fixed the flake8 errors

string-formatting/string-reversal.py

@@ -1,41 +1,37 @@
 # ------------------------------------------------------------------------------------
 # We're going to look at a few different ways that you can reverse the structure of a string .
-# Let's begin 
+# Let's begin.
 # ------------------------------------------------------------------------------------
 
 # Single Words , A string is an iterable and anything within these --> ""
 # 1. The built-in reverse method
 # This method is used on iterables , commonly on lists and strings
-# Example of a function that reverses a string 
+# Example of functions that reverse a string.
 def reverseString(word):
     reversedWord = "".join(reversed(word))
     return reversedWord
 '''
 Let's break down what's above:
 Remember that all strings are immutable but iterable. So if that's the case , we can't use the .reverse() function like we could on a list.
 So we iterate through each letter and use the reversed() function . Now since the reversed() function return an iterable;a list .
-We use the join() to concatenate the letters and then we return the reversed String 
+We use the join() to concatenate the letters and then we return the reversed String.
 '''
-#2. The reverse slice method
+# 2.The reverse slice method
 # This method also works on iterables too.
 # Let's use the same example with this method too
-def reverseString(word):
+def backString(word):
     reversedWord = word[::-1]
     return reversedWord
 '''
 Let's break this down as well:
 The slicing technique is used to get a certain portion of string and using the starting and ending index values.
 e.g [a:b], this slices from position to position before b ; so b-1 . What we don't commonly use is the third option of [a:b:c] <-- C.
-What c does is specify the number of characters to jump or skip over . So if c == 2 , we're gonna skip over 2 characters .
-But if c == -1 , this specifies that the string begins from the back . 
-We commonly use -1 when we want the last letter or character in a string e.g word = "pet" , word[-1] == t.
+What c does is specify the number of characters to jump or skip over . So if c == 2 , we're gonna skip over 2 characters .But if c == -1,this specifies that the string begins from the back.
+We commonly use -1 when we want the last letter or character in a string e.g word = "pet",word[-1] == t.
 Back to the function , if we don't specify the starting and end values , the computer just assumes it's the whole string .
 So e.g [a:] this is from a to the last , [:b] from the first to b , [a::c] from a to the last every c characters , [:b:c] from the first to b every c characters .
 So [::-1]  means from the first to last in reverse .
 '''
 
-
-
 # ------------------------------------------------------------------------------------
 # The format is the same even for sentences : So write a function that reverses the sentence "I love ketchup".
-# ------------------------------------------------------------------------------------