Python - Control Flow and Logical Operators (Day 3)

This is a 100 Days challenge to learn a new language (Python). 100 Days of Code - The Complete Python Pro Bootcamp 

I will post some notes to motivate myself to finish this challenge.

Conditional Operators

Ex:

if condition:

    if condition:

        # Do something

    else:

        # Do something

elif condition:

    # Do something

else:

    # Do something

NOTE: Unlike other language, Python uses 'elif' instead of 'else if'

Logical Operators

* and

* or

* not

Ex:

input_num = 1

if input_num > 0 and input_num < 5:

    print("Using 'and' not '&&'")

NOTE: Unlike other language, Python uses 'and' instead of '&&'

Note

How to print a long message?   

Ex:

print('''

    abcdefg

    test

    hello

''')

Result:

abcdefg test hello

How to make a string to be lower case?   

Ex:

print("HELLO".lower())

Result:

hello

How to count the character from a string?   

Ex:

print("HELLO".count("H"))

Result:

1

Challenge

Determinate whether the input year is a Leap Year or not

Reference: Documentation Youtube

Ex:

# on every year that is evenly divisible by 4

# **except** every year that is evenly divisible by 100

# **unless** the year is also evenly divisible by 400

year = int(input("Please Input a Year? "))

is_leap_year = False

if year % 4 == 0:

    if year % 100 == 0:

        if year % 400 != 0:

            is_leap_year = False

        else:

            is_leap_year = True

    else:

        is_leap_year = True

if is_leap_year == True:

    print("A leap year")

else:

    print("A common year")

Result:

Please Input a Year? 2020 A leap year