From eabb46b9e78fbd3a659274aaeac6c4ccd275768a Mon Sep 17 00:00:00 2001
From: Ray Speth <speth@mit.edu>
Date: Thu, 6 Sep 2012 19:55:40 +0000
Subject: [PATCH] Added physical constants to the new Python module

---
 interfaces/cython/cantera/__init__.py   |  1 +
 interfaces/cython/cantera/constants.pyx | 49 +++++++++++++++++++++++++
 interfaces/cython/setup.py.in           |  1 +
 3 files changed, 51 insertions(+)
 create mode 100644 interfaces/cython/cantera/constants.pyx

diff --git a/interfaces/cython/cantera/__init__.py b/interfaces/cython/cantera/__init__.py
index 7a493060d..aeb237c7f 100644
--- a/interfaces/cython/cantera/__init__.py
+++ b/interfaces/cython/cantera/__init__.py
@@ -1 +1,2 @@
 from .solution import *
+from .constants import *
diff --git a/interfaces/cython/cantera/constants.pyx b/interfaces/cython/cantera/constants.pyx
new file mode 100644
index 000000000..6fcde141e
--- /dev/null
+++ b/interfaces/cython/cantera/constants.pyx
@@ -0,0 +1,49 @@
+cdef extern from "cantera/base/ct_defs.h" namespace "Cantera":
+    cdef double CxxAvogadro "Cantera::Avogadro"
+    cdef double CxxGasConstant "Cantera::GasConstant"
+    cdef double CxxOneAtm "Cantera::OneAtm"
+    cdef double CxxBoltzmann "Cantera::Boltzmann"
+    cdef double CxxPlanck "Cantera::Planck"
+    cdef double CxxStefanBoltz "Cantera::StefanBoltz"
+    cdef double CxxFaraday "Cantera::Faraday"
+    cdef double CxxElectronCharge "Cantera::ElectronCharge"
+    cdef double CxxElectronMass "Cantera::ElectronMass"
+    cdef double CxxLightSpeed "Cantera::lightSpeed"
+    cdef double CxxPermeability_0 "Cantera::permeability_0"
+    cdef double CxxEpsilon_0 "Cantera::epsilon_0"
+
+#: Avogadro's Number, /kmol
+Avogadro = CxxAvogadro
+
+#: The ideal gas constant in J/kmo-K
+GasConstant = CxxGasConstant
+
+#: One atmosphere in Pascals
+OneAtm = CxxOneAtm
+
+#: Boltzmann constant
+Boltzmann = CxxBoltzmann
+
+#: Planck constant (J/s)
+Planck = CxxPlanck
+
+#: The Stefan-Boltzmann constant, W/m^2K^4
+StefanBoltz = CxxStefanBoltz
+
+#: The charge on an electron (C)
+ElectronCharge = CxxElectronCharge
+
+#: The mass of an electron (kg)
+ElectronMass = CxxElectronMass
+
+#: Faraday constant, C/kmol
+Faraday = CxxFaraday
+
+#: Speed of Light (m/s).
+lightSpeed = CxxLightSpeed
+
+#: Permeability of free space :math:`\mu_0` in N/A^2.
+permeability_0 = CxxPermeability_0
+
+#: Permittivity of free space (Farads/m = C^2/N/m^2)
+epsilon_0 = CxxEpsilon_0
diff --git a/interfaces/cython/setup.py.in b/interfaces/cython/setup.py.in
index 668bb21e0..15c843c8b 100644
--- a/interfaces/cython/setup.py.in
+++ b/interfaces/cython/setup.py.in
@@ -22,6 +22,7 @@ def addExtension(name):
 
 addExtension('solution')
 addExtension('utils')
+addExtension('constants')
 
 setup(name="Cantera",
       version="@cantera_version@",