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Globbing. By using the double asterisk (**), you are using a glob to list files on a filesystem. A glob is a string of literal or wildcard characters used for matching the file paths. Using one or more globs for locating files on a filesystem is called globbing. Apart from Linux shells, globbing is also used in various configuration files to ...
Aug 31, 2008 · What does ** (double star) and * (star) do for parameters? They allow for functions to be defined to accept and for users to pass any number of arguments, positional (*) and keyword (**). Defining Functions *args allows for any number of optional positional arguments (parameters), which will be assigned to a tuple named args.
May 27, 2010 · A single star * unpacks a sequence or collection into positional arguments. Suppose we have. def add(a, b): return a + b values = (1, 2) Using the * unpacking operator, we can write s = add(*values), which will be equivalent to writing s = add(1, 2). The double star ** does the same thing for a dictionary, providing values for named arguments:
Jun 2, 2014 · I've seen some code, as well as some errors generated from my compiler that have a '**' token before the variable (eg **variablename unreferenced-- or something, I can't recall exactly offhand).
From the Python 3 docs: The power operator has the same semantics as the built-in pow () function, when called with two arguments: it yields its left argument raised to the power of its right argument. The numeric arguments are first converted to a common type, and the result is of that type. It is equivalent to 2 16 = 65536, or pow(2, 16) Just ...
The globbing is not just limited to Java. It's also used for matching files in various configuration files, such as listing ignored files and directories in .gitignore in Git, selecting files and folders in Unix operating system, e.g ls **/*.java etc. Following are some of the most important parts of globbing.
Jul 25, 2020 · 33. The double asterisks are placeholders or instructions to the recursive interpreter to go through the files and folders. It is a simple, recursive wildcard while only one asterisk means all without recursion. '**/*.js'; All files with the extension .js from here onwards.
Aug 11, 2018 · 7. As reported in the note section of the R Documentation of Arithmetic Operators (you ca open it executing in R the commands help('**') or ?'**') ** is translated in the parser to ^, but this was undocumented for many years. It appears as an index entry in Becker et al (1988), pointing to the help for Deprecated but is not actually mentioned ...
Dec 17, 2014 · In C, a double star is a pointer to a pointer. There are a couple of reasons to do this. First is that the pointer might be to an array of pointers. Another reason would be to pass a pointer to a function, where the function modifies the pointer (similar to an "out" parameter in other languages).
Dec 26, 2010 · In this case, aPointer is a pointer to a pointer to char; if we want to get to the character value it's currently pointing to, we would have to dereference it twice: c = **aPointer; So, going by the logic above, the declaration of the pointer variable aPointer is. char **aPointer; because the type of the expression **aPointer is char.
