Add pickn.py.

pickn.py

@@ -0,0 +1,29 @@
+import argparse
+import sys
+
+from voussoirkit import pipeable
+
+def shuffle_argparse(args):
+    if args.count < 1:
+        pipeable.stderr('count must be >= 1.')
+        return 1
+
+    lines = pipeable.input(args.source, read_files=True, skip_blank=True, strip=True)
+    lines = list(lines)
+    lines = lines[:args.count]
+
+    for line in lines:
+        pipeable.stdout(line)
+
+def main(argv):
+    parser = argparse.ArgumentParser(description=__doc__)
+
+    parser.add_argument('source')
+    parser.add_argument('count', type=int)
+    parser.set_defaults(func=shuffle_argparse)
+
+    args = parser.parse_args(argv)
+    return args.func(args)
+
+if __name__ == '__main__':
+    raise SystemExit(main(sys.argv[1:]))