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Strings

letter = ' '  # Strings can be written in single quotes
words = "Begin..."  # Or double quotes

# Or triple quotes for multi-line strings
morewords = """
I 
am
a
multi-line
string
"""
# String Multiplication: Strings can be multiplied by an integer.
my_str = "Hi! " * 5
# my_str is initialised as "Hi! Hi! Hi! Hi! Hi! "

# Reversing a string
string = "Hello World"
#string = ''.join(reversed(string))
# string becomes 'dlroW olleH'

def setup():
    size(640, 360)
    fill(255)

def draw():
    background(0)  # Set background to black
    # Draw the letter to the center of the screen
    textSize(14)
    # Concatenate (combine) strings by juxtaposition:
    text("Click on the program, "
         "then type to add to the String", 50, 50)
    text("Current key: " + letter, 50, 70)
    text("The String is " + str(len(words)) + " letters long", 50, 90)
    textSize(36)
    text(words, 50, 120)

def keyPressed():
    global letter, words

    # The variable "key" always contains the value
    # of the most recent key pressed.
    if ('A' <= key <= 'z') or key == ' ':
        letter = key
        words += key

        # Hack to bound text to window
        # Remove when rectangular bounding is added for text()
        if len(words) % 30 == 0:
            words += '\n'

        # Write the letter to the console
        println(key)