Wrap Precise into FtPecise

freqtrade/exchange/exchange.py

@@ -16,7 +16,7 @@ import arrow
 import ccxt
 import ccxt.async_support as ccxt_async
 from cachetools import TTLCache
-from ccxt import ROUND_DOWN, ROUND_UP, TICK_SIZE, TRUNCATE, Precise, decimal_to_precision
+from ccxt import ROUND_DOWN, ROUND_UP, TICK_SIZE, TRUNCATE, decimal_to_precision
 from pandas import DataFrame
 
 from freqtrade.constants import (DEFAULT_AMOUNT_RESERVE_PERCENT, NON_OPEN_EXCHANGE_STATES, BuySell,
@@ -32,6 +32,7 @@ from freqtrade.exchange.common import (API_FETCH_ORDER_RETRY_COUNT, BAD_EXCHANGE
                                        retrier_async)
 from freqtrade.misc import chunks, deep_merge_dicts, safe_value_fallback2
 from freqtrade.plugins.pairlist.pairlist_helpers import expand_pairlist
+from freqtrade.util import FtPrecise
 
 
 CcxtModuleType = Any
@@ -708,10 +709,10 @@ class Exchange:
             #                                    counting_mode=self.precisionMode,
             #                                    ))
             if self.precisionMode == TICK_SIZE:
-                precision = Precise(str(self.markets[pair]['precision']['price']))
+                precision = FtPrecise(str(self.markets[pair]['precision']['price']))
-                price_str = Precise(str(price))
+                price_str = FtPrecise(str(price))
                 missing = price_str % precision
-                if not missing == Precise("0"):
+                if not missing == FtPrecise("0"):
                     price = round(float(str(price_str - missing + precision)), 14)
             else:
                 symbol_prec = self.markets[pair]['precision']['price']

freqtrade/util/__init__.py

@@ -1,2 +1,3 @@
 # flake8: noqa: F401
+from freqtrade.util.ft_precise import FtPrecise
 from freqtrade.util.periodic_cache import PeriodicCache

freqtrade/util/ft_precise.py

@@ -0,0 +1,9 @@
+"""
+Slim wrapper around ccxt's Precise (string math)
+To have imports from freqtrade
+"""
+from ccxt import Precise
+
+
+class FtPrecise(Precise):
+    pass

tests/exchange/test_ccxt_precise.py

@@ -1,14 +1,14 @@
-from ccxt import Precise
+from freqtrade.util import FtPrecise
 
 
-ws = Precise('-1.123e-6')
+ws = FtPrecise('-1.123e-6')
-ws = Precise('-1.123e-6')
+ws = FtPrecise('-1.123e-6')
-xs = Precise('0.00000002')
+xs = FtPrecise('0.00000002')
-ys = Precise('69696900000')
+ys = FtPrecise('69696900000')
-zs = Precise('0')
+zs = FtPrecise('0')
 
 
-def test_precise():
+def test_FtPrecise():
     assert ys * xs == '1393.938'
     assert xs * ys == '1393.938'
 
@@ -45,31 +45,31 @@ def test_precise():
     assert xs + zs == '0.00000002'
     assert ys + zs == '69696900000'
 
-    assert abs(Precise('-500.1')) == '500.1'
+    assert abs(FtPrecise('-500.1')) == '500.1'
-    assert abs(Precise('213')) == '213'
+    assert abs(FtPrecise('213')) == '213'
 
-    assert abs(Precise('-500.1')) == '500.1'
+    assert abs(FtPrecise('-500.1')) == '500.1'
-    assert -Precise('213') == '-213'
+    assert -FtPrecise('213') == '-213'
 
-    assert Precise('10.1') % Precise('0.5') == '0.1'
+    assert FtPrecise('10.1') % FtPrecise('0.5') == '0.1'
-    assert Precise('5550') % Precise('120') == '30'
+    assert FtPrecise('5550') % FtPrecise('120') == '30'
 
-    assert Precise('-0.0') == Precise('0')
+    assert FtPrecise('-0.0') == FtPrecise('0')
-    assert Precise('5.534000') == Precise('5.5340')
+    assert FtPrecise('5.534000') == FtPrecise('5.5340')
 
-    assert min(Precise('-3.1415'), Precise('-2')) == '-3.1415'
+    assert min(FtPrecise('-3.1415'), FtPrecise('-2')) == '-3.1415'
 
-    assert max(Precise('3.1415'), Precise('-2')) == '3.1415'
+    assert max(FtPrecise('3.1415'), FtPrecise('-2')) == '3.1415'
 
-    assert Precise('2') > Precise('1.2345')
+    assert FtPrecise('2') > FtPrecise('1.2345')
-    assert not Precise('-3.1415') > Precise('-2')
+    assert not FtPrecise('-3.1415') > FtPrecise('-2')
-    assert not Precise('3.1415') > Precise('3.1415')
+    assert not FtPrecise('3.1415') > FtPrecise('3.1415')
-    assert Precise.string_gt('3.14150000000000000000001', '3.1415')
+    assert FtPrecise.string_gt('3.14150000000000000000001', '3.1415')
 
-    assert Precise('3.1415') >= Precise('3.1415')
+    assert FtPrecise('3.1415') >= FtPrecise('3.1415')
-    assert Precise('3.14150000000000000000001') >= Precise('3.1415')
+    assert FtPrecise('3.14150000000000000000001') >= FtPrecise('3.1415')
 
-    assert not Precise('3.1415') < Precise('3.1415')
+    assert not FtPrecise('3.1415') < FtPrecise('3.1415')
 
-    assert Precise('3.1415') <= Precise('3.1415')
+    assert FtPrecise('3.1415') <= FtPrecise('3.1415')
-    assert Precise('3.1415') <= Precise('3.14150000000000000000001')
+    assert FtPrecise('3.1415') <= FtPrecise('3.14150000000000000000001')