[Python] for loop traverses more than 2 parameters

Python version: Python37

Example 1:

LANGS = [
    ['PYTHON', 1],
    ['Perl', 2],
    ['Ruby', 3],
    ['Lua', 4]]

for lang, num in LANGS:
    print('lang=', lang)
    print('num=', num)

result:

Example 2

LANGS = [
    ('PYTHON', 1),
    ('Perl', 2),
    ('Ruby', 3),
    ('Lua', 4)]

for lang, num in LANGS:
    print('lang=', lang)
    print('num=', num)

result: