initial creation

py3interm/EXAMPLES/parsing_args.py

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+#!/usr/bin/env python
+import re
+import fileinput
+import argparse
+from glob import glob  # <1>
+from itertools import chain  # <2>
+
+arg_parser = argparse.ArgumentParser(description="Emulate grep with python")  # <3>
+
+arg_parser.add_argument(
+    '-i',
+    dest='ignore_case', action='store_true',
+    help='ignore case'
+)  # <4>
+
+arg_parser.add_argument(
+    'pattern', help='Pattern to find (required)'
+)  # <5>
+
+arg_parser.add_argument(
+    'filenames', nargs='*',
+    help='filename(s) (if no files specified, read STDIN)'
+)  # <6>
+
+args = arg_parser.parse_args()  # <7>
+
+print('-' * 40)
+print(args)
+print('-' * 40)
+
+regex = re.compile(args.pattern, re.I if args.ignore_case else 0)  # <8>
+
+filename_gen = (glob(f) for f in args.filenames)  # <9>
+filenames = chain.from_iterable(filename_gen)  # <10>
+
+for line in fileinput.input(filenames):  # <11>
+    if regex.search(line):
+        print(line.rstrip())