webinar-for-loops-2023-05-06

# 2023 May 6
# WEBINAR: For Loops

# We use loops to repeat actions

# a WHILE loop... is an IF that repeats as long as the loop condition remains True

# FOR LOOPS are used for repeating actions for every element
# in a container like a list, string, tuple, etc...

# Basic syntax of a for loop
# for __someVar__ in __someContainer__:

# list
myList = ["Agent Scully", "Agent Mulder", "Walter Skinner", "CSM", "Mr. X"]
for item in myList:
    print(item)

# strings
myString = "It was the best of times."
# for char in myString:
#     print(char, end="-")
# print() # if you ever override end, make sure to get the "normal" line return back
# print("This should start on a clean line by itself.") # check yourself! Delete or comment out later

# for char in myString:
#     if not char.isspace():
#         print(char)

# tuples
myTuple = ("Gilligan", "Castaway002", "red", "crew")
for item in myTuple:
    print(item)

# dictionaries
# myDict = {"key": "value"}
# myDict[key] # retrieves the value for the key
# myDict[key] = value # assign a (new) value to a key
bestOfXF = {
    "1x00": "Pilot",
    "2x10": "Red Museum",
    "2x14": "Die Hand Die Verletzt",
    "3x04": "Clyde Bruckman's Final Repose",
    "3x12": "War of the Coprophages",
    "3x20": "Jose Chung's From Outer Space",
    "4x05": "The Field Where I Died",
    "5x05": "The Post Modern Prometheus",
    "5x17": "All Souls"
}

for key in bestOfXF: # what does the loop var hold?
    # value for that key... bestOfXF[key]
    # value = bestOfXF[key] # you could assign a var for that if you wanted to
    print("Check out Episode {} or '{}'".format(key, bestOfXF[key]))

# range()
for num in range(0, 5): # [0, 1, 2, 3, 4]
    print(num)

# Interested in the index and the item/value in a list???
myList.append("Queequeg")
myList.append("Krycek")

for i in range(0, len(myList)):
    print("{} - {}".format(i, myList[i]))

# you can use enumerate()
for i, item in enumerate(myList):
    print("{} > {}".format(i, item))

# Student Questions
# # question on reversing (not really about For Loops...)
# myStr = "Hello"
# revStr = myStr[::-1] # myStr[start:stop:step]

# Lab 33.10
''' Type your code here. '''
user_input = input()
quitCommands = ["Done", "done", "d"] # I like to make a list of sentinel values if there's more than 1

# while user_input != "quit": # if there was only one quit command for a sentinel value
# check individually as separate conditions...
# while user_input != "Done" and user_input != "done" and user_input != "d":
# or...
while not user_input in quitCommands:
    # do our stuff
    print(user_input[::-1])
    # at the end, get the next input for the loop's next iteration
    user_input = input()