clean up and add web3

web3_python_toolkit/scripts/utils/arithmetics.py

@@ -0,0 +1,25 @@
+# -*- encoding: utf-8 -*-
+# arithmetics.py
+# This class implements math methods used by the other classes.
+# author: steinkirch
+
+
+from decimal import Decimal, getcontext
+from utils.strings import log_error
+
+
+def div(dividend, divisor) -> Decimal:
+    """Return higher precision division."""
+
+    if divisor == 0:
+        log_error('Found a zero division error. Returning 0.')
+        return 0
+    return to_decimal(dividend) / to_decimal(divisor)
+
+
+def to_decimal(value, precision=None) -> Decimal:
+    """Return Decimal value for higher (defined) precision."""
+
+    precision = precision or 22
+    getcontext().prec = precision
+    return Decimal(value)