116 lines
4.2 KiB
Python
116 lines
4.2 KiB
Python
from datetime import datetime
|
|
import urllib.request
|
|
import xml.etree.ElementTree as ET
|
|
|
|
"""
|
|
this method calls a rss/XML Resource
|
|
of Currency's and parses it to our
|
|
needed exchange rate values.
|
|
The return is a dictionary carring
|
|
Key:Value pairs of new currencys.
|
|
"""
|
|
|
|
|
|
def get_rss(url):
|
|
urlsocket = ''
|
|
try:
|
|
urlsocket = urllib.request.urlopen(url)
|
|
return(urlsocket)
|
|
except urllib.error.URLError as e:
|
|
print('err: urllib.request.urlopen: ', e.reason)
|
|
|
|
|
|
def parse_rss(urlsocket):
|
|
rss_tree = ''
|
|
if urlsocket:
|
|
root = ET.parse(urlsocket)
|
|
rss_tree = ET.ElementTree(root)
|
|
return(rss_tree)
|
|
|
|
|
|
def pass_local_file():
|
|
rss_tree = ET.ElementTree(file='rss')
|
|
return(rss_tree)
|
|
|
|
|
|
def get_exchange_rate(rss_tree, ns):
|
|
# Pathvariables to XML Namespaces with
|
|
rate_path = 'cb:statistics/cb:exchangeRate/'
|
|
observation_path = 'cb:statistics/cb:exchangeRate/cb:observation/'
|
|
exchange_rates = []
|
|
|
|
for item in rss_tree.findall('none:item', ns):
|
|
datetime_str = item.find('dc:date', ns).text
|
|
try:
|
|
date = datetime.strptime(''.join(
|
|
datetime_str.rsplit(':', 1)),
|
|
"%Y-%m-%dT%H:%M:%S%z").strftime(
|
|
"%Y-%m-%d")
|
|
except Exception as e:
|
|
print('%s (%s)' % (e, type(e)))
|
|
try:
|
|
date = datetime.strptime(''.join(
|
|
datetime_str.rsplit(':', 1)),
|
|
"%Y-%m-%dT%H:%M:%S.%f%z").strftime(
|
|
"%Y-%m-%d")
|
|
continue
|
|
except Exception as e:
|
|
print('%s (%s)' % (e, type(e)))
|
|
continue
|
|
# now search for the currency exchange rate:
|
|
target_currency = item.find(rate_path +
|
|
'cb:targetCurrency', ns).text
|
|
value = float(item.find(observation_path +
|
|
'cb:value', ns).text)
|
|
value = float(value) # convert to float
|
|
foreign_value = value # copy to new value to have both.
|
|
|
|
if item.find(observation_path + 'cb:unit_mult', ns) is None:
|
|
# because it's dangerous to check for present,
|
|
# i check for none here and have to set the target
|
|
# to 1. as im multiplying it later.
|
|
unit_mult = float("1.0")
|
|
else:
|
|
# shift left by 2 digits with "/"
|
|
# https://stackoverflow.com/questions/8362792/
|
|
# because some currencys differ widly from CHF
|
|
unit_mult = item.find(observation_path +
|
|
'cb:unit_mult', ns).text
|
|
# unit_mult defaults to '0' so we check for 8 decimal
|
|
# values (2..-6) they represent the fracton value to
|
|
# calculate the correct decimalpoint.
|
|
if unit_mult == '2': # thinking of Bitcoins
|
|
unit_mult = '0.01'
|
|
if unit_mult == '1':
|
|
unit_mult = '0.10'
|
|
if unit_mult == '-1':
|
|
unit_mult = '10'
|
|
if unit_mult == '-2': # Japan Yen
|
|
unit_mult = '100'
|
|
if unit_mult == '-3':
|
|
unit_mult = '1000'
|
|
if unit_mult == '-4':
|
|
unit_mult = '10000'
|
|
if unit_mult == '-5':
|
|
unit_mult = '100000'
|
|
if unit_mult == '-6': # indian rupies
|
|
unit_mult = '1000000'
|
|
unit_mult = float(unit_mult) # convert to float
|
|
# calculate the Currency to CHF:
|
|
foreign_value = 1 / value
|
|
foreign_value *= unit_mult
|
|
value = value / unit_mult
|
|
# truncate it to decimal values provided by the xml:
|
|
foreign_value_round = round(foreign_value, 5)
|
|
# Print nice setup of all calculated currencys for development:
|
|
# print("date:", date, " 1 ", target_currency, " costs: ",
|
|
# CHFvalue, "CHF and 1 ", base_currency, " costs: ",
|
|
# FOREIGNvalue_round, target_currency)
|
|
data = [{'date': date,
|
|
'currency': target_currency,
|
|
'exchangerate': foreign_value_round}]
|
|
exchange_rates.append(data)
|
|
# Print the Dictionary:
|
|
print(exchange_rates)
|
|
return(exchange_rates)
|