Added swap case program and removed unexpected expression part

sorts/cocktail_shaker_sort.py

@@ -42,4 +42,4 @@ def cocktail_shaker_sort(unsorted: list) -> list:
     doctest.testmod()
     user_input = input("Enter numbers separated by a comma:\n").strip()
     unsorted = [int(item) for item in user_input.split(",")]
-    print(f"{cocktail_shaker_sort(unsorted) = }")
+    print(f"{cocktail_shaker_sort(unsorted) }")

strings/naive_string_search.py

@@ -39,4 +39,4 @@ def naive_pattern_search(s: str, pattern: str) -> list:
 
 if __name__ == "__main__":
     assert naive_pattern_search("ABCDEFG", "DE") == [3]
-    print(f"{naive_pattern_search('ABAAABCDBBABCDDEBCABC', 'ABC') = }")
+    print(f"{naive_pattern_search('ABAAABCDBBABCDDEBCABC', 'ABC')}")

strings/swap_case.py

@@ -0,0 +1,48 @@
+'''
+This algorithm helps you to swap cases.
+
+User will give input and then program will perform swap cases.
+
+In other words, convert all lowercase letters to uppercase letters and vice versa.
+For example:
+1)>>>Please input sentence: Algorithm.Python@89
+  aLGORITHM.pYTHON@89
+2)>>>Please input sentence: github.com/mayur200
+  GITHUB.COM/MAYUR200
+
+Constraints: Length of string should between 1 and 1000
+
+
+'''
+import re
+'''
+This re.compile() function saves the pattern from 'a' to 'z' and 'A' to 'Z' into 'regexp' variable
+'''
+regexp = re.compile('[^a-zA-Z]+')
+
+
+def swap_case(sentence):
+    """
+    This function will convert all lowercase letters to uppercase letters and vice versa.
+    >>>swap_case('Algorithm.Python@89')
+    aLGORITHM.pYTHON@89
+    """
+    if len(sentence) < 1001:
+        newstring = ''
+        for word in sentence:
+            if word.isupper() == True:
+                newstring += word.lower()
+            if word.islower() == True:
+                newstring += word.upper()
+            if regexp.search(word):
+                newstring += word
+
+    else:
+        raise Exception("Charater length should be between 1 and 1000")
+    return newstring
+
+
+if __name__ == '__main__':
+    s = input("Please input sentence:")
+    result = swap_case(s)
+    print(result)