[Python] Generating an invoice with FPDF

I tried using the reportLab library with no luck. For some reason, it wouldn't write the file. I am not sure if it was permission issues but w.e. . Now I am happily using fpdf but I am lost in this little error.

Traceback (most recent call last):
File "/Users/User/Desktop/Invoice Maker/invoice_maker.py", line 40, in <module>
pdf_inv.generate_pdf()
AttributeError: 'PdfInvoice' object has no attribute 'generate_pdf'


Where am I going wrong?

import fpdf
from datetime import datetime

from datetime import datetime
from collections import namedtuple

Creator = namedtuple("Creator", ["first_name", "last_name", "email", "phone_num","address", "city", "country"])
Organization = namedtuple("Organination", ["name", "address", "city", "country"])
Project = namedtuple("Project", ["name", "description", "amount"])
File = namedtuple("File", ["filename", "font_size", "line_height", "orientation"])
PdfInvoice = namedtuple("PdfInvoice", ["invoice_num", "creator", "organization", "project", "file"])

def generate_pdf(self):
dt = datetime.now()
date = dt.date()
pdf = fpdf.FPDF(format=self.file.orientation)
pdf.add_page()
pdf.set_font("Arial", size=self.file.font_size)

pdf_content = [
f"Invoice Number #{self.pdf_inv}",
f"Date Invoiced #{date}",
# and so on and so forth
]

for line in pdf_content:
pdf.write(self.file.line_height, line)
pdf.ln()

pdf.output(self.file.filename)

if __name__ == "__main__":
creator = Creator('Test', 'User', 'test@gmail.com', 'Testtest','Testtest Testtest, 123 Test road', 'Testtest', 'Testtest')
organization = Organization('Test Org', 'Testtest', 'Testtest','Testtest')
file = File("Invoice.pdf", 12, 5, "letter")
project = Project('Ecommerce site', 'Worked on the ecommerce site', 10.900)
pdf_inv = PdfInvoice('1393939', creator, organization, project,file)
pdf_inv.generate_pdf()

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