pdfpcell设置居中

您可以使用`PdfPCell.setHorizaontalAlignment()`方法将单元格中的内容水平居中。例如：

from reportlab.lib.enums import TA_CENTER
from reportlab.lib import colors
from reportlab.lib.pagesizes import letter
from reportlab.platypus import SimpleDocTemplate, Table, TableStyle
from reportlab.pdfgen import canvas
from reportlab.lib.units import inch
from reportlab.lib.styles import getSampleStyleSheet


doc = SimpleDocTemplate("pdf.pdf", pagesize=letter)
pdf_canvas = canvas.Canvas("pdf.pdf")


# 创建单元格
data = [['A', 'B', 'C'],
        ['D', 'E', 'F'],
        ['G', 'H', 'I']]

table = Table(data)

# 设置单元格样式
style = TableStyle([
    ('BACKGROUND', (0, 0), (-1, 0), colors.grey),
    ('TEXTCOLOR', (0, 0), (-1, 0), colors.whitesmoke),
    ('ALIGN', (0, 0), (-1, 0), 'CENTER'),
    ('FONTNAME', (0, 0), (-1, 0), 'Helvetica-Bold'),
    ('FONTSIZE', (0, 0), (-1, 0), 14),
    ('BOTTOMPADDING', (0, 0), (-1, 0), 12),
    ('BACKGROUND', (0, 1), (-1, -1), colors.beige),
    ('TEXTCOLOR', (0, 1), (-1, -1), colors.black),
    ('ALIGN', (0, 1), (-1, -1), 'CENTER'),
    ('FONTNAME', (0, 1), (-1, -1), 'Helvetica'),
    ('FONTSIZE', (0, 1), (-1, -1), 12),
    ('BOTTOMPADDING', (0, 1), (-1, -1), 8),
])

table.setStyle(style)

elements = []
elements.append(table)
doc.build(elements)

在上面的样例中，我们使用`('ALIGN', (0, 0), (-1, 0), 'CENTER')`将第一行的单元格置为水平居中。