This module represents generic o perating s ystem functionality. This module is especially important if you want to make your programs platform-independent i.e. it allows the program to be written such that it will run on Linux as well as Windows without any problems and without requiring changes. An example of this is using the os.sep variable instead of the operation system-specific path separator. Some of the more useful parts of the os module are listed below Most of them are self-explanatory. The os.name string specifies which platform you are using, such as 'nt' for Windows and 'posix' for Linux/Unix users. The os.getcwd() function gets the current working directory i.e. the path of the directory from which the curent Python script is working. The os.getenv() and os.putenv() functions are used to get and set environment variables respectively. The os.listdir() function returns the name of all files and directories in the specified di