Added main program

Author: thmsklngr

README.md

@@ -1,3 +1,10 @@
-# moses-shares
+# Summenberechnung
+
+Usage:
+```
+Usage: python main.py num num [num ...]
+
+    <num> can be either float or integer
+    minimum amount of arguments is two
+```
 
-Ein Repo zu Übungszwecken ... :)

main.py

@@ -0,0 +1,38 @@
+import sys
+import re
+
+
+def parse_str(num):
+    """
+    Parse a string that is expected to contain a number.
+    :param num: str. the number in string.
+    :return: float or int. Parsed num.
+    """
+    if not isinstance(num, str): # optional - check type
+        raise TypeError('num should be a str. Got {}.'.format(type(num)))
+    if re.compile('^\s*\d+\s*$').search(num):
+        return int(num)
+    if re.compile('^\s*(\d*\.\d+)|(\d+\.\d*)\s*$').search(num):
+        return float(num)
+    raise ValueError('num is not a number. Got {}.'.format(num)) # optional
+
+
+def sum_all(values: list) -> int:
+    summary = 0
+    for val in values:
+        _v = parse_str(val)
+        summary += _v
+    return summary
+
+if len(sys.argv) < 3:
+    usage = '''Usage: python main.py num num [num ...]
+
+    <num> can be either float or integer
+    minimum amount of arguments is two
+    '''
+    print(usage)
+    sys.exit(1)
+
+summary = sum_all(sys.argv[1:])
+
+print(f"Die Summe ist: {summary}")