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Python/conversions/prefix_conversions.py at Write-for-current-Python · davgit/Python · GitHub
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Python
/
conversions
/
prefix_conversions.py
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Python
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conversions
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prefix_conversions.py
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"""
Convert International System of Units (SI) and Binary prefixes
"""
from
enum
import
Enum
from
typing
import
Union
class
SI_Unit
(
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
class
Binary_Unit
(
Enum
):
yotta
=
8
zetta
=
7
exa
=
6
peta
=
5
tera
=
4
giga
=
3
mega
=
2
kilo
=
1
def
convert_si_prefix
(
known_amount
:
float
,
known_prefix
:
Union
[
str
,
SI_Unit
],
unknown_prefix
:
Union
[
str
,
SI_Unit
],
)
->
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, SI_Unit.giga, SI_Unit.mega)
1000
>>> convert_si_prefix(1, SI_Unit.mega, SI_Unit.giga)
0.001
>>> convert_si_prefix(1, SI_Unit.kilo, SI_Unit.kilo)
1
>>> convert_si_prefix(1, 'giga', 'mega')
1000
>>> convert_si_prefix(1, 'gIGa', 'mEGa')
1000
"""
if
isinstance
(
known_prefix
,
str
):
known_prefix
=
SI_Unit
[
known_prefix
.
lower
()]
if
isinstance
(
unknown_prefix
,
str
):
unknown_prefix
=
SI_Unit
[
unknown_prefix
.
lower
()]
unknown_amount
:
float
=
known_amount
*
(
10
**
(
known_prefix
.
value
-
unknown_prefix
.
value
)
)
return
unknown_amount
def
convert_binary_prefix
(
known_amount
:
float
,
known_prefix
:
Union
[
str
,
Binary_Unit
],
unknown_prefix
:
Union
[
str
,
Binary_Unit
],
)
->
float
:
"""
Wikipedia reference: https://en.wikipedia.org/wiki/Metric_prefix
>>> convert_binary_prefix(1, Binary_Unit.giga, Binary_Unit.mega)
1024
>>> convert_binary_prefix(1, Binary_Unit.mega, Binary_Unit.giga)
0.0009765625
>>> convert_binary_prefix(1, Binary_Unit.kilo, Binary_Unit.kilo)
1
>>> convert_binary_prefix(1, 'giga', 'mega')
1024
>>> convert_binary_prefix(1, 'gIGa', 'mEGa')
1024
"""
if
isinstance
(
known_prefix
,
str
):
known_prefix
=
Binary_Unit
[
known_prefix
.
lower
()]
if
isinstance
(
unknown_prefix
,
str
):
unknown_prefix
=
Binary_Unit
[
unknown_prefix
.
lower
()]
unknown_amount
:
float
=
known_amount
*
(
2
**
((
known_prefix
.
value
-
unknown_prefix
.
value
)
*
10
)
)
return
unknown_amount
if
__name__
==
"__main__"
:
import
doctest
doctest
.
testmod
()
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