diff --git a/Chapter_1/ETAOIN_practice.py b/Chapter_1/ETAOIN_practice.py
index 90e1444..eee08f7 100644
--- a/Chapter_1/ETAOIN_practice.py
+++ b/Chapter_1/ETAOIN_practice.py
@@ -4,10 +4,10 @@
 from collections import defaultdict
 
 # Note: text should be a short phrase for bars to fit in IDLE window
-text = 'Like the castle in its corner in a medieval game, I foresee terrible \
-trouble and I stay here just the same.'
+text = "Like the castle in its corner in a medieval game, I foresee terrible \
+trouble and I stay here just the same."
 
-ALPHABET = 'abcdefghijklmnopqrstuvwxyz'
+ALPHABET = "abcdefghijklmnopqrstuvwxyz"
 
 # defaultdict module lets you build dictionary keys on the fly!
 mapped = defaultdict(list)
@@ -18,6 +18,6 @@
 
 # pprint lets you print stacked output
 print("\nYou may need to stretch console window if text wrapping occurs.\n")
-print("text = ", end='')
+print("text = ", end="")
 print("{}\n".format(text), file=sys.stderr)
 pprint.pprint(mapped, width=110)