adding constants support

pyunitwizard/__init__.py

@@ -7,12 +7,15 @@
 from ._version import __version__
 
 # Add imports here
+from .constants import constants as _constants
+from .constants import constants_synonyms as _constants_synonyms
 from .main import unit, quantity, get_form, is_quantity, is_unit
 from .main import get_value, get_unit, get_value_and_unit, change_value
 from .main import convert
 from .main import get_standard_units, standardize, get_dimensionality
 from .main import concatenate, stack, hstack, vstack
 from .main import are_compatible, are_equal, are_close, check
+from .main import get_constant, show_constants
 from . import configure
 from . import kernel as _kernel
 

pyunitwizard/_version.py

@@ -1 +1 @@
-__version__ = "0.9.1+6.g394f7f0.dirty"
+__version__ = "0.9.3+0.gd41da8e.dirty"

pyunitwizard/configure/configure.py

@@ -3,6 +3,7 @@
 from pyunitwizard._private.forms import digest_form
 from pyunitwizard._private.lists_and_tuples import is_list_or_tuple
 from pyunitwizard.main import convert, get_dimensionality
+from pyunitwizard import _constants, _constants_synonyms
 import numpy as np
 from importlib.util import find_spec
 from typing import List, Dict, Union
@@ -227,3 +228,7 @@ def set_standard_units(standard_units: List[str]) -> None:
                     if candidate_array[jj]>0:
                         already[jj]=1
 
+def add_constant(constant_name, value, unit) -> None:
+
+    _constants[constant_name]=[value, unit]
+    pass

pyunitwizard/main.py

@@ -10,7 +10,6 @@
 import numpy as np
 from typing import Any, Dict, Optional, Union, Tuple
 
-
 def get_form(quantity_or_unit: QuantityOrUnit) -> str:
     """ Returns the form of a quantity as a string.
 
@@ -994,3 +993,44 @@ def vstack(sequence, to_unit=None, to_form=None, type_value='tuple', standardize
     else:
         raise ValueError
 
+def get_constant(constant_name: str,
+                to_unit:  Optional[str]=None,
+                to_form: Optional[str]=None,
+                standardized: Optional[bool]=False)-> QuantityLike:
+
+    from pyunitwizard import _constants
+    from pyunitwizard import _constants_synonyms
+
+    if constant_name in _constants_synonyms:
+        constant_name = _constants_synonyms[constant_name]
+
+    try:
+
+        value, unit = _constants[constant_name]
+        output = quantity(value, unit, form=to_form, standardized=standardized)
+        if to_unit is not None:
+            output = convert(output, to_unit=to_unit)
+
+        return output
+
+    except:
+
+        raise ValueError
+
+def show_constants()-> dict:
+
+    from pyunitwizard import _constants
+    from pyunitwizard import _constants_synonyms
+
+    output = {}
+
+    for constant_name, constant_value in _constants.items():
+        names = [constant_name]
+        value = f'{constant_value[0]} {constant_value[1]}'
+        for ii, jj in _constants_synonyms.items():
+            if jj==constant_name:
+                names.append(ii)
+        output[tuple(names)]=value
+
+    return output
+