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A Python module to allow calculations using physical quantities

License: Other

Python 99.95% Batchfile 0.03% Shell 0.02%

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markus-beuckelmann vishalbelsare gamafreire standardgalactic thomaswhatt k-class haarsmam

physicalquantities's Issues

Comparisons

Comparisons like <, >, and == are not implemented.

Wrong assignment in lists and arrays

a = [1,2,3] * pq.Q(1,'m')
a[1] = a[2]
a

returns [1, 3.0 m, 3] m

Python 3 support

Does not work with Python3 and Partly Python2

1/s displayed as s/1 because of wrong division function ?

How to define a new unity.

Hello,
Your work is very useful to me. Thank you.

After reading the docs I continue to don't understand how to define more units.

Please help me to define new physical quantities.
For instance 1 L (0.001 m^3):

if I change more_units.py with
...
#Volume units
add_composite_unit('L', '0.001*m**3','Litre')
...
when in python and I call it with
from PhysicalQuantities import more_units

it gives an error:
36 add_composite_unit('L', '0.001*m**3','Litre')
NameError: name 'Litre' is not defined

I understand it, but where to define Litre?

if I instead change imperial.py, with:
...
#Volume units
add_composite_unit('L', 0.001, 'm**3', verbosename='Litre',
url='https://en.wikipedia.org/wiki/Litre')
...
Works well until the next update. However, it doesn't seem to be the right way.

thank you very much in advance
Filipe

Tab completion: show .unit and .value

Now:

In [55]: a = 1m

In [56]: a.
a.Gm        a.any_to    a.convert   a.km        a.pm        a.to
a.Mm        a.autoscale a.copy      a.m         a.sin       a.um
a.Tm        a.base      a.cos       a.mm        a.sqrt
a.am        a.cm        a.fm        a.nm        a.tan

Squaring error with prefixes

A = 100 cm**2
-> A= 10000 cm^2

but

A= 100 m**2
-> A = 100 m^2

Conversion between incompatible units should raise UnitError, not AttributeError

When trying to convert between incompatible units one would expect UnitError to be raised, instead e.g. PhysicalQuantity(1, 'm').to('kg') raises AttributeError("PhysicalUnit instance has no attribute 'unit'"). This is caused by line 453 in Unit.py, introduced by b1f54a1.

>>> PhysicalQuantity(1, 'm').to('kg')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.7/site-packages/PhysicalQuantities/Quantity.py", line 565, in to
    value = convertvalue(self.value, self.unit, unit)
  File "/usr/lib/python2.7/site-packages/PhysicalQuantities/Unit.py", line 58, in convertvalue
    (factor, offset) = src_unit.conversion_tuple_to(target_unit)
  File "/usr/lib/python2.7/site-packages/PhysicalQuantities/Unit.py", line 453, in conversion_tuple_to
    raise UnitError('Incompatible unit for conversion %s' % other.unit)
AttributeError: PhysicalUnit instance has no attribute 'unit'

@juhasch, how about just going back to raise UnitError('Incompatible units') as in e10ab54?

After update of all installed python packages (April 14) %load_ext PhysicalQuantities.ipython give an error

!uname -a
Darwin Mac132 18.7.0 Darwin Kernel Version 18.7.0: Mon Feb 10 21:08:45 PST 2020; root:xnu-4903.278.28~1/RELEASE_X86_64 x86_64
pip_freeze.txt

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-1-726c0454b5bc> in <module>
----> 1 get_ipython().run_line_magic('load_ext', 'PhysicalQuantities.ipython')
      2 import PhysicalQuantities.constants as q
      3 import PhysicalQuantities.imperial
      4 from IPython.display import display, Math, Latex
      5 from sympy import *

/Applications/SageMath/local/lib/python3.7/site-packages/IPython/core/interactiveshell.py in run_line_magic(self, magic_name, line, _stack_depth)
   2315                 kwargs['local_ns'] = sys._getframe(stack_depth).f_locals
   2316             with self.builtin_trap:
-> 2317                 result = fn(*args, **kwargs)
   2318             return result
   2319 

<decorator-gen-64> in load_ext(self, module_str)

/Applications/SageMath/local/lib/python3.7/site-packages/IPython/core/magic.py in <lambda>(f, *a, **k)
    185     # but it's overkill for just that one bit of state.
    186     def magic_deco(arg):
--> 187         call = lambda f, *a, **k: f(*a, **k)
    188 
    189         if callable(arg):

/Applications/SageMath/local/lib/python3.7/site-packages/IPython/core/magics/extension.py in load_ext(self, module_str)
     31         if not module_str:
     32             raise UsageError('Missing module name.')
---> 33         res = self.shell.extension_manager.load_extension(module_str)
     34 
     35         if res == 'already loaded':

/Applications/SageMath/local/lib/python3.7/site-packages/IPython/core/extensions.py in load_extension(self, module_str)
     85                               dir=compress_user(self.ipython_extension_dir)))
     86             mod = sys.modules[module_str]
---> 87             if self._call_load_ipython_extension(mod):
     88                 self.loaded.add(module_str)
     89             else:

/Applications/SageMath/local/lib/python3.7/site-packages/IPython/core/extensions.py in _call_load_ipython_extension(self, mod)
    132     def _call_load_ipython_extension(self, mod):
    133         if hasattr(mod, 'load_ipython_extension'):
--> 134             mod.load_ipython_extension(self.shell)
    135             return True
    136 

/Applications/SageMath/local/lib/python3.7/site-packages/PhysicalQuantities/ipython.py in load_ipython_extension(ip)
     62     global __transformer, within_comment
     63     within_comment = False
---> 64     ip.input_transformer_manager.logical_line_transforms.insert(0, __transformer)
     65     ip.user_ns['pq'] = PhysicalQuantities.q
     66 

AttributeError: 'TransformerManager' object has no attribute 'logical_line_transforms'

units with powers

a = pq.Q(1, 's**3*m**2')
leads to:
TypeError: unsupported operand type(s) for +: 'dict' and 'dict'

.to() function incorrect

a.to('1/m)' -> m/1 is displayed, although Unit should be the same

a = 1 / 1 m
b = a.to('1/m')
print a,b
print a.unit.names, b.unit.names
> 1.0 1/m 1.0 m/1
> {'m': -1} {'1': -1, 'm': 1}

Comparison not acting as expected

I don't think comparison is working.

For example, if I run the following code:

def test_comparison():
    a = pq.Q(1e-3, 'm')
    b = pq.Q(1, 'mm')
    return(a == b)
test_comparison()

I get

     False

I am using pq.version 0.2 in iPython 2.2.0.

I can get what I want by doing:

 return(a.base.value == b.base.value)

Autoscale fails on negative numbers

With PhysicalQuantities-0.9.1 in IPython, I get:

>>> (-0.00032C).autoscale
/home/foo/.local/lib/python3.6/site-packages/PhysicalQuantities/quantity.py:580: RuntimeWarning: invalid value encountered in log10
  n = np.log10(b.value)
-0.00032 C

Documentation notebook not available

Hi,
The link for the documentation notebook:
http://nbviewer.ipython.org/github/juhasch/PhysicalQuantities/blob/master/doc/Index.ipynb
is redirected to:
nbviewer.jupyter.org/github/juhasch/PhysicalQuantities/blob/master/doc/Index.ipynb
But, this page apparently does not exist (404 error).

Is there some other way to access this documentation?

Thanks,
David

pip install fails with DistributionNotFound

The package appears to be hosted on PyPi here:

https://pypi.python.org/pypi/physicalquantities/0.6.

However, attempting to install with pip fails:

pip install --user PhysicalQuantities

Full log:

------------------------------------------------------------
/usr/bin/pip run on Wed Jan 27 22:18:28 2016
Downloading/unpacking PhysicalQuantities
  Getting page https://pypi.python.org/simple/PhysicalQuantities/
  URLs to search for versions for PhysicalQuantities:
  * https://pypi.python.org/simple/PhysicalQuantities/
  Analyzing links from page https://pypi.python.org/simple/physicalquantities/
  Could not find any downloads that satisfy the requirement PhysicalQuantities
Cleaning up...
No distributions at all found for PhysicalQuantities
Exception information:
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/pip/basecommand.py", line 122, in main
    status = self.run(options, args)
  File "/usr/lib/python2.7/dist-packages/pip/commands/install.py", line 290, in run
    requirement_set.prepare_files(finder, force_root_egg_info=self.bundle, bundle=self.bundle)
  File "/usr/lib/python2.7/dist-packages/pip/req.py", line 1178, in prepare_files
    url = finder.find_requirement(req_to_install, upgrade=self.upgrade)
  File "/usr/lib/python2.7/dist-packages/pip/index.py", line 277, in find_requirement
    raise DistributionNotFound('No distributions at all found for %s' % req)
DistributionNotFound: No distributions at all found for PhysicalQuantities

Conversion from string

Thanks for the cool library!
It would be nice to have a function that can parse a PhysicalQuantity from a string.

For usage outside ipython, it would be nice if this was available under a short name, such as the already existing q().

A quick mock-up which just splits at whitespace:

from PhysicalQuantities import PhysicalQuantity, _Quantity, q
_Quantity.__call__ = lambda s, x: PhysicalQuantity(float(x.split()[0]), x.split()[1])
print(q("1 m") / q("1 s"))  # gives 1.0 m/s

It would also be useful for parsing string data loaded from files or input by user.

2 m2 gets expanded to 4 m2

2 m**2 gets expanded to 4 m^2 instead of 2 m^2

Doesn't work on Python 3.9.1

Hi! I am using Python 3.9.1 with Spyder 4.2.1 and command %load_ext PhysicalQuantities.ipython in Spyder console gives the following problem

What should/can I do to solve it? (other tryings with different commands gave me no positive result)
Thanks!

TypeError in ^3

xQ = np.array([1, 3, 0]) * 1 m
xq = np.array([3, 2, 0]) * 1 m
ra=np.linalg.norm(xQ-xq)
ra**3

TypeError: unsupported operand type(s) for *: 'int' and 'dict'

Bohr unit still using pi as a unit

The line below throws out an error because it's trying to use pi as a unit, and it is not using np.pi as you've changed others to.

 addunit('Bohr', '4*pi*eps0*hbar**2/me/e0**2', 'Bohr radius')

Error:

 NameError: name 'pi' is not defined

Also, it looks like hartree is the the same.

dB units do not work with pymarkdown in notebook

a=0 m
b = 0 dB

Result:
a = 0 m ; b =

>>> 8.85e-12F/1m
8.85e-12 F*m

Squaring error with prefixes

Still not solved:
2 m2 -> 2 m^2
2 mm2 -> 4 mm^2

Get real/imag part of complex number

Make it easier to get real/imag part of a complex number with unit:

a = (1 + 1j) * 1 Ohm
a.real

Overriding numpy ufuncs

Seems overriding np.sqrt creates problems with numba.

dB() outdated

use dBQuantity(10*np.log10(3),'dB',islog=True) instead of dBUnit(10*np.log10(x),'dB',islog=True)