webinar-for-loops-2023-09-09

# 2023 Sept 9
# 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 (list, str, tuples, sets, dictionary, range objects)

# Basic syntax of a for loop
# for ___ in _someContainer_:

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

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

# string
myString = "It was the best\n of times."
for char in myString:
    # print(char)
    # print(f"{char} is alphabetical? {char.isalpha()}")
    print(f"{char} is a kind of whitespace? {char.isspace()}")

# dictionaries
# {key:value, key:value}
# myDict[key] # retrieve the value for that key
# myDict[key] = value # assign a value for that key

# for _key_ in myDict:
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:
    # "Check out Episode ___ or '___'"
    # var key holds each key as I loop
    # corresponding value is bestOfXF[key]
    val = bestOfXF[key]
    # print(f"Check out Episode {key} or '{bestOfXF[key]}'")
    print(f"Check out Episode {key} or '{val}'")

# range()... a range object, which we use to loop a number of times
for num in range(0, 5): # --> [0, 1, 2, 3, 4]
    print(num)

# using range() to correspond to index
for i in range(len(myList)):
    print(f"Position {i} is: {myList[i]}")

# or... use enumerate() to get index and value
for i, item in enumerate(myList):
    print(f"Position {i} is --> {item}")