Arduino and Python Serial Connection with LCD (http://cyberasylum.janithw.com/arduino-and-python-serial-connection-with-lcd/)

ArduinoCode.ino

// include the library code:
#include <LiquidCrystal.h>

// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

void setup() {
  Serial.begin(9600);
  lcd.begin(16, 2);
  lcd.print("start");
}

void loop() {
  if (Serial.available()) {
    delay(100);  //wait some time for the data to fully be read
    lcd.clear();
    while (Serial.available() > 0) {
      char c = Serial.read();
      lcd.write(c);
    }
  }
}

PythonCode.py

import serial
import time

s = serial.Serial(11, 9600) #port is 11 (for COM12, and baud rate is 9600
time.sleep(2)    #wait for the Serial to initialize
s.write('Ready...')
while True:
    str = raw_input('Enter text: ')
    str = str.strip()
    if str == 'exit' :
        break
    s.write(str)