diff --git a/_doc/conf.py b/_doc/conf.py
index 07e1c53..a8d6dc0 100644
--- a/_doc/conf.py
+++ b/_doc/conf.py
@@ -4,7 +4,6 @@
 from sphinx_runpython.conf_helper import has_dvipng, has_dvisvgm
 from pandas_streaming import __version__
 
-
 extensions = [
     "nbsphinx",
     "sphinx.ext.autodoc",
diff --git a/_doc/examples/first_step.py b/_doc/examples/first_step.py
index b0b80b7..5d0ce50 100644
--- a/_doc/examples/first_step.py
+++ b/_doc/examples/first_step.py
@@ -12,7 +12,6 @@
 from pandas import DataFrame
 from pandas_streaming.df import StreamingDataFrame
 
-
 df = DataFrame(data=dict(X=[4.5, 6, 7], Y=["a", "b", "c"]))
 df