import csv

def export_lists_to_csv(data_list, filename="results.csv", fieldnames=None):

"""

Exports a list of lists to a CSV file. Handles empty lists and missing fieldnames.

Args:

data_list (list of lists): The data to export.

filename (str): The name of the CSV file to create. Defaults to "results.csv".

fieldnames (list): A list of fieldnames for the CSV header. If None,

the first row of data is used as headers.

"""

if not data_list:

print("Warning: Input list is empty. No CSV file will be created.")

return

try:

with open(filename, 'w', newline='') as csvfile:

writer = csv.writer(csvfile)

if fieldnames is None:

fieldnames = data_list[0] # Use first row as headers

writer.writerow(fieldnames)

for row in data_list:

writer.writerow(row)

except Exception as e:

print(f"Error exporting to CSV: {e}")

if __name__ == '__main__':

# Example usage:

data = [

['Name', 'Age', 'City'],

['Alice', 30, 'New York'],

['Bob', 25, 'London'],

['Charlie', 35, 'Paris']

]

export_lists_to_csv(data, "people.csv")

# Example with no header and specific filename

data2 = [

[1, 2, 3],

[4, 5, 6],

[7, 8, 9]

]

export_lists_to_csv(data2, "numbers.csv", fieldnames=['col1', 'col2', 'col3'])

# Example with empty list

empty_data = []

export_lists_to_csv(empty_data, "empty.csv")