fpdf2错误的参数无效值“ new_x”
我正在尝试关注此 tutorial ，特别是 tuto 2 em>，但我一直遇到以下错误，我不知道为什么。我复制并粘贴了教程中的代码。我使用2.5.2版。
valueerror：参数“ new_x”（0）的无效值，必须是实例 枚举Xpos
from fpdf import FPDF
class PDF(FPDF):
def header(self):
# Rendering logo:
self.image("logo.png", 10, 8, 33)
# Setting font: helvetica bold 15
self.set_font("helvetica", "B", 15)
# Moving cursor to the right:
self.cell(80)
# Printing title:
self.cell(30, 10, "Title", 1, 0, "C")
# Performing a line break:
self.ln(20)
def footer(self):
# Position cursor at 1.5 cm from bottom:
self.set_y(-15)
# Setting font: helvetica italic 8
self.set_font("helvetica", "I", 8)
# Printing page number:
self.cell(0, 10, f"Page {self.page_no()}/{{nb}}", 0, 0, "C")
# Instantiation of inherited class
pdf = PDF()
pdf.alias_nb_pages()
pdf.add_page()
pdf.set_font("Times", size=12)
for i in range(1, 41):
pdf.cell(0, 10, f"Printing line number {i}", 0, 1)
pdf.output("tuto2.pdf")
I'm trying to follow this tutorial, specifically the Tuto 2, but I keep getting the following error and I don't know why. I copied and pasted the code from the tutorial. I'm on version 2.5.2.
ValueError: Invalid value for parameter "new_x" (0),must be instance
of Enum XPos
from fpdf import FPDF
class PDF(FPDF):
def header(self):
# Rendering logo:
self.image("logo.png", 10, 8, 33)
# Setting font: helvetica bold 15
self.set_font("helvetica", "B", 15)
# Moving cursor to the right:
self.cell(80)
# Printing title:
self.cell(30, 10, "Title", 1, 0, "C")
# Performing a line break:
self.ln(20)
def footer(self):
# Position cursor at 1.5 cm from bottom:
self.set_y(-15)
# Setting font: helvetica italic 8
self.set_font("helvetica", "I", 8)
# Printing page number:
self.cell(0, 10, f"Page {self.page_no()}/{{nb}}", 0, 0, "C")
# Instantiation of inherited class
pdf = PDF()
pdf.alias_nb_pages()
pdf.add_page()
pdf.set_font("Times", size=12)
for i in range(1, 41):
pdf.cell(0, 10, f"Printing line number {i}", 0, 1)
pdf.output("tuto2.pdf")
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看起来 github project
new_x和new_y的XPO和YPO对象。首先，在您的导入语句下方添加此直接：
来自fpdf.enums导入XPO，YPOS。这将带来您需要正确设置页码位置的课程。
然后更新
页脚函数 - 而不是self.cell（0，10，f“ page {self.page_no（）}}/{{nb}}}”，0，0，” c ”），使用self.cell（0，10，f“ page {self.page_no（）}}/{{nb}}}”，xpos.right，new_y = ypos.next，ypos.next，“ c” ）。Looks like the github project indicates that you need to be passing in an XPos and YPos object for
new_xandnew_y.First, add this right below your import statement:
from fpdf.enums import XPos, YPos.This will bring in the classes you need to correctly set the position of the page number.
Then update the
footerfunction - instead ofself.cell(0, 10, f"Page {self.page_no()}/{{nb}}", 0, 0, "C"), useself.cell(0, 10, f"Page {self.page_no()}/{{nb}}", XPos.RIGHT, new_y=YPos.NEXT, "C").