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amount.py
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amount.py
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from vizbase.chains import PRECISIONS
class Amount(dict):
"""
This class helps deal and calculate with the different assets on the chain.
:param str amount_string: Amount string as used by the backend (e.g. "10 VIZ")
"""
def __init__(self, amount_string="0 VIZ"):
if isinstance(amount_string, Amount):
self["amount"] = amount_string["amount"]
self["asset"] = amount_string["asset"]
elif isinstance(amount_string, str):
self["amount"], self["asset"] = amount_string.split(" ")
else:
raise ValueError("Need an instance of 'Amount' or a string with amount and asset")
self["amount"] = float(self["amount"])
@property
def amount(self):
return self["amount"]
@property
def symbol(self):
return self["asset"]
@property # noqa: CCE001
def asset(self):
return self["asset"]
def __str__(self):
prec = PRECISIONS.get(self["asset"], 6)
return "{:.{prec}f} {}".format(self["amount"], self["asset"], prec=prec)
def __float__(self):
return self["amount"]
def __int__(self):
return int(self["amount"])
def __add__(self, other):
am = Amount(self)
if isinstance(other, Amount):
assert other["asset"] == self["asset"]
am["amount"] += other["amount"]
else:
am["amount"] += float(other)
return am
def __sub__(self, other):
am = Amount(self)
if isinstance(other, Amount):
assert other["asset"] == self["asset"]
am["amount"] -= other["amount"]
else:
am["amount"] -= float(other)
return am
def __mul__(self, other):
am = Amount(self)
if isinstance(other, Amount):
am["amount"] *= other["amount"]
else:
am["amount"] *= other
return am
def __floordiv__(self, other):
am = Amount(self)
if isinstance(other, Amount):
raise ValueError("Cannot divide two Amounts")
else:
am["amount"] //= other
return am
def __div__(self, other):
am = Amount(self)
if isinstance(other, Amount):
raise ValueError("Cannot divide two Amounts")
else:
am["amount"] /= other
return am
def __mod__(self, other):
am = Amount(self)
if isinstance(other, Amount):
am["amount"] %= other["amount"]
else:
am["amount"] %= other
return am
def __pow__(self, other):
am = Amount(self)
if isinstance(other, Amount):
am["amount"] **= other["amount"]
else:
am["amount"] **= other
return am
def __iadd__(self, other):
if isinstance(other, Amount):
assert other["asset"] == self["asset"]
self["amount"] += other["amount"]
else:
self["amount"] += other
return self
def __isub__(self, other):
if isinstance(other, Amount):
assert other["asset"] == self["asset"]
self["amount"] -= other["amount"]
else:
self["amount"] -= other
return self
def __imul__(self, other):
if isinstance(other, Amount):
self["amount"] *= other["amount"]
else:
self["amount"] *= other
return self
def __idiv__(self, other):
if isinstance(other, Amount):
assert other["asset"] == self["asset"]
return self["amount"] / other["amount"]
else:
self["amount"] /= other
return self
def __ifloordiv__(self, other):
if isinstance(other, Amount):
self["amount"] //= other["amount"]
else:
self["amount"] //= other
return self
def __imod__(self, other):
if isinstance(other, Amount):
self["amount"] %= other["amount"]
else:
self["amount"] %= other
return self
def __ipow__(self, other):
self["amount"] **= other
return self
def __lt__(self, other):
if isinstance(other, Amount):
assert other["asset"] == self["asset"]
return self["amount"] < other["amount"]
else:
return self["amount"] < float(other or 0)
def __le__(self, other):
if isinstance(other, Amount):
assert other["asset"] == self["asset"]
return self["amount"] <= other["amount"]
else:
return self["amount"] <= float(other or 0)
def __eq__(self, other):
if isinstance(other, Amount):
assert other["asset"] == self["asset"]
return self["amount"] == other["amount"]
else:
return self["amount"] == float(other or 0)
def __ne__(self, other):
if isinstance(other, Amount):
assert other["asset"] == self["asset"]
return self["amount"] != other["amount"]
else:
return self["amount"] != float(other or 0)
def __ge__(self, other):
if isinstance(other, Amount):
assert other["asset"] == self["asset"]
return self["amount"] >= other["amount"]
else:
return self["amount"] >= float(other or 0)
def __gt__(self, other): # noqa: CCE001
if isinstance(other, Amount):
assert other["asset"] == self["asset"]
return self["amount"] > other["amount"]
else:
return self["amount"] > float(other or 0)
__repr__ = __str__
__truediv__ = __div__
__truemul__ = __mul__