AT command test code for the ESP8266 WiFi module

esp8266_test.py

#! /usr/bin/env python
# codeing: utf-8

import serial

def send_normal_command(cmd):
    ser.write(cmd)
    rcv_buf = ""
    while rcv_buf != "OK\r\n":
        rcv_buf = ser.readline()
        print rcv_buf

def parse_IPD(buf):
    if "+IPD" not in buf:
        return
    resp = buf.split(',')[2].split(':')
    for i in range(0, int(resp[0])):
        print i, "{0:0>3d}".format(ord(resp[1][i])), resp[1][i]

    print resp

ser = serial.Serial('/dev/tty.usbserial-DA01M7DU', 115200, timeout=2)

send_normal_command("AT\r\n")
send_normal_command("AT+GMR\r\n")
send_normal_command("AT+CWMODE=3\r\n")
send_normal_command("AT+CIPMUX=1\r\n")
send_normal_command("AT+CWDHCP=1,1\r\n")
send_normal_command("AT+CWJAP=\"elecom2g-FF7168\",\"7491896150355\"\r\n")

send_normal_command("AT+CIFSR\r\n")
send_normal_command("AT+CIPSTART=0,\"UDP\",\"8.8.8.8\",53\r\n")
send_normal_command("AT+CIPSEND=0,26\r\n")

# wait for input prompt ">"
rcv_buf = ""
while rcv_buf != ">":
    rcv_buf = ser.read()
    print rcv_buf

buf = [0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 4, 'm', 'b', 'e', 'd', 3, 'o', 'r', 'g', 0, 0, 1, 0, 1]
ser.write(buf)
rcv_buf = ""
while rcv_buf != "SEND OK\r\n":
    rcv_buf = ser.readline()
    print rcv_buf

rcv_buf = ""
while "+IPD" not in rcv_buf:
    rcv_buf = ser.readline()
    print rcv_buf
    parse_IPD(rcv_buf)

send_normal_command("AT+CIPCLOSE=0\r\n")

ser.close()

Iam new to arduino programming,can u help me in learning & interfacing with ESP8266 module.
iam unable to receive any response when try send AT command.