Understanding defer in Go. Deferred Function Calls A defer statement is an ordinary function or method call prefixed by the keyword defer. The function and argument expressions are evaluated when the statement is executed, but the actual call is def...

Closures and Anonymous Functions in Go. Anonymous Function A function literal is written like a function declaration, but without a name following the func keyword. It is an expression, and its value is called an anonymous function. package main ...

Working with Constants and iota in Go. The Constant Generator iota Here’s an example from the time package, which defines named constants of type Weekday for the days of the week, starting with zero for Sunday. Types of this kind are often called en...

Golang path and filepath Examples. Using filepath.Base The number is the index of the last slash in the string. If you want to get the file's base name, use filepath.Base: package main import ( "fmt" "path/filepath" ) func main() { path ...

In Golang, using the sort.Slice function is the easiest way to sort a slice Using Slice Function You simply pass an anonymous function to the sort.Slice function： package main import ( "fmt" "sort" ) func main() { s := []string{"Houston...

In Python, using the __file__ is the easiest way to get name of current script. Using Module Attributes You can use __file__ to get the name of the current file. When used in the main module, this is the name of the script that was originally invoke...

In Python, there are 2 ways to delete the contents of a folder. Using rmtree Method The shutil.rmtree() method deletes an entire directory tree; path must point to a directory. For example, #!/usr/bin/python3 # Import module import os, shutil ...

In Python, there are 2 ways to get the day of week given a date. Using weekday Method The weekday() method returns the day of the week as an integer, where Monday is 0 and Sunday is 6. The following example should cover whatever you are trying to ...

In Golang, there are 2 ways to change the current directory. Using Dir Property Usually if you need a command to run from a specific directory, you can specify that as the Dir property on the Command, for example: package main import ( "os/...

In Golang, using the Readdirnames function is the easiest way to check if directory on path is empty. Using Readdirnames Function The file.Readdirnames(n int) function reads the contents of the directory associated with file and returns a slice of ...

In Python, using the os.environ variable is the easiest way to set environment variables Using os.environ Variable os.environ behaves like a python dictionary, so all the common dictionary operations can be performed. In addition to the get and set ...

In Python, there are 2 ways to get a list of all subdirectories in the current directory. Using os.walk Function The os.walk() method generates the file names in a directory tree by walking the tree either top-down or bottom-up. The following examp...

In Python, there are 3 ways to get the system hostname. Using gethostname Method The socket.gethostname() method returns a string containing the hostname of the machine where the Python interpreter is currently executing. For example, #!/usr/bin...

In Python, there are 2 ways to retrieve a module's path. Using __file__ Attribute You can retrieve a module's path using the __file__ attribute. For example, #!/usr/bin/python3 # Import module import os print(os.__file__) /usr/local/lib/pyt...

In Python, there are 2 ways to get an absolute file path. Using abspath Function The os.path.abspath() method returns a normalized absolutized version of the pathname path. For example, #!/usr/bin/python3 # Import module import os abs = os.pat...