From 740d09d0d08036899d1ced2d825d9ff70acca849 Mon Sep 17 00:00:00 2001
From: Matt Luongo <mhluongo@gmail.com>
Date: Fri, 15 Jan 2016 02:31:32 -0500
Subject: [PATCH] Prefer Decimal over float in utils.

---
 blockcypher/utils.py | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/blockcypher/utils.py b/blockcypher/utils.py
index 91b180b..059229a 100644
--- a/blockcypher/utils.py
+++ b/blockcypher/utils.py
@@ -1,4 +1,5 @@
 import re
+from decimal import Decimal
 
 from .constants import SHA_COINS, SCRYPT_COINS, COIN_SYMBOL_SET, COIN_SYMBOL_MAPPINGS, FIRST4_MKEY_CS_MAPPINGS_UPPER, UNIT_CHOICES, UNIT_MAPPINGS
 from .crypto import script_to_address
@@ -30,7 +31,7 @@ def to_satoshis(input_quantity, input_type):
 
     # convert to satoshis
     if input_type in ('btc', 'mbtc', 'bit'):
-        satoshis = float(input_quantity) * float(UNIT_MAPPINGS[input_type]['satoshis_per'])
+        satoshis = Decimal(input_quantity) * Decimal(UNIT_MAPPINGS[input_type]['satoshis_per'])
     elif input_type == 'satoshi':
         satoshis = input_quantity
     else:
@@ -42,7 +43,7 @@ def to_satoshis(input_quantity, input_type):
 def from_satoshis(input_satoshis, output_type):
     # convert to output_type,
     if output_type in ('btc', 'mbtc', 'bit'):
-        return input_satoshis / float(UNIT_MAPPINGS[output_type]['satoshis_per'])
+        return Decimal(input_satoshis) / Decimal(UNIT_MAPPINGS[output_type]['satoshis_per'])
     elif output_type == 'satoshi':
         return int(input_satoshis)
     else:
@@ -106,15 +107,15 @@ def format_crypto_units(input_quantity, input_type, output_type, coin_symbol=Non
         assert is_valid_coin_symbol(coin_symbol=coin_symbol), coin_symbol
     assert type(round_digits) is int
 
-    satoshis_float = to_satoshis(input_quantity=input_quantity, input_type=input_type)
+    satoshis = to_satoshis(input_quantity=input_quantity, input_type=input_type)
 
     if round_digits:
-        satoshis_float = round(satoshis_float, -1*round_digits)
+        satoshis = round(satoshis, -1*round_digits)
 
     output_quantity = from_satoshis(
-            input_satoshis=satoshis_float,
+            input_satoshis=satoshis,
             output_type=output_type,
-            )
+    )
 
     if output_type == 'bit' and round_digits >= 2:
         pass
@@ -287,7 +288,7 @@ def is_valid_wallet_name(wallet_name):
 
 
 def btc_to_satoshis(btc):
-    return int(float(btc) * UNIT_MAPPINGS['btc']['satoshis_per'])
+    return int(Decimal(btc) * UNIT_MAPPINGS['btc']['satoshis_per'])
 
 
 def uses_only_hash_chars(string):