This page contains some examples of module examples in various programming languages.

A module is a piece of code that contains data and code to be shared and used by other code, as in a library.

Some issues arise in most language systems.

• How is the main code supposed to find the module code? Some path or lookup system is needed.
• How are multiple includes handled?
• How are modules or namespaces to be named?

It helps to have a standard naming practice for modules and namespaces. One way is to use the initials of the company. I tend to use my initials "rms" or "rs" as a prefix. This lets me know that this is one of my modules instead of some other module.

Some systems support hierarchical name spaces.

A Python module is a Python code file that acts as a name space.

The Python code file is included using the import statement.

Here is a code module in Python [module rmsTest in rmsTest.py].
# module rmsTest.py testVar1 = 123 def doTest1(): print("doTest1: called") print("init code for rmsTest goes here") print("(module rmsTest imported)")

The Python module is in a file called rmsTest.py. This file should be in the Python path. I normally put all of my Python files in one folder that is in that path.

Here is the Python code [#2]
import rmsTest from rmsTest import doTest1 print("(begin main)") rmsTest.doTest1() print("rmsTest.testVar1=[{0:d}]".format(rmsTest.testVar1)) print("(mid main)") doTest1() print("(end main)")
Here is the output of the Python code.
init code for rmsTest goes here (module rmsTest imported) (begin main) doTest1: called rmsTest.testVar1=[123] (mid main) doTest1: called (end main)

The import statement is used to import a module.

The import as statement can be used to import a module but with a different name.

The from import can be used to import names that then do not need the module prefix. Or asterisk "*" can be used to import all module routines.