diff --git a/ciphers/a1z26.py b/ciphers/a1z26.py
index 3684c8cb3..92710ec44 100644
--- a/ciphers/a1z26.py
+++ b/ciphers/a1z26.py
@@ -6,6 +6,7 @@ https://www.dcode.fr/letter-number-cipher
 http://bestcodes.weebly.com/a1z26.html
 """
 
+
 def encode(plain: str) -> list:
     """
     >>> encode("myname")
@@ -13,6 +14,7 @@ def encode(plain: str) -> list:
     """
     return [ord(elem) - 96 for elem in plain]
 
+
 def decode(encoded: list) -> str:
     """
     >>> decode([13, 25, 14, 1, 13, 5])
@@ -20,10 +22,12 @@ def decode(encoded: list) -> str:
     """
     return "".join(chr(elem + 96) for elem in encoded)
 
+
 def main():
     encoded = encode(input("->").strip().lower())
     print("Encoded: ", encoded)
     print("Decoded:", decode(encoded))
 
+
 if __name__ == "__main__":
     main()
diff --git a/data_structures/binary_tree/binary_search_tree.py b/data_structures/binary_tree/binary_search_tree.py
index 405468752..386813035 100644
--- a/data_structures/binary_tree/binary_search_tree.py
+++ b/data_structures/binary_tree/binary_search_tree.py
@@ -153,7 +153,7 @@ def postorder(curr_node):
 
 
 def binary_search_tree():
-    """
+    r"""
     Example
                   8
                  / \
diff --git a/digital_image_processing/test_digital_image_processing.py b/digital_image_processing/test_digital_image_processing.py
index 1915f17e9..89cf6007a 100644
--- a/digital_image_processing/test_digital_image_processing.py
+++ b/digital_image_processing/test_digital_image_processing.py
@@ -78,7 +78,7 @@ def test_sepia():
     assert sepia.all()
 
 
-def test_burkes(file_path: str="digital_image_processing/image_data/lena_small.jpg"):
+def test_burkes(file_path: str = "digital_image_processing/image_data/lena_small.jpg"):
     burkes = bs.Burkes(imread(file_path, 1), 120)
     burkes.process()
     assert burkes.output_img.any()