Python如何获取类字节列表的长度

Question

I am using email IMAP4, and I get the number of emails with a given subject like below list, I also get it's type. My goal is to get the size or length of it:

  emailsUIDs = [b'80 83 84 85 86 87 88 89 90 91 93 126 136 137 138 139 140']
  print(type(emailsUIDs ))  # Prints --> type of Object =  <class 'list'>

  myLen = len((str(emailsUIDs ).replace("b'", "").replace("'", "")).split())

I tried len(emailsUIDs ) but I only get 1, is there a better way to get the length of emailsUIDs and not have to do string manipulation as I am doing

Answer 1

You have a list with one element (a bytes object). You need to do this to extract the list of ids:

emailsUIDs = [b'80 83 84 85 86 87 88 89 90 91 93 126 136 137 138 139 140']
ids_bytes = emailsUIDs[0]
ids_bytes_list = ids_bytes.split()
ids_list = map(int, ids_bytes_list)

then you can use the id's in numerical form from that list, or if you just needed the count you could have simply done len(ids_bytes_list) straight.