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I have a problem i first thought many would experience, but i couldn't find any similar questions. The language i'm using is Python.

I want to read a specific value from a website, which is embedded in another code behind. I first thought this approach here could work. (Downloading the html page, then reading a specific line). But the problem is, that the value i am looking for is generated constantly in another class or code. So basically when i tried to look at the html-code with Chrome, i couldn't find my preferred value.

The page i am trying to read: Page. The value i need is the Price per Ether in Euro.

I appreciate your help!

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  • Welcome to SO, please be a bit more specific when asking question: what have you tried, what do you expect, etc. See how to ask Commented Jul 27, 2016 at 12:52
  • If the value was generated by javascript you will need something like selenium to extract it Commented Jul 27, 2016 at 12:53
  • I basically downloaded the html of the page and searched for the value. But the value is created by a javascript-function. So how can i access the value i need with code in python? Commented Jul 27, 2016 at 12:54
  • I should add that i just started learning to code, so have mercy with me :) Commented Jul 27, 2016 at 12:55
  • I just confirmed that the page is created with javascript. So google selenium and you will find some examples how to proceed. Commented Jul 27, 2016 at 12:56

2 Answers 2

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The data on the page comes from an XHR loaded json blob, which it is possible to query directly.

>>> import requests >>> import pprint >>> r = requests.get('http://ether.price.exchange/update') >>> pprint.pprint(r.json()) {u'AUD': {u'15m': 873.83, u'buy': 873.83, u'last': 873.83, u'sell': 873.85, u'symbol': u'$'}, u'BRL': {u'15m': 2140.39, u'buy': 2140.39, u'last': 2140.39, u'sell': 2140.42, u'symbol': u'R$'}, u'CAD': {u'15m': 860, u'buy': 860, u'last': 860, u'sell': 860.02, u'symbol': u'$'}, u'CHF': {u'15m': 643.67, u'buy': 643.67, u'last': 643.67, u'sell': 643.68, u'symbol': u'CHF'}, u'CLP': {u'15m': 428297.17, u'buy': 428297.17, u'last': 428297.17, u'sell': 428303.73, u'symbol': u'$'}, u'CNY': {u'15m': 4359.5, u'buy': 4359.5, u'last': 4359.5, u'sell': 4359.56, u'symbol': u'\xa5'}, u'DKK': {u'15m': 4416.7, u'buy': 4416.7, u'last': 4416.7, u'sell': 4416.76, u'symbol': u'kr'}, u'EUR': {u'15m': 593.66, u'buy': 593.66, u'last': 593.66, u'sell': 593.67, u'symbol': u'\u20ac'}, u'GBP': {u'15m': 496.02, u'buy': 496.02, u'last': 496.02, u'sell': 496.02, u'symbol': u'\xa3'}, u'HKD': {u'15m': 5062.79, u'buy': 5062.79, u'last': 5062.79, u'sell': 5062.87, u'symbol': u'$'}, u'ISK': {u'15m': 79579.79, u'buy': 79579.79, u'last': 79579.79, u'sell': 79581.01, u'symbol': u'kr'}, u'JPY': {u'15m': 69110.23, u'buy': 69110.23, u'last': 69110.23, u'sell': 69111.28, u'symbol': u'\xa5'}, u'KRW': {u'15m': 742032.87, u'buy': 742032.87, u'last': 742032.87, u'sell': 742044.24, u'symbol': u'\u20a9'}, u'NZD': {u'15m': 933.8, u'buy': 933.8, u'last': 933.8, u'sell': 933.82, u'symbol': u'$'}, u'PLN': {u'15m': 2589.46, u'buy': 2589.46, u'last': 2589.46, u'sell': 2589.5, u'symbol': u'z\u0142'}, u'RUB': {u'15m': 42472.95, u'buy': 42472.95, u'last': 42472.95, u'sell': 42473.6, u'symbol': u'RUB'}, u'SEK': {u'15m': 5637.68, u'buy': 5637.68, u'last': 5637.68, u'sell': 5637.77, u'symbol': u'kr'}, u'SGD': {u'15m': 887.79, u'buy': 887.79, u'last': 887.79, u'sell': 887.81, u'symbol': u'$'}, u'THB': {u'15m': 22835.96, u'buy': 22835.96, u'last': 22835.96, u'sell': 22836.31, u'symbol': u'\u0e3f'}, u'TWD': {u'15m': 20965.35, u'buy': 20965.35, u'last': 20965.35, u'sell': 20965.67, u'symbol': u'NT$'}, u'USD': {u'15m': 652.7, u'buy': 652.7, u'last': 652.7, u'sell': 652.71, u'symbol': u'$'}, u'baseVolume': u'71691.55099130', u'high': u'0.02070000', u'high24hr': u'0.02070000', u'highestBid': u'0.01957006', u'id': 148, u'isFrozen': u'0', u'last': u'0.01956700', u'low': u'0.01760000', u'low24hr': u'0.01760000', u'lowestAsk': u'0.01958372', u'percentChange': u'0.07570270', u'price': u'0.01956700', u'quoteVolume': u'3802775.62565674', u'volume': u'71691.55099130'}

Reading the javascript in the page, the price of 1 ether in a currency is 1 * data['price'] * data['EUR']['last']:

>>> r = requests.get('http://ether.price.exchange/update') >>> d = r.json() >>> float(d['price']) * float(d['EUR']['last']) 11.562597087999999
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3 Comments

Worth noting that at time of writing, there appears to be a bug on the website that the per currency value updated periodically is always the USD calculation even after you've selected a different currency from the dropdown.
Thank's anyway! Where did you see that the data is coming from a json blob?
I guessed that that would be the case and looked for XHR in chrome dev tools.
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I was able to get the value from another webpage. The code looks like this:

def get_current_value(): chrome_path = r"C:\Users\Chris\Desktop\Chrome_driver\chromedriver.exe" driver = webdriver.Chrome(chrome_path) driver.get("https://cryptowatch.de/kraken/etheur") a = driver.find_element_by_xpath("""//*[@id="price-ticker"]""").text unicodedata.normalize("NFD",a)#.encode('ascii','ignore') return a

I added this code here unicodedata.normalize("NFD",a)#.encode('ascii','ignore') to transform the output, which was apparently unicode, to a string.

The problem i face now, is that the output for a is something like : €12.99
How can i remove the euro sign so i can transform the string to a float?

I have to post this as answer since someone downvoted me for no reason so i can't ask another question today..

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I got it finally! Since the euro sign is always the character 0 i can use the following code: a = float(a[1:]). Didn't think it could be so easy :)

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