require Python 3.4 for asyncio

always use setuptools in setup

.travis.yml

@@ -5,15 +5,14 @@ python:
     - 3.6
     - 3.5
     - 3.4
-    - 2.7
 sudo: false
 install:
     - |
       pip install --upgrade setuptools pip
       pip install --pre .
       pip install ipykernel[test] codecov
     - |
-      if [[ "$TRAVIS_PYTHON_VERSION" == "3.6" ||  "$TRAVIS_PYTHON_VERSION" == "2.7" ]]; then
+      if [[ "$TRAVIS_PYTHON_VERSION" == "3.6" ]]; then
         pip install matplotlib
       fi
     - pip freeze

setup.py

@@ -16,13 +16,11 @@
 import sys
 
 v = sys.version_info
-if v[:2] < (2,7) or (v[0] >= 3 and v[:2] < (3,4)):
-    error = "ERROR: %s requires Python version 2.7 or 3.4 or above." % name
+if v[:2] < (3, 4):
+    error = "ERROR: %s requires Python version 3.4 or above." % name
     print(error, file=sys.stderr)
     sys.exit(1)
 
-PY3 = (sys.version_info[0] >= 3)
-
 #-----------------------------------------------------------------------------
 # get on with it
 #-----------------------------------------------------------------------------
@@ -81,12 +79,12 @@ def run(self):
     long_description="The IPython kernel for Jupyter",
     platforms="Linux, Mac OS X, Windows",
     keywords=['Interactive', 'Interpreter', 'Shell', 'Web'],
-    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*',
+    python_requires='>=3.4',
     install_requires=[
         'ipython>=4.0.0',
         'traitlets>=4.1.0',
         'jupyter_client',
-        'tornado>=4.0',
+        'tornado>=4.2',
     ],
     extras_require={
         'test:python_version=="2.7"': ['mock'],
@@ -107,6 +105,7 @@ def run(self):
     ],
 )
 
+
 if any(a.startswith(('bdist', 'build', 'install')) for a in sys.argv):
     from ipykernel.kernelspec import write_kernel_spec, make_ipkernel_cmd, KERNEL_NAME