python - how to find a string existing in file using mmap -


i have function take list of urls , save in file based on first letter of url. first, removed http:// , filter first letter , join first letter file extension , fine file search whether url exists in file if exists skip if not write in file , append diff_url_list here source code

def checkdiffurls(url_list): import mmap diff_url_list=[] file_extension="txt" urls in url_list:      temp_url=urls.replace("http://","")      url_head=temp_url[0][0]      path=".".join((url_head,file_extension))      file=open("urls/"+path,'w')      file_read = mmap.mmap(file.fileno(), 0, access=mmap.access_read)      if urls not in file_read:          file.write(urls)          diff_url_list.append(urls)      file.close()  return diff_url_list

it gives me error mmap length greater file size can fix bug? thank you. appreciate that.


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