Add more exercises, update PCCH to use CLI arguments

.gitignore

@@ -1 +1,2 @@
 out.txt
+Python3HardWay.pdf

caeser-cipher.py

@@ -1,10 +1,21 @@
+# Python Caeser Cipher Helper v1.0.1
+# Usage (encrypt): python3 caeser-cipher.py encrypt secretmessage
+# Usage (decrypt): python3 caeser-cipher.py decrypt secretmessage
+
 import re # Import Regex tools
 import string # Import string tools
-import collections
+import collections # Import tools to sort letters.
+from sys import argv # Import tool to process command line arguments.
 
-ciphertext = input("Please type in your cipher text:") # Set variable cipertext to the input from user.
+#if action == "help": # If error, print help https://stackoverflow.com/questions/4042452/display-help-message-with-python-argparse-when-script-is-called-without-any-argu
+    #print("\nUsage (encrypt): python3 caeser-cipher.py encrypt secretmessage")
+    #print("Usage (decrypt): python3 caeser-cipher.py decrypt secretmessage\n")
+
+script, action, ciphertext = argv # Take command line input.
+
+#ciphertext = input("Please type in your cipher text:") # Set variable cipertext to the input from user.
 shiftNum = input("Please enter the shift used (Just hit enter if you don't know):") # Get input
-action = input("Please enter encrypt or decrypt):") # Get input
+#action = input("Please enter encrypt or decrypt):") # Get input
 ciphertext = re.sub (r'([^a-zA-Z ]+?)', '', ciphertext) # Remove all non-letters.
 ciphertext = ciphertext.lower() # Make it all lowercase. https://www.geeksforgeeks.org/isupper-islower-lower-upper-python-applications/
 letters = list(string.ascii_lowercase) # Use a list of lowercase letters. https://stackoverflow.com/questions/43918437/how-to-iterate-through-the-alphabet

ex12_ss.py

@@ -0,0 +1,39 @@
+
+age = int(input("How old are you?" ))
+#age = print("How old are you?" , input()) # It's asking for input before prompting the user.
+height = input(f"You're {age}? Nice. How tall are you? ")
+weight = input("How much do you weigh? ")
+
+print(f"So, you're {age} old, {height} tall and {weight} heavy.")
+
+# {age} printed in absence of f
+
+# open() allows you to open files in this syntax:
+#open(name[, mode[, buffering]]) -> file object
+
+# Likea so: with open('out.txt', 'w') as f: # W = write f = var to be used later.
+#    print("." * 1000000000, file=f)  # A little fun with a billion dots being saved to a file.
+
+#file(name[, mode[, buffering]]) -> file object
+#
+# Pydoc:
+# Open a file.  The mode can be 'r', 'w' or 'a' for reading (default),
+# |  writing or appending.  The file will be created if it doesn't exist
+# |  when opened for writing or appending; it will be truncated when
+# |  opened for writing.  Add a 'b' to the mode for binary files.
+# |  Add a '+' to the mode to allow simultaneous reading and writing.
+# |  If the buffering argument is given, 0 means unbuffered, 1 means line
+# |  buffered, and larger numbers specify the buffer size.  The preferred way
+# |  to open a file is with the builtin open() function.
+# |  Add a 'U' to mode to open the file for input with universal newline
+# |  support.  Any line ending in the input file will be seen as a '\n'
+# |  in Python.  Also, a file so opened gains the attribute 'newlines';
+# |  the value for this attribute is one of None (no newline read yet),
+# |  '\r', '\n', '\r\n' or a tuple containing all the newline types seen.
+# |
+# |  'U' cannot be combined with 'w' or '+' mode.
+
+# os.curdir is a string representing the current directory ('.' or ':')
+# os.pardir is a string representing the parent directory ('..' or '::')
+# - os.pathsep is the component separator used in $PATH etc
+# - os.linesep is the line separator in text files ('\r' or '\n' or '\r\n')

ex13.py

@@ -0,0 +1,14 @@
+from sys import argv # From sys module, grab the argv feature.
+script, first, second, third, itsaboy = argv # Mapping command line args. $0, $1, $2 $3 name of script, 3 variables
+first = input("You are a cow. Tell me why.")
+print("The script is called:", script)
+print("Your first variable is:", first)
+print("Your second variables is:", second)
+print("Your third variable is:", third)
+print("Your fourth variable is:", itsaboy)
+
+print(">>> argv=", repr(argv))
+# You can break it by not putting the right amount of variables.
+
+hi = input("You are a cow. Tell me why.")
+print(hi)

ex14.py

@@ -0,0 +1,26 @@
+from sys import argv
+
+script, user_name, firstcow = argv
+prompt = '> '
+
+print("How old are you?")
+age = int(input(prompt))
+
+print(f"Hi {user_name}, I'm the {script} script.")
+print("I'd like to ask you a few questions.")
+print(f"Do you like me {user_name}?")
+print("Why are you a cow?")
+likes = input(prompt)
+
+print(f"Where do you live {user_name}?")
+lives = input(prompt)
+
+print("What kind of computer do you have?")
+computer = input(prompt)
+
+print(f"""
+Alright, so you said you're {age} and {likes} about liking me.
+You live in {lives}. Not sure where that is.
+And you have {computer} computer. Nice.
+""")
+print(firstcow)