pdffiles [for filename in os listdir(')if filename endswith(pdf')pdffiles append(filenamepdffiles sort(key str lowerpdfwriter pypdf pdffilewriter(todoloop through all the pdf files todoloop through all the pages (except the firstand add them todosave the resulting pdf to file after the shebang line and the descriptive comment about what the program doesthis code imports the os and pypdf modules the os listdir('call will return list of every file in the current working directory the code loops over this list and adds only those files with the pdf extension to pdffiles afterwardthis list is sorted in alphabetical order with the key str lower keyword argument to sort( pdffilewriter object is created to hold the combined pdf pages finallya few comments outline the rest of the program step open each pdf now the program must read each pdf file in pdffiles add the following to your program#python combinepdfs py combines all the pdfs in the current working directory into single pdf import pypdf os get all the pdf filenames pdffiles [--snip-loop through all the pdf files for filename in pdffilespdffileobj open(filename'rb'pdfreader pypdf pdffilereader(pdffileobjtodoloop through all the pages (except the firstand add them todosave the resulting pdf to file for each pdfthe loop opens filename in read-binary mode by calling open(with 'rbas the second argument the open(call returns file objectwhich gets passed to pypdf pdffilereader(to create pdffilereader object for that pdf file