client-clear.py: initialer commit

initialer commit for a client, who pushs a status of one or zero to the server. if no argument
in cli, the client gives a commandline input to read.

client-clear.py

@@ -0,0 +1,64 @@
+#!/usr/bin/python3
+# -*- coding: utf-8 -*-
+
+# file: client-clear.py
+# date: 26.07.2019
+# email: berhsi@web.de
+
+# client, who connects to localhost port 64000. If no status is given, he
+# reads from commandline until input is 0 or 1.
+
+import socket
+from sys import exit, argv
+from kodierung import string2bytes
+
+
+def check_arguments(argv):
+    
+    if len(argv) == 1:
+        value = None
+    else:
+        if argv[1].strip() == '0' or argv[1].strip() == '1':
+            value = argv[1].strip()
+            print('Set value to {}'.format(value))
+        else:
+            value = None
+    return value
+
+
+def read_argument():
+
+    status = None
+
+    while status == None:
+        buf = input('Enter new status (0/1): ')
+        if buf == '0' or buf == '1':
+            status = buf
+        return buf
+
+
+def main():
+
+    HOST = '127.0.0.1'
+    PORT = 64000
+    STATUS = None
+
+    if check_arguments(argv) == None:
+        STATUS = read_argument()
+    else:
+        STATUS = check_arguments(argv)
+
+    with socket.socket(socket.AF_INET, socket.SOCK_STREAM, 0) as mySocket:
+        print('Socket created')
+        mySocket.connect((HOST, PORT))
+        try:
+            print('Send new status: {}'.format(STATUS))
+            bytestream = string2bytes(STATUS)
+            mySocket.send(bytestream)
+        except Exception as e:
+            print('Error: {}'.format(e))
+            exit()
+
+
+if __name__ == '__main__':
+    main()