# A simple string example
short_string_variable = "Have a great week, Ninjas !"
print(short_string_variable)

# Print the first letter of a string variable, index 0
first_letter_variable = "New York City"[0]
print(first_letter_variable)

# Mixed upper and lower case letter variable
mixed_letter_variable = "ThIs Is A MiXeD VaRiAbLe"
print(mixed_letter_variable.lower())

# Length of the variable
print(len(mixed_letter_variable))

# Use '+' sign inside a print command
first_name = "David"
print("First name is : " +first_name)


# Replace a part of a string
first_serial_number = "ABC123"
print("Changed serial number #1 : " +first_serial_number.replace('123' , '456'))

# Replace a part of a string -> Twice !
second_serial_number = "ABC123ABC"
print("Changed serial number #2 : " +second_serial_number.replace('ABC' , 'ZZZ' , 2))

# Take a part of a variable, according to specific index range
range_of_indexes = second_serial_number[0:3]
print(range_of_indexes)

# One last thing - adding spaces between multiple variables in print
first_word = "Thank"
second_word = "you"
third_word = "NINJAS !"

print(first_word +" " +second_word +" " +third_word)

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