在文本文件中搜索字符串并与此字符串在同一行上编写

Question

I am writing a simple arithmetic quiz. My aim is to store the score and name of the participants to a text file, however if they have already taken the test before then the score should be appended to the same line as their name is on. This is my code:

src = open("Class {} data.txt".format(classNo),"a+",)
for line in src:
    if surname.lower() in line:
        print("yes")
        # score should be written on same line as the surname is in the txt fileS
        src.write(score)
    else:
        print("nope")

src.close()    

However there is no evidence that python has executed the if statement as neither "yes", nor "nope" has been printed and the text file remains the same.

Answer 1

with open("Class {} data.txt".format(classNo),"a+",) as src:
    lines = src.readlines() # all lines are stored here
    for ind,line in enumerate(lines):
        if surname.lower() in line:
            print("yes")
            # score should be written on same line as the surname is in the txt fileS
            lines[ind] = "{} {}\n".format(line.rstrip(), score) # add first or new scores 
        else:
            print("nope")
    with open("Class {} data.txt".format(classNo),"w",) as src: # reopen and write updated lines
        src.writelines(lines)

Or use fileinput.input with inplace=True :

import fileinput
for line in fileinput.input("Class {} data.txt".format(classNo),inplace=True):
    if surname.lower() in line:
        print("{} {}".format(line.rstrip(), score))
    else:
        print(line.rstrip())