price alert flipkart

price_alert_flipkart.py

#!/usr/bin/python2.7

import re

import requests
from envelopes import Envelope, SMTP
from lxml import etree
from splinter import Browser

REGEX_FIND_NUMBER = re.compile(r'\d*\.\d+|\d+')
REGEX_FIND_COMMA = re.compile(r'\s*,\s*')
AWS_SES_SMTP_SERVER = SMTP(
    host='email-smtp.us-east-1.amazonaws.com',
    port=587,
    login='',
    password='',
    tls=True,
)
USER_AGENT = "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.95 Safari/537.36"
PHANTOM_JS_SERVICE_ARGS = [
    '--proxy=127.0.0.1:8123',
    '--proxy-type=http',
]


def get_price_from_text(text):
    # strip the text
    text = text.strip()
    # remove comma
    text = REGEX_FIND_COMMA.sub('', text)
    # find decimal string
    decimals = REGEX_FIND_NUMBER.findall(text)
    # price string should be first one
    price_string = decimals[0]
    # convert to float and return
    return float(price_string)


def get_text_for_etree_node(node):
    # get text for current node
    text = node.text or ''
    # get tail for current node
    tail = node.tail or ''
    # get text for all children
    children_text = ''.join(map(get_text_for_etree_node, node))

    return text + children_text + tail


def get_price_from_amazon(url):
    req = requests.get(url)
    root = etree.HTML(req.text)
    target_element = root.find(".//span[@id='priceblock_ourprice']")
    target_element_text = get_text_for_etree_node(target_element)
    price = get_price_from_text(target_element_text)
    return price


def get_price_from_flipkart(browser, url):
    JAVASCRIPT_CODE_EXTRACT_PRICES = """
    function getElementsByClassName(class_name) {
      var elements = document.getElementsByClassName("selling-price");
      var results = new Array();

      for (var i = 0; i < elements.length; i++) {
        results.push(elements[i]);
      }

      return results;
    }

    function getElementsByXpath(xpath) {
      var results = document.evaluate(
        xpath,
        document,
        null,
        XPathResult.ORDERED_NODE_SNAPSHOT_TYPE,
        null
      );
      var elements = []
      for (var J = 0; J < results.snapshotLength; ++J) {
        elements.push(results.snapshotItem(J));
      }
      return elements;
    }

    // SELLING_PRICES = getElementsByClassName("selling-price").map(function(x){return x.textContent});

    SELLING_PRICES = getElementsByXpath('//*[@data-omnifield="eVar48"]').map(function(x) {
      return x.textContent
    });
    """
    browser.visit(url)
    browser.execute_script(JAVASCRIPT_CODE_EXTRACT_PRICES)
    SELLING_PRICES = browser.evaluate_script("""SELLING_PRICES""")

    return min(map(get_price_from_text, SELLING_PRICES))


def send_email_for_price_alert(website_name, url, price, item_name):
    envelope = Envelope(
        from_addr=(u'from@example.com', u'Price Alert'),
        to_addr=(u'to@example.com', u'Your name'),
        subject=u'Price Alert: {} - INR {}/- - {}'.format(website_name, price, item_name),
        text_body=u"""
Item - {item_name}.
Price - INR {price}/-
URL - {url}

-
Sent using Price Alert Python Script
""".format(item_name=item_name, price=price, url=url)
    )
    AWS_SES_SMTP_SERVER.send(envelope)


FLIPKART_WATCH_LIST = [
    [
        "http://www.flipkart.com/lenovo-thinkpad-e431-notebook-3rd-gen-ci7-4gb-500gb-win8-2gb-graph-touch/p/itmdxsvwgjfww7ds",
        "Lenovo Thinkpad E431 Notebook (3rd Gen Ci7/ 4GB/ 500GB/ Win8/ 2GB Graph/ Touch)(Black)",
        50000,
    ]
]


if __name__ == "__main__":
    browser = Browser(
        "phantomjs",
        user_agent=USER_AGENT,
        service_args=PHANTOM_JS_SERVICE_ARGS,
    )

    for (url, item_name, min_price) in FLIPKART_WATCH_LIST:
        price = get_price_from_flipkart(browser, url)
        website_name = "Flipkart.com"
        if price <= min_price:
            send_email_for_price_alert(website_name, url, price, item_name)

    browser.quit()

import error. no module named 'requests' .help me out of this error