“2.7.0_bf4fda703454”.split(“_”) gives a list of strings: This splits the string at every underscore. If you want it to stop after the first split, use “2.7.0_bf4fda703454”.split(“_”, 1). If you know for a fact that the string contains an underscore, you can even unpack the LHS and RHS into separate variables: An alternative is to use partition(). … Read more
If you don’t want to change the strings, then you could simply do When you do it like this you will allocate an array of two pointers to const char. These pointers will then be set to the addresses of the static strings “blah” and “hmm”. If you do want to be able to change the actual string content, … Read more
You want to include <string> and use std::string: But what you really need to do is get an introductory level book. You aren’t going to learn properly any other way, certainly not scrapping for information online.
Answer in one line: or even shorter starting with Python 3.6 using random.choices(): A cryptographically more secure version: see this post In details, with a clean function for further reuse: How does it work ? We import string, a module that contains sequences of common ASCII characters, and random, a module that deals with random … Read more
replace will replace all instances of a letter. All you need to do is use substring():
You can use the strpos() function which is used to find the occurrence of one string inside another one: Note that the use of !== false is deliberate (neither != false nor === true will return the desired result); strpos() returns either the offset at which the needle string begins in the haystack string, or … Read more
If you only have one reference to a string and you concatenate another string to the end, CPython now special cases this and tries to extend the string in place. The end result is that the operation is amortized O(n). e.g. used to be O(n^2), but now it is O(n). From the source (bytesobject.c): It’s … Read more
Using variables in if statements If you want to do something when they don’t match, replace = with !=. You can read more about string operations and arithmetic operations in their respective documentation. Why do we use quotes around $x? You want the quotes around $x, because if it is empty, your Bash script encounters … Read more
No, not quite. Firstly, there’s a slight difference in semantics. If a is null, then a.concat(b) throws a NullPointerException but a+=b will treat the original value of a as if it were null. Furthermore, the concat() method only accepts String values while the + operator will silently convert the argument to a String (using the … Read more
There is strtol which is better IMO. Also I have taken a liking in strtonum, so use it if you have it (but remember it’s not portable): You might also be interested in strtoumax and strtoimax which are standard functions in C99. For example you could say: Anyway, stay away from atoi: The call atoi(str) … Read more