Show html repr of DataFrame on request

.travis.yml

@@ -13,6 +13,8 @@ addons:
     packages:
       - python3
       - python3-pip
+      - python3-setuptools
+      - libhdf5-serial-dev
 before_install:
   - pip3 install --user --upgrade pip
   - pip --version

src/Pandas.jl

@@ -313,6 +313,15 @@ function show(io::IO, df::PandasWrapped)
     println(io, s)
 end
 
+function show(io::IO, ::MIME"text/html", df::PandasWrapped)
+    obj = df.pyo
+    try
+        return println(io, obj.to_html())
+    catch
+        return show(io, df)
+    end
+end
+
 function query(df::DataFrame, s::AbstractString)
     pandas_wrap(py"$(df.pyo).query($s)"o)
 end

test/runtests.jl

@@ -8,6 +8,11 @@ age[2] = 31
 
 query(df, :(age!=27))  # Issue #26
 
+text = repr(MIME("text/html"), df)
+@test text isa String
+@test occursin("<table", text)
+@test occursin("age", text)
+
 df = read_csv(joinpath(dirname(@__FILE__), "test.csv"))
 typeof(df)
 @test isa(df, Pandas.DataFrame)