Return list of physical_constant keys containing a given string.
sub : str, unicode
Sub-string to search keys for. By default, return all keys.
disp : bool
If True, print the keys that are found, and return None. Otherwise, return the list of keys without printing anything.
keys : list or None
If disp is False, the list of keys is returned. Otherwise, None is returned.
- Contains the description of
physical_constants, which, as a dictionary literal object, does not itself possess a docstring.
>>> from scipy.constants import find, physical_constants
Which keys in the
physical_constantsdictionary contain ‘boltzmann’?
>>> find('boltzmann') ['Boltzmann constant', 'Boltzmann constant in Hz/K', 'Boltzmann constant in eV/K', 'Boltzmann constant in inverse meters per kelvin', 'Stefan-Boltzmann constant']
Get the constant called ‘Boltzmann constant in Hz/K’:
>>> physical_constants['Boltzmann constant in Hz/K'] (20836612000.0, 'Hz K^-1', 12000.0)
Find constants with ‘radius’ in the key:
>>> find('radius') ['Bohr radius', 'classical electron radius', 'deuteron rms charge radius', 'proton rms charge radius'] >>> physical_constants['classical electron radius'] (2.8179403227e-15, 'm', 1.9e-24)