{"id":1991,"date":"2024-01-29T18:20:40","date_gmt":"2024-01-29T18:20:40","guid":{"rendered":"https:\/\/www.tutavo.com\/Kachina\/?p=1991"},"modified":"2024-03-02T22:15:45","modified_gmt":"2024-03-02T22:15:45","slug":"learn-python-notes-21-30","status":"publish","type":"post","link":"https:\/\/www.tutavo.com\/Kachina\/learn-python-notes-21-30\/","title":{"rendered":"Learn Python – NOTES 21 – 30"},"content":{"rendered":"

Program 21 – Evaluate for Leap Year<\/strong><\/p>\n

# if the year number isn’t evenly divisible by four, it’s a common year;
\n# otherwise, if the year number isn’t divisible by 100, it’s a leap year;
\n# otherwise, if the year number isn’t divisible by 400, it’s a common year;
\n# otherwise, it’s a leap year.<\/p>\n

# output one of two possible messages, which are Leap year or Common year,
\n# depending on the value entered.<\/p>\n

# verify if the entered year falls into the Gregorian era,
\n# and output a warning otherwise: Not within the Gregorian
\n# calendar period. Tip: use the != and % operators.<\/p>\n

# == Evaluate of two values are equal
\n# % Modulus – Returns remainder ONLY – Discards value to left
\n# \/= ?
\n# != Is not equal to
\n# \/\/ Truncates and disposes of any remainder
\n# ** Exponent<\/p>\n

year = int(input(“Enter a year: “))
\nevaluation = “Not yet evaluated”<\/p>\n

# Write your code here.
\n# Sample input: 2000 – – – Expected output: Leap year
\n# Sample input: 2015 – – – Expected output: Common year
\n# Sample input: 1999 – – – Expected output: Common year
\n# Sample input: 1996 – – – Expected output: Leap year
\n# Sample input: 1580 – – – Expected output: Not within the Gregorian calendar
\n# Robert Test Data – – – – 1111, 2222, 2224, 15555, 15556<\/p>\n

if year <= 1580:
\nevaluation = “Not a Gregorian Date”
\nelif year%4 > 0:
\nevaluation = “This is a common year”
\nelif year%4 == 0:
\nevaluation = “This is a leap year”
\nelif year%2000 == 0:
\nevaluation = “This is a leap year”
\nelif year%100 == 0:
\nevaluation = “This is a leap year”
\nelif year%400 == 0:
\nevaluation = “This is a common year”
\nelse:
\nevaluation = “ERROR DETECTED”<\/p>\n

print (evaluation)<\/p>\n

 <\/p>\n

Program 22 – Send multiple values to multiple variables
\n<\/strong><\/p>\n

x, y, z = 5, 10, 8<\/code><\/p>\n

print(x > z) # False
\nprint((y - 5) == x) # True<\/code><\/p>\n

You can also do: 
\nx, y, z = 5, 10, 8
\nx, y, z = z, y, x<\/code><\/p>\n

Program 23 – Else and Elif
\n<\/strong><\/p>\n

If  True
\n   Executes
\nIf  False
\n   Does not execute
\nIf  True
\n   Executes<\/p>\n

Elif will exit if True<\/p>\n

Program 24 –  Endless While Loops<\/strong><\/code><\/p>\n

\n
\n
while<\/span> True<\/span>:<\/span><\/div>\n
print<\/span>(<\/span>“I’m stuck inside a loop.”<\/span>)<\/span><\/div>\n<\/div>\n<\/div>\n
 <\/div>\n
\n
\n
Exit with ^C<\/div>\n
 <\/div>\n<\/div>\n<\/div>\n

Program 25 – Equivalent expressions
\n<\/strong><\/p>\n

Try to recall how Python interprets the truth of a condition, and note that these two forms are equivalent:
\n       while number != 0:<\/code> and while number:<\/code>.
\nThe condition that checks if a number is odd can be coded in these equivalent forms, too:
\n             if number % 2 == 1:<\/code> and if number % 2:<\/code>.<\/p>\n

Program 26 – Incrementing a Counter – Similar to C<\/strong> <\/p>\n

 counter<\/span> -=<\/span> 1   is the same as   counter = counter-1
\n counter<\/span> +=<\/span> 1   is the same as   counter = counter+1<\/strong><\/span><\/code><\/p>\n

Program 27 – Hurkle – A Game by Robert Andrews
\n<\/strong><\/p>\n

NOTE:  This program works with valid entries.  It will return an error if you enter anything that is not between 1 and 99.<\/p>\n

import random<\/span>
\nsecret_number = random.randint(1, 99)<\/span><\/p>\n

import sys
\n# Multi Line Print
\n<\/span><\/p>\n

print(<\/span>
\n“””<\/span>
\n+============================+<\/span>
\n| Welcome to Robert’s Hurkle.|<\/span>
\n| Guess the Secret Number. |<\/span>
\n+============================+<\/span>
\n“””)<\/span>
\nprint (“The Secret Number is ” + str(secret_number))<\/span><\/p>\n

MyGuess = 0<\/span>
\nguesses = 0<\/span><\/p>\n

while MyGuess != secret_number:<\/span>
\nMyGuess = int(input(“Enter your secret number guess: “))<\/span>
\nif MyGuess > secret_number: hint=”Lower”<\/span>
\nelse: hint= “Higher”<\/span><\/p>\n

if MyGuess == secret_number:<\/span>
\nprint (“Congratulations. You guessed correctly.”)<\/span>
\nprint (“The number is ” + str(MyGuess))<\/span>
\nprint (“it took you ” + str(guesses+1) + ” guesses to get it right.”)<\/span>
\nprint()<\/span>
\nelif MyGuess == 0:<\/span>
\nprint (“The number was ” + str(secret_number) + “.”)<\/span>
\nsys.exit()   # You can also use break<\/span>
\nelse:<\/span>
\nprint (“Wrong. ” + str(MyGuess) + ” is not the number.”)<\/span>
\nprint (“Enter ZERO to give up.”)<\/span>
\nguesses += 1<\/span>
\nprint (“So far, you guessed ” + str(guesses) + ” times.”)<\/span>
\nprint (“The secret number is ” + hint)<\/span>
\nprint()<\/span><\/p>\n

 <\/p>\n

Program 28 – Loops – If and For<\/strong><\/code><\/p>\n

    \n
  1. i<\/span> =<\/span> 0<\/span><\/code><\/li>\n
  2. while<\/span> i<\/span> <<\/span> 100<\/span>:<\/span><\/code><\/li>\n
  3.      # do_something()<\/span><\/code><\/li>\n
  4.      i<\/span> +=<\/span> 1<\/span><\/li>\n<\/ol>\n

     <\/p>\n

      \n
    1. for i in range(100):<\/li>\n
    2.      # do_something()<\/li>\n
    3. pass<\/li>\n<\/ol>\n