Join Many PDF Files into one (Merge PDF)

# -*- coding: utf-8 -*-
"""
Created on Thu Nov 20 11:51:48 2018
@author: wagner
"""

#Imports:
from PyPDF2 import PdfFileMerger, PdfFileReader, PdfFileWriter


def pdf_add_page():
    output = PdfFileWriter()
    for FileName in FileList:
        filename1 = '%s/%s.pdf' %(path, FileName)
        file1 = PdfFileReader(file(filename1, "rb"))
        output.addPage(file1.getPage())

    filename2 = '%s/%s.pdf' %(path, 'file_pdf_full')
    outputStream = file(filename2, "wb")
    output.write(outputStream)
    outputStream.close()

path = '/home/wagner/SSI/BancoInter/'
FileList = ['file_pdf_pag1-3', 'file_pdf_pag3-5']

merger = PdfFileMerger()
for FileName in FileList:
    filename1 = '%s/%s.pdf' %(path, FileName)
    merger.append(PdfFileReader(file(filename1, 'rb')))
filename2 = '%s/%s.pdf' %(path, 'file_pdf_full')
merger.write(filename2)