Fix issue #63 - incorrect results with python format e

Author: ScottPJones

src/fmtcore.jl

@@ -264,14 +264,14 @@ function _pfmt_e(out::IO, fs::FormatSpec, x::AbstractFloat)
     else
         rax = round(ax; sigdigits = fs.prec + 1)
         e = floor(Integer, log10(rax))  # exponent
-        u = rax * exp10(-e)  # significand
+        u = round(rax * exp10(-e); sigdigits = fs.prec + 1)  # significand
         i = 0
         v10 = 1
         while isinf(u)
             i += 1
             i > 18 && (u = 0.0; e = 0; break)
             v10 *= 10
-            u = v10 * rax * exp10(-e - i)
+            u = round(v10 * rax * exp10(-e - i); sigdigits = fs.prec + 1)
         end
     end
 

test/fmtspec.jl

@@ -150,7 +150,7 @@ end
     # Issue #110 (in Formatting.jl)
     f = FormatExpr("{:+d}")
     for T in (Int8, Int16, Int32, Int64, Int128)
-        @test format(f, typemin(T)) = string(typemin(T))
+        @test format(f, typemin(T)) == string(typemin(T))
     end
 end
 
@@ -257,6 +257,9 @@ end
     @test pyfmt("+11.3e", 1.0e-309) == "+1.000e-309"
     @test pyfmt("+11.3e", 1.0e-313) == "+1.000e-313"
 
+    # issue #108 (from Formatting.jl)
+    @test pyfmt(".1e", 0.0003) == "3.0e-04"
+    @test pyfmt(".1e", 0.0006) == "6.0e-04"
 end
 
 @testset "Format special floating point value" begin
@@ -279,6 +282,7 @@ end
     @test pyfmt("<5f", Inf) == "Inf  "
     @test pyfmt("^5f", Inf) == " Inf "
     @test pyfmt(">5f", Inf) == "  Inf"
+
     @test pyfmt("*<5f", Inf) == "Inf**"
     @test pyfmt("⋆<5f", Inf) == "Inf⋆⋆"
     @test pyfmt("*^5f", Inf) == "*Inf*"