diff --git a/setup.py b/setup.py
index 237e83a..85399d4 100755
--- a/setup.py
+++ b/setup.py
@@ -4,6 +4,7 @@
 from glob import glob
 from setuptools import setup, Extension
 from setuptools.command.bdist_egg import bdist_egg as _bdist_egg
+from subprocess import Popen, PIPE
 
 kernelpath = os.path.join("share", "jupyter", "kernels", "pari_jupyter")
 nbextpath = os.path.join("share", "jupyter", "nbextensions", "gp-mode")
@@ -20,18 +21,17 @@
     ext = ".pyx"
     cmdclass = dict(build_ext=build_ext)
 
-extensions = [Extension("PARIKernel.kernel", ["PARIKernel/kernel"+ext], libraries=["pari", "readline"]),
-              Extension("PARIKernel.io", ["PARIKernel/io"+ext], libraries=["pari"])]
+extensions = [Extension("PARIKernel.kernel", ["PARIKernel/kernel" + ext], libraries=["pari", "readline"]),
+              Extension("PARIKernel.io", ["PARIKernel/io" + ext], libraries=["pari"])]
 
 
 # Are SVG graphics available?
-from subprocess import Popen, PIPE
 gp = Popen("gp -f -q", shell=True, stdin=PIPE, stdout=PIPE, stderr=PIPE)
 gp.communicate(b'''iferr(install(pari_set_plot_engine, "vL"), E, quit(1));''')
 HAVE_SVG = (gp.wait() == 0)
 
 if HAVE_SVG:
-    ext = Extension("PARIKernel.svg", ["PARIKernel/svg"+ext], libraries=["pari"])
+    ext = Extension("PARIKernel.svg", ["PARIKernel/svg" + ext], libraries=["pari"])
     extensions.append(ext)
 
 
@@ -40,6 +40,7 @@ def run(self):
         from distutils.errors import DistutilsOptionError
         raise DistutilsOptionError("The package pari-jupyter will not function correctly when built as egg. Therefore, it cannot be installed using 'python setup.py install' or 'easy_install'. Instead, use 'pip install' to install this package.")
 
+
 cmdclass['bdist_egg'] = no_egg
 
 
@@ -49,6 +50,6 @@ def run(self):
     data_files=[(kernelpath, glob("spec/*")),
                 (nbextpath, glob("gp-mode/*")),
                 (nbconfpath, ["gp-mode.json"]),
-    ],
+                ],
     cmdclass=cmdclass,
 )
diff --git a/test/test_pari_jupyter_kernel.py b/test/test_pari_jupyter_kernel.py
index efb38f0..c011715 100644
--- a/test/test_pari_jupyter_kernel.py
+++ b/test/test_pari_jupyter_kernel.py
@@ -6,6 +6,7 @@
 import unittest
 import jupyter_kernel_test as jkt
 
+
 class PARIKernelTests(jkt.KernelTests):
 
     # REQUIRED
@@ -98,5 +99,6 @@ class PARIKernelTests(jkt.KernelTests):
     # the client
     # code_clear_output = "from IPython.display import clear_output; clear_output()"
 
+
 if __name__ == '__main__':
     unittest.main(verbosity=2)