add currency converter tutorial

Author: x4nth055

README.md

@@ -115,6 +115,7 @@ This is a repository of all the tutorials of [The Python Code](https://www.thepy
 -[How to Extract YouTube Comments in Python](https://www.thepythoncode.com/article/extract-youtube-comments-in-python). ([code](web-scraping/youtube-comments-extractor))
 -[Automated Browser Testing with Edge and Selenium in Python](https://www.thepythoncode.com/article/automated-browser-testing-with-edge-and-selenium-in-python). ([code](web-scraping/selenium-edge-browser))
 -[How to Automate Login using Selenium in Python](https://www.thepythoncode.com/article/automate-login-to-websites-using-selenium-in-python). ([code](web-scraping/automate-login))
+-[How to Make a Currency Converter in Python](https://www.thepythoncode.com/article/make-a-currency-converter-in-python). ([code](web-scraping/currency-converter))
 
 -### [Python Standard Library](https://www.thepythoncode.com/topic/python-standard-library)
 -[How to Transfer Files in the Network using Sockets in Python](https://www.thepythoncode.com/article/send-receive-files-using-sockets-python). ([code](general/transfer-files/))

web-scraping/currency-converter/README.md

@@ -0,0 +1,12 @@
+# [How to Make a Currency Converter in Python](https://www.thepythoncode.com/article/make-a-currency-converter-in-python)
+To run the scripts:
+-`pip3 install -r requirements.txt`
+- Here is an example: To convert 1000 EUR to USD by scraping Yahoo Finance:
+```
+ $ python currency_converter_yahoofin.py EUR USD 1000
+ ```
+ Output:
+ ```
+ Last updated datetime: 2022-02-02 12:37:39
+ 1000.0 EUR = 1132.6310634613037 USD
+ ```

web-scraping/currency-converter/currency_converter_erapi.py

@@ -0,0 +1,33 @@
+importrequests
+fromdateutil.parserimportparse
+
+defget_all_exchange_rates_erapi(src):
+url=f"https://open.er-api.com/v6/latest/{src}"
+# request the open ExchangeRate API and convert to Python dict using .json()
+data=requests.get(url).json()
+ifdata["result"] =="success":
+# request successful
+# get the last updated datetime
+last_updated_datetime=parse(data["time_last_update_utc"])
+# get the exchange rates
+exchange_rates=data["rates"]
+returnlast_updated_datetime, exchange_rates
+
+
+
+defconvert_currency_erapi(src, dst, amount):
+# get all the exchange rates
+last_updated_datetime, exchange_rates=get_all_exchange_rates_erapi(src)
+# convert by simply getting the target currency exchange rate and multiply by the amount
+returnlast_updated_datetime, exchange_rates[dst] *amount
+
+
+if__name__=="__main__":
+importsys
+source_currency=sys.argv[1]
+destination_currency=sys.argv[2]
+amount=float(sys.argv[3])
+last_updated_datetime, exchange_rate=convert_currency_erapi(source_currency, destination_currency, amount)
+print("Last updated datetime:", last_updated_datetime)
+print(f"{amount}{source_currency} = {exchange_rate}{destination_currency}")
+

web-scraping/currency-converter/currency_converter_fixerapi.py

@@ -0,0 +1,47 @@
+importrequests
+fromdatetimeimportdate, datetime
+
+API_KEY="8c3dce10dc5fdb6ec1f555a1504b1373"
+# API_KEY = "<YOUR_API_KEY_HERE>"
+
+
+defconvert_currency_fixerapi_free(src, dst, amount):
+"""converts `amount` from the `src` currency to `dst` using the free account"""
+url=f"http://data.fixer.io/api/latest?access_key={API_KEY}&symbols={src},{dst}&format=1"
+data=requests.get(url).json()
+ifdata["success"]:
+# request successful
+rates=data["rates"]
+# since we have the rate for our currency to src and dst, we can get exchange rate between both
+# using below calculation
+exchange_rate=1/rates[src] *rates[dst]
+last_updated_datetime=datetime.fromtimestamp(data["timestamp"])
+returnlast_updated_datetime, exchange_rate*amount
+
+
+defconvert_currency_fixerapi(src, dst, amount):
+"""converts `amount` from the `src` currency to `dst`, requires upgraded account"""
+url=f"https://data.fixer.io/api/convert?access_key={API_KEY}&from={src}&to={dst}&amount={amount}"
+data=requests.get(url).json()
+ifdata["success"]:
+# request successful
+# get the latest datetime
+last_updated_datetime=datetime.fromtimestamp(data["info"]["timestamp"])
+# get the result based on the latest price
+result=data["result"]
+returnlast_updated_datetime, result
+
+
+
+if__name__=="__main__":
+importsys
+source_currency=sys.argv[1]
+destination_currency=sys.argv[2]
+amount=float(sys.argv[3])
+# free account
+last_updated_datetime, exchange_rate=convert_currency_fixerapi_free(source_currency, destination_currency, amount)
+# upgraded account, uncomment if you have one
+# last_updated_datetime, exchange_rate = convert_currency_fixerapi(source_currency, destination_currency, amount)
+print("Last updated datetime:", last_updated_datetime)
+print(f"{amount}{source_currency} = {exchange_rate}{destination_currency}")
+

web-scraping/currency-converter/currency_converter_xe.py

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+importrequests
+frombs4importBeautifulSoupasbs
+importre
+fromdateutil.parserimportparse
+
+defconvert_currency_xe(src, dst, amount):
+defget_digits(text):
+"""Returns the digits and dots only from an input `text` as a float
+ Args:
+ text (str): Target text to parse
+ """
+new_text=""
+forcintext:
+ifc.isdigit() orc==".":
+new_text+=c
+returnfloat(new_text)
+
+url=f"https://www.xe.com/currencyconverter/convert/?Amount={amount}&From={src}&To={dst}"
+content=requests.get(url).content
+soup=bs(content, "html.parser")
+exchange_rate_html=soup.find_all("p")[2]
+# get the last updated datetime
+last_updated_datetime=parse(re.search(r"Last updated (.+)", exchange_rate_html.parent.parent.find_all("div")[-2].text).group()[12:])
+returnlast_updated_datetime, get_digits(exchange_rate_html.text)
+
+
+if__name__=="__main__":
+importsys
+source_currency=sys.argv[1]
+destination_currency=sys.argv[2]
+amount=float(sys.argv[3])
+last_updated_datetime, exchange_rate=convert_currency_xe(source_currency, destination_currency, amount)
+print("Last updated datetime:", last_updated_datetime)
+print(f"{amount}{source_currency} = {exchange_rate}{destination_currency}")
+

web-scraping/currency-converter/currency_converter_xrates.py

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+importrequests
+frombs4importBeautifulSoupasbs
+fromdateutil.parserimportparse
+frompprintimportpprint
+
+
+defget_exchange_list_xrates(currency, amount=1):
+# make the request to x-rates.com to get current exchange rates for common currencies
+content=requests.get(f"https://www.x-rates.com/table/?from={currency}&amount={amount}").content
+# initialize beautifulsoup
+soup=bs(content, "html.parser")
+# get the last updated time
+price_datetime=parse(soup.find_all("span", attrs={"class": "ratesTimestamp"})[1].text)
+# get the exchange rates tables
+exchange_tables=soup.find_all("table")
+exchange_rates={}
+forexchange_tableinexchange_tables:
+fortrinexchange_table.find_all("tr"):
+# for each row in the table
+tds=tr.find_all("td")
+iftds:
+currency=tds[0].text
+# get the exchange rate
+exchange_rate=float(tds[1].text)
+exchange_rates[currency] =exchange_rate
+returnprice_datetime, exchange_rates
+
+
+if__name__=="__main__":
+importsys
+source_currency=sys.argv[1]
+amount=float(sys.argv[2])
+price_datetime, exchange_rates=get_exchange_list_xrates(source_currency, amount)
+print("Last updated:", price_datetime)
+pprint(exchange_rates)

web-scraping/currency-converter/currency_converter_yahoofin.py

@@ -0,0 +1,24 @@
+importyahoo_fin.stock_infoassi
+fromdatetimeimportdatetime, timedelta
+
+defconvert_currency_yahoofin(src, dst, amount):
+# construct the currency pair symbol
+symbol=f"{src}{dst}=X"
+# extract minute data of the recent 2 days
+latest_data=si.get_data(symbol, interval="1m", start_date=datetime.now() -timedelta(days=2))
+# get the latest datetime
+last_updated_datetime=latest_data.index[-1].to_pydatetime()
+# get the latest price
+latest_price=latest_data.iloc[-1].close
+# return the latest datetime with the converted amount
+returnlast_updated_datetime, latest_price*amount
+
+
+if__name__=="__main__":
+importsys
+source_currency=sys.argv[1]
+destination_currency=sys.argv[2]
+amount=float(sys.argv[3])
+last_updated_datetime, exchange_rate=convert_currency_yahoofin(source_currency, destination_currency, amount)
+print("Last updated datetime:", last_updated_datetime)
+print(f"{amount}{source_currency} = {exchange_rate}{destination_currency}")

web-scraping/currency-converter/requirements.txt

@@ -0,0 +1,4 @@
+python-dateutil
+requests
+bs4
+yahoo_fin