Invoice Generator

 pip install reportlab

from reportlab.lib.pagesizes import letter

from reportlab.pdfgen import canvas

def generate_invoice(client_name, items, tax_rate=0.05, filename="invoice.pdf"):

    c = canvas.Canvas(filename, pagesize=letter)

    width, height = letter

    # Title

    c.setFont("Helvetica-Bold", 16)

    c.drawString(50, height - 50, "INVOICE")

    # Client Details

    c.setFont("Helvetica", 12)

    c.drawString(50, height - 80, f"Client: {client_name}")

    # Table Headers

    c.setFont("Helvetica-Bold", 12)

    c.drawString(50, height - 120, "Item")

    c.drawString(250, height - 120, "Quantity")

    c.drawString(350, height - 120, "Price")

    c.drawString(450, height - 120, "Total")

    # Invoice Items

    c.setFont("Helvetica", 12)

    y_position = height - 140

    total_cost = 0

    for item, details in items.items():

        quantity, price = details

        total = quantity * price

        total_cost += total

        c.drawString(50, y_position, item)

        c.drawString(250, y_position, str(quantity))

        c.drawString(350, y_position, f"${price:.2f}")

        c.drawString(450, y_position, f"${total:.2f}")

        y_position -= 20

    # Tax and Total Calculation

    tax_amount = total_cost * tax_rate

    grand_total = total_cost + tax_amount

    c.setFont("Helvetica-Bold", 12)

    c.drawString(350, y_position - 20, "Subtotal:")

    c.drawString(450, y_position - 20, f"${total_cost:.2f}")

    c.drawString(350, y_position - 40, f"Tax ({tax_rate * 100}%):")

    c.drawString(450, y_position - 40, f"${tax_amount:.2f}")

    c.drawString(350, y_position - 60, "Grand Total:")

    c.drawString(450, y_position - 60, f"${grand_total:.2f}")

    # Save PDF

    c.save()

    print(f"✅ Invoice saved as {filename}")