London | 26-ITP-July | Raihan Sharif | Sprint 4 | implement cowsay

implement-cowsay/cow.py

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+import cowsay
+import sys
+import argparse
+
+
+#  set up options and argument parser
+parser = argparse.ArgumentParser(
+    prog="cowsay command line tool",
+    description="Make animals say things")
+
+# takes an --animal option, which takes a limited set of argument - names of characters in cowsay
+parser.add_argument("--animal", choices=cowsay.char_names, help="The animal to be saying things.", default="cow")
+
+# nargs takes a list of multiple (n) args to a list then perform one action. '*' means multiple 
+# optional arguments, all collected into the message option since this is defined after the --animal option, 
+# it will gather everything after the argument for the animal option
+parser.add_argument("message", nargs="*", help="The message to say")
+
+# parses the args into a Namepace class, e.g. Namespace(animal='fox', message=['hello,', 'starfox'])
+args = parser.parse_args()
+
+# list of positional arguments as space-separated string
+message = " ".join(args.message)
+
+# call cowsay with the animal and message
+print(cowsay.get_output_string(args.animal, message))

implement-cowsay/requirements.txt

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+cowsay
+argparse