如何在Reportlab中引用模型

from reportlab.lib.pagesizes import letter
from reportlab.pdfgen import canvas

c = canvas.Canvas("example.pdf", pagesize=letter)

model_data = [
    {'name': 'John', 'age': 30, 'city': 'New York'},
    {'name': 'Alice', 'age': 25, 'city': 'London'},
    {'name': 'Bob', 'age': 35, 'city': 'Paris'}
]

font_size = 12
line_height = 14
column_width = 100
margin = 50

x = margin
y = 700

# 添加表头
c.setFont("Helvetica-Bold", font_size)
c.drawString(x, y, "Name")
c.drawString(x + column_width, y, "Age")
c.drawString(x + 2 * column_width, y, "City")
y -= line_height

# 添加模型数据
c.setFont("Helvetica", font_size)
for data in model_data:
    c.drawString(x, y, data['name'])
    c.drawString(x + column_width, y, str(data['age']))
    c.drawString(x + 2 * column_width, y, data['city'])
    y -= line_height

c.save()