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prefix_conversions.py
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"""
Convert International System of Units (SI) and Binary prefixes
"""
from __future__ importannotations
fromenumimportEnum
classSIUnit(Enum):
yotta=24
zetta=21
exa=18
peta=15
tera=12
giga=9
mega=6
kilo=3
hecto=2
deca=1
deci=-1
centi=-2
milli=-3
micro=-6
nano=-9
pico=-12
femto=-15
atto=-18
zepto=-21
yocto=-24
classBinaryUnit(Enum):
yotta=8
zetta=7
exa=6
peta=5
tera=4
giga=3
mega=2
kilo=1
defconvert_si_prefix(
known_amount: float,
known_prefix: str|SIUnit,
unknown_prefix: str|SIUnit,
) ->float:
"""
Wikipedia reference: https://en.wikipedia.org/wiki/Binary_prefix
Wikipedia reference: https://en.wikipedia.org/wiki/International_System_of_Units
>>> convert_si_prefix(1, SIUnit.giga, SIUnit.mega)
1000
>>> convert_si_prefix(1, SIUnit.mega, SIUnit.giga)
0.001
>>> convert_si_prefix(1, SIUnit.kilo, SIUnit.kilo)
1
>>> convert_si_prefix(1, 'giga', 'mega')
1000
>>> convert_si_prefix(1, 'gIGa', 'mEGa')
1000
"""
ifisinstance(known_prefix, str):
known_prefix=SIUnit[known_prefix.lower()]
ifisinstance(unknown_prefix, str):
unknown_prefix=SIUnit[unknown_prefix.lower()]
unknown_amount: float=known_amount* (
10** (known_prefix.value-unknown_prefix.value)
)
returnunknown_amount
defconvert_binary_prefix(
known_amount: float,
known_prefix: str|BinaryUnit,
unknown_prefix: str|BinaryUnit,
) ->float:
"""
Wikipedia reference: https://en.wikipedia.org/wiki/Metric_prefix
>>> convert_binary_prefix(1, BinaryUnit.giga, BinaryUnit.mega)
1024
>>> convert_binary_prefix(1, BinaryUnit.mega, BinaryUnit.giga)
0.0009765625
>>> convert_binary_prefix(1, BinaryUnit.kilo, BinaryUnit.kilo)
1
>>> convert_binary_prefix(1, 'giga', 'mega')
1024
>>> convert_binary_prefix(1, 'gIGa', 'mEGa')
1024
"""
ifisinstance(known_prefix, str):
known_prefix=BinaryUnit[known_prefix.lower()]
ifisinstance(unknown_prefix, str):
unknown_prefix=BinaryUnit[unknown_prefix.lower()]
unknown_amount: float=known_amount* (
2** ((known_prefix.value-unknown_prefix.value) *10)
)
returnunknown_amount
if__name__=="__main__":
importdoctest
doctest.testmod()
