for quic…

…k reference.

templates/argparse.py

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+import argparse
+
+parser = argparse.ArgumentParser()
+parser.add_argument("--silent", action = "store_true")
+parser.add_argument("--repeat", type=int, default = 1)
+args = parser.parse_args()
+
+for i in range(args.repeat):
+  if not args.silent:
+    print("i:", i)

templates/shell.py

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+#!/usr/bin/python3
+# -*- coding: utf-8 -*-
+import subprocess, sys, shlex, threading
+
+def shell(cmd, silent = False):
+  # run shell command string (like 'ls -l') and return a dict containing the stdout and stderr as lists and the return code
+  # the option 'silent' suppresses printing output to stdout during execution
+
+  #{{{
+  proc = subprocess.Popen(shlex.split(cmd),
+      stdout = subprocess.PIPE,
+      stderr = subprocess.PIPE,
+      universal_newlines = True
+      )
+
+  # print output of command while also storing it in lists, separate threads for stdout and stderr
+  # based on https://stackoverflow.com/a/4985080
+  def tee(fd_in, fd_out, target_list):
+    # print fd_in to fd_out and also collect it into a list
+    for line in iter(fd_in):
+      if not silent:
+        fd_out.write(line)
+      target_list.append(line)
+
+  stdout = []
+  stderr = []
+
+  t_stdout = threading.Thread(target=tee, args = (proc.stdout, sys.stdout, stdout))
+  t_stderr = threading.Thread(target=tee, args = (proc.stderr, sys.stderr, stderr))
+  t_stdout.start()
+  t_stderr.start()
+
+  proc.wait()
+
+  t_stdout.join()
+  t_stderr.join()
+
+  #}}}
+
+  ret = {
+      "stdout": stdout,
+      "stderr": stderr,
+      "exit_status": proc.returncode
+      }
+
+  return ret
+
+res = shell("ls -l")
+print(res["stdout"])
+print(res["stderr"])
+print(res["exit_status"])
+
+# vim: set fdm=marker :