It says zero or even more prevalence of whitespace people, accompanied by a comma and then followed by zero or maybe more event of whitespace figures.
People two replaceAll calls will normally make the exact same end result, no matter what x is. Even so, it is crucial to note the two regular expressions are certainly not the identical:
In some code that I've to maintain, I've noticed a structure specifier %*s . Can anyone tell me what This is certainly and why it truly is utilized?
5 @powersource97, %.*s means that you are looking at the precision worth from an argument, and precision is the most variety of people to get printed, and %*s you're examining the width worth from an argument, which is the bare minimum number os figures to generally be printed.
That is fairly common mistake-examining code for any Python script that accepts command-line arguments.
The real difference lies in how it get's dealt with. Should you would have a gaggle of (such as) 3 spaces instantly pursuing each other s+ takes that team and turns The entire here it right into a "", when s would proces every single Area By itself.
cnicutarcnicutar 182k2626 gold badges376376 silver badges398398 bronze badges Increase a comment
And because your second parameter is empty string "", there's no difference between the output of two scenarios.
How do I stay away from Functioning extra time as a result of adolescents's lack of preparing without harming them too poorly?
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The width just isn't specified in the structure string, but as an additional integer benefit argument previous the argument that needs to be formatted.
If the worth to get output is under four character positions extensive, the worth is correct justified in the sphere by default.
If the worth is greater than 4 character positions large, the field width expands to accommodate the right number of figures.
So the initial if statement interprets to: if you have not handed me an argument, I will let you know how you ought to pass me an argument in the future, e.g. you will see this on-display screen: