jpg图片打包生成pdf文件的几种方式

img2pdf模块（固定成A4纸张大小）：

import img2pdf
def makePdf(pdfFileName, jpg_name_list):
    a4inpt = (img2pdf.mm_to_pt(210),img2pdf.mm_to_pt(297))
    layout_fun = img2pdf.get_layout_fun(a4inpt)
    with open(pdfFileName,'wb') as f:
           f.write(img2pdf.convert(jpg_name_list, layout_fun=layout_fun))

PyPDF4模块（自己确定纸张大小）：

def makePdf(pdfFileName, jpg_name_list):
    pdf_lis = []
    for jpg_file in jpg_name_list:
        cover = Image.open(jpg_file)
        width, height = cover.size
        pdf = FPDF(unit="pt", format=[width, height])
        pdf.add_page()
        pdf.image(jpg_file, 0, 0)
        pdf_lis.append(jpg_file + ".pdf")
        pdf.output(jpg_file + ".pdf", "F")

    merger = PyPDF4.PdfFileMerger()
    for filename in pdf_lis:
        merger.append(PyPDF4.PdfFileReader(filename))
    merger.write(pdfFileName)

    for pdf_filename in pdf_lis:
        os.remove(pdf_filename)

以上两种可以保证转换的jpg图片保持在固定大小的纸张内，而不出现只有一半的错误