How do i save my replacement to the file in python as it will print but when i check in the file it-CodePudding

for line in file:
    if ammend_f and ammend_l in line:
      print(line)
      
      change_sc = int(input("Would you like to change the score for this student?\n1) Yes\n2) No\n--\n"))
      if change_sc == 1:
        #new_score = input("New score: ")
        adjust_array = line.split(",")
        #adjust_array[2] = str(new_score)
        import sys
        import fileinput
 
        #x = input("Enter old score: ")
        x = adjust_array[2]
        print(adjust_array[0] "'s" , "score is" , x)
        y = input("Enter new score: ")
 
        for l in fileinput.input(files = "test_results.csv"):
            l = l.replace(x, y)
            sys.stdout.write(l)
      
      if change_sc == 2:
        print("{No changes made}")

When i run the program, everything works but it wont save my changes to file. the changes will come up and print but when i check back in the file, everything has stayed the same. btw this is only one part of my code

CodePudding user response：

The string l is in memory, and sys.stdout doesn't write back into files.

If you want to replace text in a file, you need to open the file and write all previous and replaced lines back to it

CodePudding user response：

With the code provided, there are issues remaining before writing the file changes.

# Test file
file = open('test1.txt')

for line in file:
    if 'ammend_f' and 'ammend_l' in line: # changed 'ammend_f' and 'ammend_l' to string
        print(line)

        change_sc = int(input(
            "Would you like to change the score for this student?\n1) "
            "Yes\n2) No\n--\n"))
        if change_sc == 1:
            # new_score = input("New score: ")
            adjust_array = line.split(",")
            # adjust_array[2] = str(new_score)
            import sys
            import fileinput

            # x = input("Enter old score: ")
            x = adjust_array[2]
            print(adjust_array[0]   "'s", "score is", x)
            y = input("Enter new score: ")

            for l in fileinput.input(files="test_results.csv"):
                l = l.replace(x, y)
                sys.stdout.write(l)

        if change_sc == 2:
            print("{No changes made}")

Results:

Traceback (most recent call last):
  File "C:\Users\ctynd\OneDrive\CodeBase\StackOverflowActivity\QuestionFiles\Q100_original_Code.py", line 19, in <module>
    x = adjust_array[2]
IndexError: list index out of range