diff --git a/IPython/nbconvert/writers/__init__.py b/IPython/nbconvert/writers/__init__.py
index 155cf89..2b678f2 100644
--- a/IPython/nbconvert/writers/__init__.py
+++ b/IPython/nbconvert/writers/__init__.py
@@ -1,3 +1,3 @@
 from .files import FilesWriter
 from .stdout import StdoutWriter
-from .pdf import PDFWriter
+from .base import WriterBase
diff --git a/IPython/nbconvert/writers/debug.py b/IPython/nbconvert/writers/debug.py
index 7989a23..51d524d 100644
--- a/IPython/nbconvert/writers/debug.py
+++ b/IPython/nbconvert/writers/debug.py
@@ -1,4 +1,3 @@
-#!/usr/bin/env python
 """
 Contains debug writer.
 """
diff --git a/IPython/nbconvert/writers/files.py b/IPython/nbconvert/writers/files.py
index fda1e99..203f460 100644
--- a/IPython/nbconvert/writers/files.py
+++ b/IPython/nbconvert/writers/files.py
@@ -1,4 +1,3 @@
-#!/usr/bin/env python
 """
 Contains writer for writing nbconvert output to filesystem.
 """
diff --git a/IPython/nbconvert/writers/stdout.py b/IPython/nbconvert/writers/stdout.py
index 4dd2bb4..d91fcee 100644
--- a/IPython/nbconvert/writers/stdout.py
+++ b/IPython/nbconvert/writers/stdout.py
@@ -1,4 +1,3 @@
-#!/usr/bin/env python
 """
 Contains Stdout writer
 """