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from ._quanta import QuantVec
from ._quanta import Quantity
from ._quanta import from_string, from_dict, from_dict_v
def is_quantity(q):
"""Indicate whether the object is a valid quantity"""
return isinstance(q, QuantVec) or isinstance(q, Quantity)
# Quantity returns new Quantities, so we need to insert these
# functions into Quantity
def new_get_value(quant, *args):
val = QuantVec._get_value(quant, *args)
if len(val) == 1:
return val[0]
else:
return val
QuantVec.get_value = new_get_value
def to_string(quant, fmt="%0.5g"):
val = quant.get_value()
if hasattr(val, "__len__"):
fmt = "[" + ", ".join([fmt % i for i in val]) + "] %s"
return fmt % quant.get_unit()
fmt += " %s"
return fmt % (val, quant.get_unit())
QuantVec.to_string = to_string
Quantity.to_string = to_string
QuantVec.__str__ = to_string
Quantity.__str__ = to_string
# QuantVec.__repr__ = to_string
# Quantity.__repr__ = to_string
def quantity(*args):
"""Create a quantity. This can be from a scalar or vector.
Example::
q1 = quantity(1.0, "km/s")
q2 = quantity("1km/s")
q1 = quantity([1.0,2.0], "km/s")
"""
if len(args) == 1:
if isinstance(args[0], str):
# use copy constructor to create quantity from string
return Quantity(from_string(args[0]))
elif isinstance(args[0], dict):
if hasattr(args[0]["value"], "__len__"):
return QuantVec(from_dict_v(args[0]))
else:
return Quantity(from_dict(args[0]))
elif isinstance(args[0], Quantity) or isinstance(args[0], QuantVec):
return args[0]
else:
raise TypeError("Invalid argument type for")
else:
if hasattr(args[0], "__len__"):
return QuantVec(*args)
else:
return Quantity(*args)
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