Python 3.5:typeerror:a Bytes-like object is required, not ' str '

The error often occurs when opening a text file through the open () function, using the ' RB ' attribute, such as: Filehandle=open (filename, ' RB '), when the file is opened in binary mode, so if the STR () function is used in the later processing, The error will occur, and the error will no longer appear in the Python2.

There are two ways to solve the problem:

The first, using the ' R ' attribute in the open () function, which reads text, instead of ' RB ', is read in binary file, which solves the problem directly.

The second, using ' RB ' in the open () function, can be converted before use, with the following example from: http://stackoverflow.com/questions/33054527/ Python-3-5-typeerror-a-bytes-like-object-is-required-not-str

1: When locating a file: With open (fname, ' RB ') as F:                if B ' some-pattern ' in tmp:continue2: When using socketl connection: Mysock = socket.socket (socket . af_inet, Socket. Sock_stream) Mysock.connect ((' www.py4inf.com ',) mysock.send (**b** ' GET http://www.py4inf.com/code/romeo.txt http /1.0\n\n ') while True:    data = MYSOCK.RECV (+)    if (len (data) < 1):        break    print (data); Mysock.close ( ) 3: Encode in advance: with open (fname, ' RB ') as F:    lines = [X.decode (' UTF8 '). "Strip () for x in F.readlines ()]

Python 3.5:typeerror:a Bytes-like object is required, not ' str '