It states zero or maybe more occurrence of whitespace figures, followed by a comma after which followed by zero or more occurrence of whitespace characters.
In such a case, it helps make no difference, since you are changing everything using an empty string (Despite the fact that It will be far better to work with s+ from an performance standpoint). In the event you ended up changing which has a non-vacant string, The 2 would behave differently. Share Increase this remedy Follow
In some code that I have to maintain, I have noticed a structure specifier %*s . Can any person tell me what This is often and why it can be utilised?
Using %s in scanf with no an explcit field width opens the exact same buffer overflow exploit that receives did; particularly, if you will find far more people within the input stream in comparison to the concentrate on buffer is sized to carry, scanf will Fortunately create People excess people to memory outside the buffer, possibly clobbering anything vital. Unfortunately, as opposed to in printf, you can't supply the field with as being a operate time argument:
The rationalization behind the code if i'm working with %s rather than %c in my printf part of your code 82
Working with scanf Together with the %s conversion specifier will cease scanning at the very first whitespace character; for example, If the input stream appears like
The width is not really specified in website the structure string, but as an additional integer worth argument previous the argument that has to be formatted.
The %s token enables me to insert (and perhaps structure) a string. Notice that the %s token is changed by whatever I go towards the string after the % image.
The PEP will not say "supplanted" As well as in no Component of the PEP does it say the % operator is deprecated (yet it does say other points are deprecated down the bottom). You might want str.format and that is good, but right until there's a PEP indicating it really is deprecated there's no feeling in claiming it truly is when it's not.
Recognize also that i'm employing a tuple right here in addition (once you have only a person string using a tuple is optional) As an example that multiple strings could be inserted and formatted in one assertion.
The width isn't laid out in the structure string, but as an extra integer value argument previous the argument that needs to be formatted.
If the worth being output is below 4 character positions large, the value is true justified in the field by default.
If the value is bigger than 4 character positions extensive, the sphere width expands to accommodate the suitable range of characters.
So the primary if assertion translates to: should you haven't passed me an argument, I'll show you how you should go me an argument Down the road, e.g. you will see this on-display: