webinar-for-loops-2023-03-04

# 2023 Feb 4
# 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)

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

# strings
myString = "It was the best of times."
# for char in myString:
#     print(char) # print(char, end="\n")

# printing on the same line... overriding the end parameter of print()
for char in myString:
    print(char, end="-")
print() # get the new line back
# print("I want this on a new line.") # good way to check yourself

# dictionaries
# myDict = {"key": "value"}
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"
}
# myDict[key] # retrieves the value associated with the key
# bestOfXF["1x00"] # "Pilot"
# # myDict[key] = value # assign a value to that key
for key in bestOfXF:
    print("Check out Episode {} or '{}'".format(key, bestOfXF[key]))

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

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


# Student Questions

# nested loops
# inner loop cycles completes in entirety once PER every cylce of outer loop, like multiplication...
# one of these for every one of those
rows = [1, 2, 3]
cols = ["a", "b", "c", "d", "e"]

for r in rows:
    for c in cols:
        print("{}-{}".format(r, c))
# 1-a
# 1-b
# 1-c
# 1-d
# 1-e
# 2-a
# 2-b
# 2-c
# 2-d
# 2-e
# 3-a
# 3-b
# 3-c
# 3-d
# 3-e