Python error typeerror:write () argument must is str, not bytes

Remember, the following error occurred while opening the file using open today.

Note: I am using the Python3.6.1 version.

Typeerror:write () argument must is str, not bytes

Online search only to find that the original file opened the way there is a problem.

The statement before the file opened is:

FileHandle = open (Wav_file, ' W ')

Then open with binary mode without this problem:

FileHandle = open (Wav_file, ' wb+ ')

The problem arises because the default mode of storage is binary.

Python error typeerror:write () argument must is str, not bytes