This the code I'm trying to run it with
import RPi.GPIO as GPIO
import time
LCD_RS = 18
LCD_E = 23
LCD_D4 = 12
LCD_D5 = 16
LCD_D6 = 20
LCD_D7 = 21

LCD_WIDTH = 20
LCD_CHR = True
LCD_CMD = False

LCD_LINE_1 = 0x80
LCD_LINE_2 = 0xC0
LCD_LINE_3 = 0x94
LCD_LINE_4 = 0xD4  # Often the start of the fourth line

E_PULSE = 0.0005
E_DELAY = 0.0005

def lcd_init():
    # Initialize GPIO
    GPIO.setmode(GPIO.BCM)
    GPIO.setwarnings(False)
    GPIO.setup(LCD_E, GPIO.OUT)
    GPIO.setup(LCD_RS, GPIO.OUT)
    GPIO.setup(LCD_D4, GPIO.OUT)
    GPIO.setup(LCD_D5, GPIO.OUT)
    GPIO.setup(LCD_D6, GPIO.OUT)
    GPIO.setup(LCD_D7, GPIO.OUT)

    # Power on delay
    time.sleep(0.1)

    # Initialization sequence
    lcd_byte(0x33, LCD_CMD)
    time.sleep(0.005)
    lcd_byte(0x33, LCD_CMD)
    time.sleep(0.005)
    lcd_byte(0x32, LCD_CMD)
    time.sleep(0.005)
    lcd_byte(0x28, LCD_CMD)  # 4-bit mode, 2 lines, 5x7 font
    lcd_byte(0x08, LCD_CMD)  # Display off, cursor off, blink off
    lcd_byte(0x01, LCD_CMD)  # Clear display
    time.sleep(0.005)
    lcd_byte(0x06, LCD_CMD)  # Entry mode: increment cursor, no shift
    lcd_byte(0x0C, LCD_CMD)  # Display on, cursor off, blink off

def lcd_byte(bits, mode):
    # Send byte to data pins
    GPIO.output(LCD_RS, mode)

    # High bits
    GPIO.output(LCD_D4, False)
    GPIO.output(LCD_D5, False)
    GPIO.output(LCD_D6, False)
    GPIO.output(LCD_D7, False)
    if bits & 0x10 == 0x10:
        GPIO.output(LCD_D4, True)
    if bits & 0x20 == 0x20:
        GPIO.output(LCD_D5, True)
    if bits & 0x40 == 0x40:
        GPIO.output(LCD_D6, True)
    if bits & 0x80 == 0x80:
        GPIO.output(LCD_D7, True)

    # Toggle Enable pin
    time.sleep(E_DELAY)
    GPIO.output(LCD_E, True)
    time.sleep(E_PULSE)
    GPIO.output(LCD_E, False)
    time.sleep(E_DELAY)

    # Low bits
    GPIO.output(LCD_D4, False)
    GPIO.output(LCD_D5, False)
    GPIO.output(LCD_D6, False)
    GPIO.output(LCD_D7, False)
    if bits & 0x01 == 0x01:
        GPIO.output(LCD_D4, True)
    if bits & 0x02 == 0x02:
        GPIO.output(LCD_D5, True)
    if bits & 0x04 == 0x04:
        GPIO.output(LCD_D6, True)
    if bits & 0x08 == 0x08:
        GPIO.output(LCD_D7, True)

    # Toggle Enable pin
    time.sleep(E_DELAY)
    GPIO.output(LCD_E, True)
    time.sleep(E_PULSE)
    GPIO.output(LCD_E, False)
    time.sleep(E_DELAY)

def lcd_string(message, line):
    # Send string to LCD at specified line
    message = message.ljust(LCD_WIDTH, " ")
    lcd_byte(line, LCD_CMD)
    for i in range(LCD_WIDTH):
        lcd_byte(ord(message[i]), LCD_CHR)

def main():
    # Main program block
    lcd_init()

    try:
        lcd_string("Line 1: Hello!", LCD_LINE_1)
        lcd_string("Line 2: From Pi", LCD_LINE_2)
        lcd_string("Line 3: 20x4 LCD", LCD_LINE_3)
        lcd_string("Line 4: Test!", LCD_LINE_4)

        time.sleep(5)  # Keep the message displayed for longer

    finally:
        GPIO.cleanup()

if __name__ == '__main__':
    main()