🔒 Getting an Value error in my code for file handling with CSV files

[shell creek]

code: ```py
import csv

def read_file(filename):
try:
with open(filename, "r", newline="") as f1:
return f1
except FileNotFoundError:
print("File not found")
return None

def print_averages(fileobj):
if fileobj is None:
return

a = csv.reader(fileobj)
next(a)  # Skip header row

collection_of_grades = []
for i in a:
    for j in range(len(i)):
        if j in (1, 2, 3):  # Check if the column index is 1, 2, or 3
            collection_of_grades.append(float(i[j]))

avg = sum(collection_of_grades) / len(collection_of_grades)
print("Average grade:", avg)

filename = r"C:\Users\blufl\OneDrive\Desktop\CMPT120\Actual code\grades.csv"
def main(filename):
fileobj = read_file(filename)
if fileobj:
print_averages(fileobj)
else:
print("Unable to open file:", filename)

main(filename)

Error message: ```Exception has occurred: ValueError
I/O operation on closed file.
  File "C:\Users\blufl\OneDrive\Desktop\CMPT120\Actual code\lab7p1.py", line 15, in print_averages
    a = csv.reader(fileobj)
        ^^^^^^^^^^^^^^^^^^^
  File "C:\Users\blufl\OneDrive\Desktop\CMPT120\Actual code\lab7p1.py", line 31, in main
    print_averages(fileobj)
  File "C:\Users\blufl\OneDrive\Desktop\CMPT120\Actual code\lab7p1.py", line 35, in <module>
    main(filename)
ValueError: I/O operation on closed file.```

[summer wren]

@shell creek

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[shell creek]

this was an assignment i should add which required me to have a diff "file reading" function. I havent ever done this way which is why im encountering so many issues. Ive tried a number of different things such as asking chatgpt etc..

[quiet wagon]

you open a context manager, and then leave the context (using return), that closes the file

just return a plainly opened file if you want it to stay opened

[zinc tundra]

The issue is this py with open(filename, "r", newline="") as f1: return f1
Even though it looks like you escape the with, you don't. The __exit__ is still called so when you return the file closes. You can use just open instead of with open to handle closing it yourself.

[shell creek]

oh really? thats it? wow

tysm ill just try it out

it worked tysm i appreciate your help @quiet wagon and @zinc tundra

[zinc tundra]

👍 If all is good, !close to close this post.

[foggy carbon]

and remember to close the file when you're down with it too since you don't have the context manager to help you with that anymore

[summer wren]

Python help channel closed

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