Fix Issue CiscoDevNet#6 - add commands from slides

Author: hpreston

programming_fundamentals/python_part_3/data_library_exercises.py

@@ -0,0 +1,80 @@
+#! /usr/bin/env python
+"""
+Learning Series: Network Programmability Basics
+Module: Programming Fundamentals
+Lesson: Python Part 3
+Author: Hank Preston <hapresto@cisco.com>
+
+data_library_exercises.py
+Illustrate the following concepts:
+- Commands from slides exploring data interactions 
+"""
+
+# XML 
+print("Treat XML like Python Dictionaries with xmltodict\n\n")
+import xmltodict 
+from pprint import pprint 
+
+xml_example = open("xml_example.xml").read() 
+pprint(xml_example)
+
+xml_dict = xmltodict.parse(xml_example)
+int_name = xml_dict["interface"]["name"]
+print(int_name)
+
+print(xmltodict.unparse(xml_dict))
+
+print("\n\n")
+
+# JSON 
+print("To JSON and back again with json\n\n")
+import json 
+from pprint import pprint 
+
+json_example = open("json_example.json").read()
+pprint(json_example)
+
+json_python = json.loads(json_example)
+int_name = json_python["ietf-interfaces:interface"]["name"]
+print(int_name)
+
+print(json.dumps(json_python))
+
+print("\n\n")
+
+# YAML 
+print("YAML? Yep, Python Can Do That Too!\n\n")
+import yaml 
+from pprint import pprint 
+
+yml_example = open("yaml_example.yaml").read() 
+pprint(yml_example)
+
+# Note: The video used the yaml.load() method. This method 
+#  has security vulnerabilities and has been deprecated. The 
+#  yaml.safe_load() method is the suggested way to load YAML
+#  data now.
+# You can read about this at https://msg.pyyaml.org/load
+yaml_python = yaml.safe_load(yml_example)
+int_name = yaml_python["ietf-interfaces:interface"]["name"]
+print(int_name)
+
+print(yaml.dump(yaml_python))
+
+print("\n\n")
+
+# CSV
+print("Import Spreadsheets and Data with csv\n\n")
+import csv 
+from pprint import pprint 
+
+csv_example = open("csv_example.csv").read() 
+pprint(csv_example)
+
+csv_example = open("csv_example.csv")
+csv_python = csv.reader(csv_example)
+
+for row in csv_python: 
+    print("{} is in {} and has IP {}.".format(row[0], row[2], row[1]))
+
+print("\n\n")