Task

"""

The function accepts as a path parameter for a text file (string).
The path whose path is passed as an argument contains a list of integers from 1 to n that are not sorted, comma separated, with one of the numbers in the sequence disappearing (i.e. missing from the sorted list).

Who_is_missing function operation:
A. The function returns the missing number in sequence (int).
B. The function writes the missing number in succession to a new file called found.txt.

Example of an input file and running the who_is_missing function

A file called findMe.txt:

8,1,9,7,4,6,3,2

Run 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

"""



"""

A. The function returns the missing number in sequence (int).
B. The function writes the missing number in succession to a new file called found.txt.

"""
def who_is_missing(file_name):
    destination = r"R:\D\Studies\! Python\! Israeli Python\Small programs\Part of program files\4\found.txt" # Your new destination
    a = "" # New variable
    c = "" # New variable
    with open (file_name, "r") as file_name: # Opening the file and closing automatically after finishing to use
        for num in file_name: # Printing the lines from the file
            a += num # Adding the lines in to the new variable
            b = int(max(a)) # Get the maximum number from the listed numbers in the file in order to use it for the loop
            for i in range(1, b): # The loop starts from one and going up to maximum number from the file
                if str(i) not in a: # Converting variable "i" from the loop into str in order to check if there is a number like that in the file and if not so you add this number to the new variable "c"
                    c += str(i) # If there is a no such number in the file it will add it to variable "c"
    with open (destination, "w") as destination: # Opens a file destination to edit it by "w" and copy the result to it
        destination.write(c) # Writting the result to the new file destination







def main():	
    who_is_missing(r"C:\.....")

if __name__ == "__main__":
    main()