Eric V. Smith <e...@trueblade.com> added the comment:

>From the documentation of IPv4Address:

The following constitutes a valid IPv4 address:

1. A string in decimal-dot notation, consisting of four decimal integers in the 
inclusive range 0–255, separated by dots (e.g. 192.168.0.1). Each integer 
represents an octet (byte) in the address. Leading zeroes are tolerated only 
for values less than 8 (as there is no ambiguity between the decimal and octal 
interpretations of such strings).

21 is not less than 8, so you get this error. I think this is working as it's 
documented.

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nosy: +eric.smith

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<https://bugs.python.org/issue35820>
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