1.5. Loops in Python

For Loops

Many objects in Python are “iterable” meaning we can iterate over every element in the object
- Such as element in a list or characters in a string
- Can use For Loops to execute a block of code for every iteration
Syntax of a for loop:

my_iterable = [1,2,3]

for item_name in my_iterable:

print(item_name)

>>1

>>2

>>3

Examples:

mylist = [1,2,3,4,5]

for num in mylist:

#Check for even

if num % 2 == 0:

print(num)

else:

print(f"Odd Number: {num}")

Odd Number: 1

Odd Number: 3

Odd Number: 5

Generate two sets of arrays representing the value of dice thrown by two dice players. For each throw, the larger number win the set. If the number thrown is the same, it is a draw.

import numpy as np

for x in range(5):

    p1 = np.random.randint(6,size=5)

    p2 = np.random.randint(6,size=5)

    print("Player 1", "\n", p1)

    print("Player 2", "\n", p2)

    p1score = 0

    p2score = 0

    for y in range(5):

        if p1[y] > p2[y]:

            p1score += 1

        elif p1[y] < p2[y]:

            p2score += 1

    if p1score > p2score:

        print("Player 1 wins by", (p1score - p2score), "game")

    elif p1score < p2score:

        print("Player 2 wins by", (p2score - p1score), "game")

    else:

        print("It is a draw with", (p1score), "win each.")

Player 1

[3 1 5 1 0]

Player 2

[3 2 1 2 0]

Player 2 wins by 1 game

Player 1

[1 0 2 3 2]

Player 2

[4 5 2 3 4]

Player 2 wins by 3 game

Player 1

[5 1 1 5 0]

Player 2

[1 2 0 3 1]

Player 1 wins by 1 game

Player 1

[1 1 1 4 5]

Player 2

[0 4 0 4 2]

Player 1 wins by 2 game

Player 1

[3 4 5 4 1]

Player 2

[0 3 5 3 3]

Player 1 wins by 2 game

Create a function to determine if a given pass code is well-formed.

def check_validity(pw):

    for word in pw:

        if "#" in word:

            position = word.index("#")

            part1 = word[:position]

            part2 = word[position+1:]

            if ((part1.isalnum() or ("." in part1[1:-1]) == True) and (".." not in part1)):

                if (part2.isalnum() == True) and len(set(part2)) == len(part2): #returns a boolean, True if the string has no repeating characters, False otherwise

                    print(word, "is valid")

                else:

                    print(word, "is not valid")

            else:

                print(word, "is not valid")

        else:

            print(word, "is not valid")

cases = ['abc#abc', '1#patch', 'a.b#cd9', '12to13#timesup', 'a.b.c#987', '.ab#123', 'a..b#123', 'ab.#123',

                 'ab.c#1.23', '1234.abc', 'ab12#pass', 'ab-12#past', 'ab12#pas$']

check_validity(cases)

#{i for i in part2 if part2.count(i) == 1}

#(len(part2) == len(set(part2))

abc#abc is valid

1#patch is valid

a.b#cd9 is valid

12to13#timesup is valid

a.b.c#987 is valid

.ab#123 is not valid

a..b#123 is not valid

ab.#123 is not valid

ab.c#1.23 is not valid

1234.abc is not valid

ab12#pass is not valid

ab-12#past is not valid

ab12#pas$ is not valid

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