webinar-for-loops-2021-06-05

# WEBINAR: for loops

# We use loops to repeat actions
# a WHILE loop 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 LOOP syntax with a list
myList = ["Agent Scully", "Agent Mulder", "Walter Skinner", "CSM", "Mr. X"] # X-Files characters
for item in myList:
    print(item)

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

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

scoobies = {
    "Scooby": "a blue collar",
    "Shaggy": "green",
    "Velma": "orange",
    "Daphne": "purple",
    "Fred": "an ascot"
}
for key in scoobies: # loop var for a dictionary is the KEY
    # someDictionary[someKey] --> retrieve the value for the key
    print(key, "-", scoobies[key])

# if you REALLY want a var for key and value
for k, v in scoobies.items():
    print(k, "-->", v)
    print(k, "------>", scoobies[k])

# if you're as interested in the INDEX position as you the ITEM/VALUE
for i, item in enumerate(myList):
    # print(i, item)
    print(i, myList[i])

for n in range(0, 5):
    print(n)

for i in range(len(myString)):
    print(i, myString[i])


# Complete the function to return the number of upper case letters in the given string
def countUpper(mystring):
    # string class method: .isupper()
    count = 0
    for char in mystring:
        if char.isupper():
            count += 1
    return count

print(countUpper('Welcome to WGU')) # 4
print(countUpper('Hello Mary')) # 2

print("--- 25's in 1 to 100:")
count = 0 # if you're "accumulating" or "filling the basket" create those vars BEFORE the loop...
numList = []
for num in range(1, 101):
    if num % 25 == 0:
        print(num)
        numList.append(num) # ... then add to them within the loop...
        count += 1
print(count)  # and remember they're not done until the loop is over (back one level of indentation)
print(numList)


print("--- 37's in 1 to 10000:")
for num in range(1, 10001):
    if num % 43 == 0:
        print(num)