Allow xlwt on Python 2

Use xlwt-future only on Python 3

.moban.d/travis.yml

@@ -6,6 +6,24 @@
   - pypy
 {%endblock%}
 
+{%block extra_matrix%}
+matrix:
+  include:
+    - python: 2.7
+      dist: trusty
+      sudo: required
+      virtualenv:
+        system_site_packages: true
+      addons:
+        apt:
+          packages:
+            - python-xlwt
+            - python-xlrd
+            - python-coverage
+            - python-nose
+            - python-mock
+{%endblock%}
+
 {%block custom_install %}
   - pip install https://github.com/pyexcel/pyexcel-io/archive/master.zip
   - pip install https://github.com/pyexcel/pyexcel/archive/master.zip

.travis.yml

@@ -10,6 +10,21 @@ python:
   - 3.3
   - 3.4
   - 3.5
+matrix:
+  include:
+    - python: 2.7
+      dist: trusty
+      sudo: required
+      virtualenv:
+        system_site_packages: true
+      addons:
+        apt:
+          packages:
+            - python-xlwt
+            - python-xlrd
+            - python-coverage
+            - python-nose
+            - python-mock
 before_install:
   - pip install https://github.com/pyexcel/pyexcel-io/archive/master.zip
   - pip install https://github.com/pyexcel/pyexcel/archive/master.zip

pyexcel_xls.yaml

@@ -6,5 +6,6 @@ file_type: xls
 dependencies:
   - pyexcel-io>=0.1.0
   - xlrd
-  - xlwt-future
+  - xlwt;python_version<"3"
+  - xlwt-future;python_version>="3"
 description: A wrapper library to read, manipulate and write data in xls format. It reads xlsx and xlsm format

requirements.txt

@@ -1,3 +1,4 @@
 pyexcel-io>=0.1.0
 xlrd
-xlwt-future
+xlwt;python_version<"3"
+xlwt-future;python_version>="3"

setup.py

@@ -24,10 +24,15 @@ KEYWORDS = [
 INSTALL_REQUIRES = [
     'pyexcel-io>=0.1.0',
     'xlrd',
-    'xlwt-future',
 ]
 
 EXTRAS_REQUIRE = {
+  ':python_version<"3"': [
+    'xlwt'
+  ],
+  ':python_version>="3"': [
+    'xlwt-future'
+  ],
 }
 
 CLASSIFIERS = [