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import pathlib
p = pathlib.Path('adl://myblob.azuredatalakestore.net/local/abc/xyz')
s = str(p)
print(s)
what you expect s to be??
There is a bug in path.Path.str(conversion to string) and it remove a slash
s is 'adl:/myblob.azuredatalakestore.net/local/abc/xyz' <-- this is getting print....plz fix it

import pathlib
p = pathlib.Path('adl://myblob.azuredatalakestore.net/local/abc/xyz')
s = str(p)
print(s)
what you expect s to be??
There is a bug in path.Path.str(conversion to string) and it remove a slash
s is 'adl:/myblob.azuredatalakestore.net/local/abc/xyz' <-- this is getting print....plz fix it

pathlib is not designed to support URIs, so this behavior is not surprising. 
You want to use a different library, maybe urllib.

Thanks for the update Eric, if it is not designed to support URI it should tell to the user. It is very wired it just returns wrong data.
You can detect it very well if user has specified URI or not.

But that's a perfectly valid filename:
$ mkdir -p adl://myblob.azuredatalakestore.net/local/abc/xyz
$ ls -R adl:
'adl:':
myblob.azuredatalakestore.net/
'adl:/myblob.azuredatalakestore.net':
local/
'adl:/myblob.azuredatalakestore.net/local':
abc/
'adl:/myblob.azuredatalakestore.net/local/abc':
xyz/
'adl:/myblob.azuredatalakestore.net/local/abc/xyz':
The pathlib module isn't going to guess whether you passed it a filename or URI of some sort, especially when it's a valid filename. That's the caller's job to get right.
Removing the double slashes is a normal part of pathlib's behavior of normalizing paths, just as if you said from a bash shell "ls //etc//sysconfig", which will show the contents of "/etc/sysconfig". Although I'll admit I couldn't find this documented anywhere with a quick search.