Depreciate support for Python 2.6

follow suit of Crypto and py core team: pyca/cryptography@0857894

Author: chriddyp

circle.yml

@@ -2,10 +2,9 @@ machine:
   environment:
     PLOTLY_PACKAGE_ROOT: /home/ubuntu/python-api
     PLOTLY_CONFIG_DIR: ${HOME}/.plotly
-    PLOTLY_PYTHON_VERSIONS: 2.6.8 2.7.8 3.3.3 3.4.1
+    PLOTLY_PYTHON_VERSIONS: 2.7.8 3.3.3 3.4.1
     PLOTLY_CORE_REQUIREMENTS_FILE: ${PLOTLY_PACKAGE_ROOT}/requirements.txt
     PLOTLY_OPTIONAL_REQUIREMENTS_FILE: ${PLOTLY_PACKAGE_ROOT}/optional-requirements.txt
-    PLOTLY_OPTIONAL_REQUIREMENTS_FILE_2_6: ${PLOTLY_PACKAGE_ROOT}/optional-requirements-2-6.txt
 dependencies:
   override:
 

circle/setup.sh

@@ -33,17 +33,8 @@ for version in ${PLOTLY_PYTHON_VERSIONS[@]}; do
     pip install -r ${PLOTLY_CORE_REQUIREMENTS_FILE} ||
         error_exit "${LINENO}: can't install core reqs for Python ${version}"
 
-    # handle funkiness around python 2.6
-    if [ ${version:0:3} == '2.6' ]
-    then
-        pip install -e '.[PY2.6]' ||
-            error_exit "${LINENO}: can't install extras for Python ${version}"
-        pip install -r ${PLOTLY_OPTIONAL_REQUIREMENTS_FILE_2_6} ||
-            error_exit "${LINENO}: can't install optional for Python ${version}"
-    else
-        pip install -r ${PLOTLY_OPTIONAL_REQUIREMENTS_FILE} ||
-            error_exit "${LINENO}: can't install optional for Python ${version}"
-    fi
+    pip install -r ${PLOTLY_OPTIONAL_REQUIREMENTS_FILE} ||
+        error_exit "${LINENO}: can't install optional for Python ${version}"
 
     # install some test tools
     pip install nose coverage ||