diff --git a/src/sage/coding/all.py b/src/sage/coding/all.py
index 89778395ff3..e5ff88308b7 100644
--- a/src/sage/coding/all.py
+++ b/src/sage/coding/all.py
@@ -2,7 +2,7 @@
 from sage.misc.lazy_import import lazy_import as _lazy_import
 
 _lazy_import("sage.coding.code_constructions", ["permutation_action",
-            "walsh_matrix"])
+                                                "walsh_matrix"])
 
 _lazy_import("sage.coding.linear_code", "LinearCode")
 
diff --git a/src/sage/coding/source_coding/huffman.py b/src/sage/coding/source_coding/huffman.py
index eb138738f2f..6c08a4d885a 100644
--- a/src/sage/coding/source_coding/huffman.py
+++ b/src/sage/coding/source_coding/huffman.py
@@ -32,6 +32,7 @@
 
 from sage.structure.sage_object import SageObject
 
+
 ###########################################################################
 #
 # Helper functions
diff --git a/src/sage/crypto/sbox.pyx b/src/sage/crypto/sbox.pyx
index dfd3bd58a22..b72f13e30a8 100644
--- a/src/sage/crypto/sbox.pyx
+++ b/src/sage/crypto/sbox.pyx
@@ -649,7 +649,7 @@ cdef class SBox(SageObject):
         TESTS::
 
         Testing square SBoxes::
-        
+
             sage: from sage.crypto.sbox import SBox
             sage: S = SBox(7,6,0,4,2,5,1,3)
             sage: S.difference_distribution_table()