The 's' replaces a single Room match at a time even so the 's+' replaces The full Room sequence simultaneously with the next parameter.
In cases like this, it makes no variation, because you are changing every little thing having an empty string (Though It could be better to work with s+ from an effectiveness standpoint). In the event you have been changing with a non-empty string, The 2 would behave in another way. Share Strengthen this answer Stick to
In a few code that I've to keep up, I've viewed a format specifier %*s . Can any one notify me what This can be and why it's made use of?
Employing %s in scanf with out an explcit subject width opens exactly the same buffer overflow exploit that will get did; specifically, if you will find additional people within the input stream in comparison to the target buffer is sized to hold, scanf will happily create People excess people to memory outside the buffer, possibly clobbering anything significant. Regretably, in contrast to in printf, you here can't source the field with like a run time argument:
This is certainly relatively conventional error-checking code for your Python script that accepts command-line arguments.
The real difference lies in the best way it get's dealt with. Should you would have a gaggle of (such as) three spaces instantly pursuing each other s+ requires that group and turns the whole it right into a "", when s would proces just about every Room on its own.
And because your 2nd parameter is empty string "", there isn't a distinction between the output of two conditions.
Andrew HareAndrew Hare 351k7575 gold badges645645 silver badges641641 bronze badges three fifteen Be aware that this type of string interpolation is deprecated in favor of the more effective str.structure strategy.
See also that I am utilizing a tuple in this article too (after you only have a single string utilizing a tuple is optional) For example that several strings is often inserted and formatted in a single assertion.
How do I stay away from Doing work time beyond regulation as a consequence of young people's lack of planning with out harming them as well badly?
Within an eclipsing binary orbited by an Earth like planet, would the drops in brightness be recognizable?
This way it could stand By itself. Supplying an instance that was akin to the instance from the dilemma would even be a plus.
The next if assertion checks to discover if the 'databases-name' you handed on the script truly exists around the filesystem. Otherwise, you'll get a information such as this: