파일 작업의 예외 처리

파일 작업에서 예외 처리하기

예외를 처리하는 이유

try-except 블록 사용하기

try:
    # Code that might raise an exception
except ExceptionType:
    # Code to handle the exception

FileNotFoundError 처리하기

try:
    # Tries to open a non-existent file
    with open("missing_file.txt", "r") as file:
        content = file.read()
        print(content)
except FileNotFoundError:
    print("Error: The file does not exist.")

여러 예외 처리하기

try:
    # Tries to open a file
    with open("example.txt", "r") as file:
        content = file.read()
        print(content)
except FileNotFoundError:
    print("Error: The file does not exist.")
except PermissionError:
    print("Error: You do not have permission to access this file.")

else와 finally 사용하기

try:
    with open("example.txt", "r") as file:
        content = file.read()
        print(content)
except FileNotFoundError:
    print("Error: The file does not exist.")
else:
    print("File read successfully!")
finally:
    print("This block runs no matter what.")

예외 발생

file_path = "data.txt"

try:
    if not file_path.endswith(".txt"):
        raise ValueError("Invalid file type! Only .txt files are allowed.")
    with open(file_path, "r") as file:
        content = file.read()
        print(content)
except ValueError as e:
    print("Error:", e)

잘하셨습니다!

사용자 지정 예외 메시지 사용

try:
    with open("config.json", "r") as file:
        content = file.read()
        print(content)
except FileNotFoundError as e:
    print("Custom Message: Unable to find the configuration file. Please ensure it exists.")

try:
    with open("data.csv", "r") as file:
        content = file.read()
        print(content)
except FileNotFoundError:
    print("The specified file was not found.")