webinar-for-loops-2022-10-08

# 2022 Oct 8
# WEBINAR: For Loops

# We use loops to repeat actions

# a WHILE loop... btw.. is basically an IF statement
# that repeats as long as its condition is 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 __ in _someContainer_:

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

for item in myList:
    print(item, end=" ")
print()

print("Something else on a clean line...")

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

# strings
myString = "It was the best of times. \nIt was the\t worst of times."
# for char in myString:
#     print(char)

# side note: string is___() methods
for char in myString:
    if char.isupper():
        print(char)

# "fill the basket" of a new container
newStr = ""
for char in myString:
    if not char.isspace():
        newStr += char
print(newStr)

# use str.replace()
# just a literal space... myString = myString.replace(" ", "")
for char in myString:
    if char.isspace():
        myString = myString.replace(char, "")
print(myString)

# dictionaries
# myDict[key] # retrieve the value for that key
# myDict[key] = value # assign a value to that key

#for _key_ in myDict: # loop var holds the KEY, whatever we name it

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:
    # print: Check out Episode KEY or 'VALUE'
    print("Check out Episode {} or '{}'!".format(key, bestOfXF[key])) # myDict[key] gets the value

# range()
# the RANGE object and just doing things some # of times
for num in range(5): # range(0, 5)
    print(num)

# looping over a list but interested in indices (that's when I use "i" as a var name)
for i in range(len(myList)):
    print("{}: {}".format(i, myList[i]))

# Student question: Can you use help() and dir() in C859 v4/D335 OA?
# Yes! They're built-in functions and part of Python

# help(str)
# print(dir(str))