Merge pull request #105 from lironmiz/unit7-Ex7.2.5

Create unit7_ex7.2.5.py

Author: lironmiz

unit7_ex7.2.5.py

@@ -0,0 +1,32 @@
+# exercise 7.2.5 from unit 7
+'''
+Write a function called sequence_del defined as follows:
+
+def sequence_del(my_str):
+The function accepts a string and deletes the letters appearing in sequence. That is, the function returns a string in which only one character appears from each sequence of identical characters in the input string.
+
+Running examples of the sequence_del function
+>>> sequence_del("ppyyyyythhhhhooonnnnn")
+python
+>>> sequence_del("SSSSsssshhhh")
+'ssh'
+>>> sequence_del("Heeyyy yyouuuu!!!")
+'Hey you!'
+'''
+
+def sequence_del(my_str):
+    result = ""
+    prev_char = ""
+    for char in my_str:
+        if char != prev_char:
+            result += char
+        prev_char = char
+    return result
+
+def main():
+    print(sequence_del("ppyyyyythhhhhooonnnnn"))
+    print(sequence_del("SSSSsssshhhh"))
+    print(sequence_del("Heeyyy yyouuuu!!!")) 
+
+if __name__ == "__main__":
+    main()