Create unit9_ex9.2.3.py

Author: lironmiz

unit9_ex9.2.3.py

@@ -0,0 +1,47 @@
+# exercise 9.2.3 from unit 9
+'''
+Write a function called who_is_missing defined as follows:
+
+def who_is_missing(file_name):
+The function accepts as a parameter a path to a text file (string).
+The file we return is passed as an argument and contains a list of integers from 1 to some n, which are not sorted, separated by commas, when one of the numbers in the sequence disappears (that is, missing from the sorted list).
+
+The operation of the who_is_missing function:
+A. The function returns the missing number in the sequence (int).
+B. The function writes the missing number in sequence to a new file called found.txt.
+
+An example of an input file and the execution of the who_is_missing function
+A file called findMe.txt:
+
+8,1,9,7,4,6,3,2
+Running the who_is_missing function on the findMe.txt file:
+
+>>> who_is_missing("c:\findMe.txt")
+5
+After the above run of the who_is_missing function, a new file called found.txt is created:
+
+5
+'''
+
+def who_is_missing(file_name):
+    # Read the file and extract the numbers
+    with open(file_name, 'r') as f:
+        numbers = [int(num) for num in f.read().split(',')]
+
+    # Find the missing number
+    expected_sum = sum(range(1, len(numbers) + 1))
+    actual_sum = sum(numbers)
+    missing_number = expected_sum - actual_sum
+
+    # Write the missing number to a new file
+    with open('found.txt', 'w') as f:
+        f.write(str(missing_number))
+
+    return missing_number
+
+def main():
+    result = who_is_missing("c:\findMe.txt")
+    print(result)
+
+if __name__ == "__main__":
+    main()