webinar-for-loops-2021-11-13

# 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...

myList = ["Agent Scully", "Agent Mulder", "Walter Skinner", "CSM", "Mr. X"]

# for _loop_variable_ in _someContainer_:
for item in myList:
    print(item)

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

myString = "Just sit right back and you'll hear a tale."
for char in myString:
    # if char.isupper():
    #   print(char)
    print(char, end=" ")
print()
print(myString)

tvLovesDCT = {
    "Joannie": "Chaci",
    "Buffy": "Angel",
    "Mulder": "Scully",
    "The Mandalorian": "Grogu"
}
# myDictionary[someKey] = someValue

for key in tvLovesDCT:
    # print(key)
    print("{} loves {}".format(key, tvLovesDCT[key]))
# if "Mulder" in tvLovesDCT:
#   print("found!")
# if "Scully" in tvLovesDCT:
#   print("found?")
for k, v in tvLovesDCT.items():
    print("{} --> {}".format(v, k))

# for n in 5: # can't do that!
for n in range(0, 5):
    print(n)

# WHILE LOOP differences
x = 0 # we must instantiate the variable
while x < 5: # we must think of a useful condition
    print("{} is still less than 5".format(x))
    x += 1 # we have to do this: increment/decrement/change the variable

# FOR LOOP with INDEX position
# combine range() and len()
for i in range(0, len(myList)):
    print(i, end=": ")
    print(myList[i])

# Lab 6.14 example
x = int(input())
while x > 0:
    print(x % 2, end="")
    x = int(x / 2)
print()

# Question, how can I reverse that?
# To reverse it, you have to store it so you have something to work with.
# Remember print() doensn't store anything for later.
x = int(input())
while x > 0:
    print(x % 2, end="")
    x = int(x / 2)
print()

strX = ""
while x > 0:
    strX += str(x%2)
    x = int(x/2)
print(strX)
# reverse it... and print() the reverse...
print(strX[::-1])
# But if you're asking because of the similar Lab 7.21...
# the CONTEXT of the questions in Lab 6.14 and Lab 7.21 differs!!!
# Lab 7.21 involves two FUNCTIONS that each have a single job
# one to get the binary
# the second to reverse the result of the first
# note that this involves return values, not printing directly

# Lab 23.5 example
# Declare variable to hold running count.
count = 0

low = int(input())
high = int(input())
x = int(input())

for i in range(low, high + 1):
    if i % x == 0:
        count = count + 1

print(count)