[Python] How split (chunk) a list of customers along month/year?

I need to understand how I can generate a list for book list of customers for each month and year.

In my file .txt I have list mail (like 5000) customers and need reserve booking for max 500 customers for each month.

month= ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']

year = ['2024', '2025', '2026', '2027', '2028', '2029', '2030', '2031', '2032']

l_lines = ['a@a', 'b@b'.... ]

def generate_list_email_month(l_lines):
kk = [l_lines[i:i + 500] for i in range(0, len(l_lines), 500)]
mail_k = []

for i,x in enumerate(kk):
list_mails = [y for y in x]
mail_k.append(list_mails)

return mail_k


month_years = [f"{y}-{x}" for y in monthfor x in year]


Now I need to generate list of 500 customers booked for month_years like:

Jan-2024 = ['a@a', 'b@b'.... ]
Feb-2024 = ['c@c', 'd@d'.... ]


Any suggestions on how to do it?

Thanks

For now I get the same customers but for each Jan of Year like this:

['aa@aa|Jan-2024', 'aa@aa|Jan-2025', 'aa@aa|Jan-2026']

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