add examples for debugging methods

scripts/sum_with_logging.py

+import sys
+import logging
+#logging.basicConfig(level=logging.DEBUG)
+logging.basicConfig(filename='example.log', encoding='utf-8', level=logging.DEBUG, format='%(asctime)s :: %(levelname)s :: %(message)s')
+
+def sum(a,b):
+  logging.debug("started method sum()")
+  logging.info("Got a = {0} of type {1}".format(a,type(a)))
+  logging.info("Got b = {0} of type {1}".format(b,type(b)))
+  return a+b
+
+if __name__ == "__main__":
+  a,b = sys.argv[1], sys.argv[2]
+  print("{a}+{b}= {sum}".format(sum=sum(a,b),a=a,b=b))

scripts/sum_with_pdb.py

+import sys
+
+def sum(a,h):
+  return a+h
+
+if __name__ == "__main__":
+  # not some user given numbers
+  a = sys.argv[1]
+  b = sys.argv[2]
+  print("a   = {0}".format(a))
+  print("b   = {0}".format(b))
+  print("sum = {0}".format(sum(a,b)))

scripts/sum_with_print.py

+import sys
+
+def sum(a,h):
+  return a+h
+
+if __name__ == "__main__":
+  # first some tests
+  print("2 = {0}".format(sum(1,1)))
+  print("5 = {0}".format( sum(1,4)))
+  print("4 = {0}".format(sum(2,2)))
+
+  # not some user given numbers
+  a = sys.argv[1]
+  b = sys.argv[2]
+  print("a   = {0}".format(a))
+  print("b   = {0}".format(b))
+  print("sum = {0}".format(sum(a,b)))