Python check whether a Unicode codepoint is assigned or not-CodePudding

I am using Python 3 and I know all about hex, int, chr, ord, '\uxxxx' escape and '\U00xxxxxx' escape and Unicode has 1114111 codepoints...

My question is very simple: how can I check if a Unicode codepoint is a valid Unicode codepoint, a Unicode codepoint is a valid codepoint only if it is unambiguously mapped to a authoritatively defined character.

For example, codepoint 720 is a valid Unicode, it is 0x2d0 in hex, and U 02D0 points to ː:

In [135]: hex(720)
Out[135]: '0x2d0'

In [136]: '\u02d0'
Out[136]: 'ː'

And 888 is not a valid Unicode codepoint:

In [137]: hex(888)
Out[137]: '0x378'

In [138]: '\u0378'
Out[138]: '\u0378'

And 127744 is valid:

In [139]: chr(127744)
Out[139]: '