Standard Deviation Function

main.py

import time
import requests
import statistics

def get_exchange_rate(base_currency, target_currency, api_url):
    response = requests.get(api_url)
    data = response.json()
    if 'rates' in data and target_currency in data['rates']:
        return data['rates'][target_currency]
    else:
        raise ValueError("Invalid API response or currency not found")

def calculate_standard_deviation(base_currency, target_currency, api_url, duration=600, interval=60):
    price_diffs = []
    end_time = time.time() + duration
    
    while time.time() < end_time:
        try:
            rate1 = get_exchange_rate(base_currency, target_currency, api_url)
            rate2 = get_exchange_rate(target_currency, base_currency, api_url)
            price_diffs.append(abs(rate1 - rate2))
        except Exception as e:
            print(f"Error fetching data: {e}")
        
        time.sleep(interval)
    
    if len(price_diffs) > 1:
        return statistics.stdev(price_diffs)
    else:
        return "Not enough data to calculate standard deviation."

# Example usage (replace 'API_URL' with a valid API endpoint):
API_URL = "https://api.exchangerate-api.com/v4/latest/USD"
base_currency = "USD"
target_currency = "EUR"

dev = calculate_standard_deviation(base_currency, target_currency, API_URL)
print(f"Standard Deviation: {dev}")