Evaluate expression

[ortega2247]

Use parameter and expression values (when the expression is constant) to calculate the value of a defined expression.

[codecov-io]

Codecov Report

Merging #457 into master will increase coverage by 0.03%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #457      +/-   ##
==========================================
+ Coverage   79.35%   79.39%   +0.03%     
==========================================
  Files          96       96              
  Lines        9644     9656      +12     
==========================================
+ Hits         7653     7666      +13     
+ Misses       1991     1990       -1

Impacted Files	Coverage Δ
pysb/core.py	88.31% <100%> (+0.16%)	⬆️
pysb/tests/test_core.py	95.19% <100%> (+0.09%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update b909661...9eba806. Read the comment docs.