Function to handle large file

Here's the completed code implementing your requirements:

python
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# Define read_large_file()
def read_large_file(file_object):
    """A generator function to read a large file lazily."""

    # Loop indefinitely until the end of the file
    while True:

        # Read a line from the file: data
        data = file_object.readline()

        # Break if this is the end of the file
        if not data:
            break

        # Yield the line of data
        yield data

# Open a connection to the file
with open('world_dev_ind.csv') as file:

    # Create a generator object for the file: gen_file
    gen_file = read_large_file(file)

    # Print the first three lines of the file
    print(next(gen_file))
    print(next(gen_file))
    print(next(gen_file))

Explanation:

read_large_file(file_object):

Reads a file line by line using .readline().
Uses a generator (yield) to return lines one at a time.
Stops when it reaches the end of the file.

with open('world_dev_ind.csv') as file::

Opens the file using a context manager to ensure proper handling.

Creating a generator object:

Calls read_large_file(file) to get an iterator.

Printing the first three lines:

Uses next(gen_file) to fetch the first three lines lazily.

This approach efficiently handles large files without loading them entirely into memory. 🚀