You can use the PyPDF2 library to join two PDF files in Python. Here's an example code to do so:

import PyPDF2

# Open the first PDF file
pdf1 = PyPDF2.PdfFileReader(open("file1.pdf", "rb"))

# Open the second PDF file
pdf2 = PyPDF2.PdfFileReader(open("file2.pdf", "rb"))

# Create a new PDF file to write the merged content
pdf_merged = PyPDF2.PdfFileWriter()

# Add the pages of the first PDF file
for page in range(pdf1.getNumPages()):
    pdf_merged.addPage(pdf1.getPage(page))

# Add the pages of the second PDF file
for page in range(pdf2.getNumPages()):
    pdf_merged.addPage(pdf2.getPage(page))

# Write the merged content to the output PDF file
with open("merged.pdf", "wb") as output_file:
    pdf_merged.write(output_file)

This code uses the ´PdfFileReader´ class from the ´PyPDF2´ library to open both PDF files, and the ´PdfFileWriter´ class to create a new PDF file to write the merged content. The code then loops through the pages of each PDF file and adds them to the new ´pdf_merged´ object using the ´addPage´ method. Finally, the code writes the merged content to a new output file named "merged.pdf".
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