UnicodeDecodeError when running Python in Anaconda Prompt

Question

When I run python in Anaconda Prompt, I get the following error. It does not disrupt my Python experience in any visible way, but it still unnerves me regardless.

Any idea on why this is happening?

I'm using 2019/03 version of Anaconda with Python 3.7.3

(base) C:\Users>python
Python 3.7.3 (default, Mar 27 2019, 17:13:21) [MSC v.1915 64 bit (AMD64)] :: Anaconda, Inc. on win32
Type "help", "copyright", "credits" or "license" for more information.
Failed calling sys.__interactivehook__
Traceback (most recent call last):
  File "C:\Users\Anaconda3\lib\site.py", line 439, in register_readline
    readline.read_history_file(history)
  File "C:\Users\Anaconda3\lib\site-packages\pyreadline\rlmain.py", line 165, in read_history_file
    self.mode._history.read_history_file(filename)
  File "C:\Users\Anaconda3\lib\site-packages\pyreadline\lineeditor\history.py", line 82, in read_history_file
    for line in open(filename, 'r'):
  File "C:\Users\Anaconda3\lib\encodings\cp1252.py", line 23, in decode
    return codecs.charmap_decode(input,self.errors,decoding_table)[0]
UnicodeDecodeError: 'charmap' codec can't decode byte 0x81 in position 2990: character maps to <undefined>

Answer 1

del %userprofile%\\.python_history删除了带有无法为我显示的字符的Python历史文件并解决了问题。