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 @@
+import requests
+from dateutil.parser import parse 
+
+def get_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()
+    if data["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"]
+    return last_updated_datetime, exchange_rates
+        
+        
+
+def convert_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
+    return last_updated_datetime, exchange_rates[dst] * amount
+
+
+if __name__ == "__main__":
+    import sys
+    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 @@
+import requests
+from datetime import date, datetime
+
+API_KEY = "8c3dce10dc5fdb6ec1f555a1504b1373"
+# API_KEY = "<YOUR_API_KEY_HERE>"
+
+
+def convert_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()
+    if data["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"])
+        return last_updated_datetime, exchange_rate * amount
+    
+    
+def convert_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()
+    if data["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"]
+        return last_updated_datetime, result
+        
+
+    
+if __name__ == "__main__":
+    import sys
+    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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+import requests
+from bs4 import BeautifulSoup as bs
+import re
+from dateutil.parser import parse
+
+def convert_currency_xe(src, dst, amount):
+    def get_digits(text):
+        """Returns the digits and dots only from an input `text` as a float
+        Args:
+            text (str): Target text to parse
+        """
+        new_text = ""
+        for c in text:
+            if c.isdigit() or c == ".":
+                new_text += c
+        return float(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:])
+    return last_updated_datetime, get_digits(exchange_rate_html.text)
+    
+    
+if __name__ == "__main__":
+    import sys
+    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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+import requests
+from bs4 import BeautifulSoup as bs
+from dateutil.parser import parse
+from pprint import pprint
+
+
+def get_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 = {}
+    for exchange_table in exchange_tables:
+        for tr in exchange_table.find_all("tr"):
+            # for each row in the table
+            tds = tr.find_all("td")
+            if tds:
+                currency = tds[0].text
+                # get the exchange rate
+                exchange_rate = float(tds[1].text)
+                exchange_rates[currency] = exchange_rate        
+    return price_datetime, exchange_rates
+
+
+if __name__ == "__main__":
+    import sys
+    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 @@
+import yahoo_fin.stock_info as si
+from datetime import datetime, timedelta
+
+def convert_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
+    return last_updated_datetime, latest_price * amount
+
+
+if __name__ == "__main__":
+    import sys
+    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

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+python-dateutil
+requests
+bs4
+yahoo_fin