On 2019-04-03 03:06, Stephan Hoyer wrote:
On Tue, Apr 2, 2019 at 5:43 PM Eric V. Smith <[email protected]
<mailto:[email protected]>> wrote:
PS: I really tried to find a way to use := in this example so I could
put the assignment inside the 'if' statement, but as I think Tim Peters
pointed out, without C's comma operator, you can't.
Conceivably cut_prefix could return None if not found. Then you could
write something like:
if (stripped := cut_prefix(line, "INFO>")) is not None:
print(f"control line {stripped!r}")
else:
print(f"data line {line!r}")
You could even drop "is not None" in many circumstances, if you know the
cut string will be non-empty. That's actually pretty readable:
if stripped := cut_prefix(line, "INFO>"):
print(f"control line {stripped!r}")
else:
print(f"data line {line!r}")
-1
Sometimes you just want to remove it if present, otherwise leave the
string as-is.
I wouldn't want to have to write:
line = line.lcut("INFO>") or line
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