text file operations

txt_file_ops.py

def write_to_text_file(filename, data):
    with open(filename, 'w') as file:
        # Write a single line
        file.write("Header: Name, Age, City\n")

        # Write multiple lines
        for line in data:
            file.write(','.join(map(str, line)) + '\n')

    print(f"Data written to {filename}.")

def append_to_text_file(filename, new_data):
    with open(filename, 'a') as file:
        # Append a single line
        file.write(','.join(map(str, new_data)) + '\n')

    print(f"Data appended to {filename}.")

def read_from_text_file(filename):
    try:
        with open(filename, 'r') as file:
            # Read the entire file
            content = file.read()
            print("File Content:\n", content)

            # Move the file cursor to the beginning
            file.seek(0)

            # Read one line at a time
            line = file.readline()
            print("First Line:", line)

            # Move the file cursor to the beginning
            file.seek(0)

            # Read all lines into a list
            lines = file.readlines()
            print("All Lines as List:")
            for line in lines:
                print(line.strip())  # strip() removes leading and trailing whitespaces

            # Get the current position of the file cursor
            position = file.tell()
            print("Current Position:", position)
    except FileNotFoundError:
        print(f"{filename} not found.")
    except Exception as e:
        print(f"Error reading {filename}: {e}")

# Example usage:
filename = "example_text_file.txt"
data_to_write = [
    ["John", 30, "New York"],
    ["Alice", 25, "San Francisco"],
    ["Bob", 35, "Los Angeles"]
]

# Write to a text file
write_to_text_file(filename, data_to_write)

# Append to a text file
new_data_to_append = ["Charlie", 40, "Chicago"]
append_to_text_file(filename, new_data_to_append)

# Read from a text file
read_from_text_file(filename)