from fpdf import FPDF
pdf = FPDF()
pdf.add_page()
pdf.set_font('helvetica', '', 12)
pdf.cell(10, 10, "Page 1")
pdf.add_page()
pdf.cell(10, 10, "Page 2")
try:
    pdf.page = 1
    pdf.cell(10, 20, "Back to Page 1")
    pdf.page = 2
    print("Success")
except Exception as e:
    print("Failed:", repr(e))