alenaPy · pahniki · Mar 3, 2019
diff --git a/hw6.py b/hw6.py
@@ -0,0 +1,62 @@
+"""Homework 6. Currency"""
+
+import requests
+
+URL = "http://apilayer.net/api/live" \
+      "?access_key=6997e85b90d3e726efd245f0da74d982"
+
+
+def get_currency_table(url) -> dict:
+    r = requests.get(url, stream=True)
+
+    if not r.status_code:
+        raise RuntimeError("Request failed")
+
+    return r.json()["quotes"]
+
+
+KOEFS_TABLE = get_currency_table(URL)
+
+
+class Money(float):
+
+    def __new__(self, value: float, cur_type: str = "USD"):
+        """Overwriting required for all immutable type objects"""
+        return super().__new__(self, value / KOEFS_TABLE["USD" + cur_type])
+
+    def __init__(self, value: float, cur_type: str = "USD"):
+        self.cur_type = cur_type
+        self.usd_koef = KOEFS_TABLE["USD" + self.cur_type]
+
+        float.__init__(value / self.usd_koef)
+
+    def __str__(self):
+        return "{:0.4f} {}".format(self * self.usd_koef, self.cur_type)
+
+    def __add__(self, other):
+        usd_count = float.__add__(self, other)
+        return Money(usd_count * self.usd_koef, self.cur_type)
+
+    def __radd__(self, other):
+        if other == 0:
+            return self
+        else:
+            return NotImplemented
+
+
+if __name__ == '__main__':
+    by = Money(10, "BYN")
+    eu = Money(10, "EUR")
+    us = Money(10)
+    print(by)
+    print(eu)
+    print(by + eu)
+
+    print(by + 3.11 * eu + us * 0.8)
+
+    a = sum([by, eu, us])
+    b = sum([us, eu, by])
+    print(a)
+    print(b)
+
+    print(a == b)