如何从CSV文件读取单独的行？

Question

At the moment I've got this function:

def writer(file_name)
    open_file = open(file_name,"r+", newline='')
    csv_output = csv.writer(open_file) 
    csv_output.writerow(student)
    open_file.close()

where student is:

"string_1","string_2",int

I'm looking to read through the file first and check if the "string_1" that I'm writing matches any of the "string_1" s already written, but I can't find a built-in function that lets me read each line and store it as a list.

Answer 1

First, you have to open the file for reading, go through the file line by line and return, if "string_1" is found:

def append_student(file_name, student)
    with open(file_name, "r") as f:
        for line in csv.reader(f):
            if line[0] == student[0]:
                return
    with open(file_name, "a") as f:
        csv.writer(f).writerow(student)