The initialization of the LCD1602 Module implemented by Python

LCD1602_init.py

import RPi.GPIO as GPIO

from time import sleep
def init():
    GPIO.setmode(GPIO.BCM)
    RS = 20
    RW = 21 
    EN = 26
    D4 = 19
    D5 = 13
    D6 = 6
    D7 = 5
    GPIO.setup(EN,  GPIO.OUT) 
    GPIO.setup(RS, GPIO.OUT) 
    GPIO.setup(RW, GPIO.OUT) 
    GPIO.setup(D4, GPIO.OUT)
    GPIO.setup(D5, GPIO.OUT)
    GPIO.setup(D6, GPIO.OUT)
    GPIO.setup(D7, GPIO.OUT)
    GPIO.output(D4,0)
    GPIO.output(D5,0)
    GPIO.output(D6,0)
    GPIO.output(D7,0)
    GPIO.output(RS,0)
    GPIO.output(RW,0)
    GPIO.output(EN,0)

    sleep(0.1)
    GPIO.output(EN,1)
    sleep(0.000001)
    GPIO.output(EN,0)
    sleep(0.002)

    GPIO.output(D5,1)

    GPIO.output(EN,1)
    sleep(0.000001)
    GPIO.output(EN,0)
    sleep(0.005)

    GPIO.output(EN,1)
    sleep(0.000001)
    GPIO.output(EN,0)
    sleep(0.0002)

    GPIO.output(EN,1)
    sleep(0.000001)
    GPIO.output(EN,0)
    sleep(0.0002)

    write_command(0x28)
    sleep(0.0001)
    write_command(0x0c)
    sleep(0.0001)
    write_command(0x01)
    sleep(0.002)

init()