close #328; issue with E and lamdify (#329)

* lambdify with E, close issue #328

* add test, bump version

Author: jverzani

Project.toml

@@ -1,6 +1,6 @@
 name = "SymPy"
 uuid = "24249f21-da20-56a4-8eb1-6a02cf4ae2e6"
-version = "1.0.14"
+version = "1.0.15"
 
 [deps]
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"

grep

@@ -9,7 +9,7 @@ val_map = Dict(
                "NegativeOne"      => :(-1),
                "Half"             => :(1/2),
                "Pi"               => :pi,
-               "Exp1"             => :e,
+               "Exp1"             => :ℯ,
                "Infinity"         => :Inf,
                "NegativeInfinity" => :(-Inf),
                "ComplexInfinity"  => :Inf, # error?

src/lambdify.jl

@@ -591,6 +591,12 @@ end
     @test eltype(A*ones(2,2)) == Sym
     @test eltype(A*Diagonal([1,1])) == Sym
     @test_broken eltype(A * I(2)) == Sym
+
+    ## Issue 328 with E -> e
+    @vars x
+    ex = 3 * sympy.E * x
+    fn = lambdify(ex)
+    @test fn(1) ≈ 3*exp(1) * 1
 end
 
 @testset "generic programming, issue 223" begin