updated contents from Atlas repo

decorators/currency.py

@@ -0,0 +1,50 @@
+# currency.py
+
+"""
+>>> convert(1, 'BRL', 'USD')
+0.4591
+>>> convert(1, 'USD', 'BRL')
+2.1784
+>>> convert(1, 'EUR', 'USD')
+1.3482
+>>> convert(1, 'USD', 'EUR')
+0.7417
+>>> convert(1, 'EUR', 'BRL')
+2.9369
+>>> convert(1, 'BRL', 'EUR')
+0.3405
+
+>>> from functools import partial
+>>> eur = partial(convert, cur_to='EUR')
+>>> eur(1, 'USD')
+0.7417
+>>> eur(1, 'BRL')
+0.3405
+>>> eur2brl = partial(convert, cur_from='EUR', cur_to='BRL')
+>>> eur2brl(100)
+293.6864
+>>> type(eur2brl)
+<class 'functools.partial'>
+"""
+
+DEMO = """
+>>> eur2brl.func
+<function convert at 0x1010c5560>
+>>> eur2brl.args, eur2brl.keywords
+((), {'cur_from': 'EUR', 'cur_to': 'BRL'})
+"""
+
+rates = {'BRL': 2.17836,
+         'CAD': 1.03615,
+         'CNY': 6.10562,
+         'EUR': 0.74173,
+         'GBP': 0.62814,
+         'INR': 61.8685,
+         'JPY': 98.6002,
+         'USD': 1.0}
+
+reference = rates['USD']
+
+def convert(amount, cur_from, cur_to):
+    ref_amount = reference / rates[cur_from] * amount
+    return round(ref_amount * rates[cur_to], 4)