Measurement Objects

objects may be instantiated using a keyword argument indicating the context of the units. In the example below, two different distance objects are instantiated in units of kilometers (km) and miles (mi):

For conversions, access the preferred unit attribute to get a converted distance quantity:

>>> print(d1.mi) # Converting 5 kilometers to miles
3.10685596119
>>> print(d2.km) # Converting 5 miles to kilometers

Moreover, arithmetic operations may be performed between the distance objects:

>>> print(d1 + d2) # Adding 5 miles to 5 kilometers
13.04672 km
>>> print(d2 - d1) # Subtracting 5 kilometers from 5 miles
1.89314403881 mi

Two Distance objects multiplied together will yield an object, which uses squared units of measure:

To determine what the attribute abbreviation of a unit is, the unit_attname class method may be used:

>>> print(Distance.unit_attname('US Survey Foot'))
survey_ft
>>> print(Distance.unit_attname('centimeter'))
cm

注解

class Distance(\*kwargs*)[源代码]

To initialize a distance object, pass in a keyword corresponding to the desired set with desired value. For example, the following creates a distance object representing 5 miles:

• __getattr__(unit_att)

Returns the distance value in units corresponding to the given unit attribute. For example:

• classmethod unit_attname(unit_name)

Returns the distance unit attribute name for the given full unit name. For example:

>>> Distance.unit_attname('Mile')
'mi'

class D

Alias for Distance class.

Area

To initialize an area object, pass in a keyword corresponding to the desired set with desired value. For example, the following creates an area object representing 5 square miles:

>>> a = Area(sq_mi=5)

• __getattr__(unit_att)

Returns the area value in units corresponding to the given unit attribute. For example:

• classmethod unit_attname(unit_name)

Returns the area unit attribute name for the given full unit name. For example:

>>> Area.unit_attname('Kilometer')

class

Alias for Area class.

脚注