Permissionerror: [Winerror 32] Another program is using this file, the process is unable to access

I found a problem when I was consolidated today, and I couldn't delete the source file after I merged the PDF file.

Permissionerror: [Winerror 32] Another program is using this file, the process is unable to access

This error has occurred, and I tried to delete the source file manually, and the file has been opened by Python and the prompt that cannot be operated.

explain

Lite mean, this file has been occupied, you can't access him.

Code

def merge_pdf(name,file_all,target_path):
    total=PdfFileWriter()
    totalPages=0
    for pdf_file in file_all:                  
        print(pdf_file)            
        # Read PDF files
        pic=open(pdf_file,'rb')            
        input_pdf=PdfFileReader(pic)
                 # Get the number of pdf total pages
        pagecount=input_pdf.getNumPages()
        print(pagecount)
        totalPages+=pagecount
                 # Traversing each PDF file
        for iPage in range(pagecount):
                         #        
            total.addPage(input_pdf.getPage(iPage))
        #pic.close()
        #os.remove(pdf_file)    
         Print (Totalpages, 'Sharing PDF file merge ...')
    target_name=name+'.pdf'
    
    new=os.path.join(target_path,target_name)
    with open(new,'wb') as outputfile:
        total.write(outputfile)

reason

The reason is that I didn't turn it off after reading the feeding file, causing him to have a cache.

I tried to turn off the delete operation in the comment location, I successfully deleted the source PDF file.

But I am surprised to find that the merged documents are all blank.

It turned out that I deleted the source file, causing no data when writing.

solve

I am inserting a write operation before turning off.

The purpose of deleting the source file after successfully reaching the merger.

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