Serhiy Storchaka added the comment:

If stdin and stdout are attached to a terminal, input() uses the readline 
library (if it is available) for displaying the prompt and reading user input. 
This is the limitation of the readline library and Python C API that this works 
with null-terminated C strings. You also can't enter the null character.

UnicodeEncodingError is raised if the prompt contains characters not encodable 
with the stdout encoding. Consider ValueError raised if the prompt contains the 
null character as similar restriction.


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