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This module explains how to tap into some of the more-powerful capabilities of Python functions using required arguments, default arguments, keyword arguments, and variable-length arguments.

Table of contents

Preface

This module is one in a collection of modules on Python designed for teaching ITSE 1359 Introduction to Scripting Languages: Python at Austin Community College in Austin, TX.

What you have learned

You learned the basics of defining and calling Python functions in the earlier module titled Itse1359-1270-Functions .

What you will learn

In this module, you will learn how to tap into some of the more-powerful capabilities of functions involving optional ways to use arguments. This willinclude an explanation of

  • required arguments,
  • default arguments,
  • keyword arguments, and
  • variable-length arguments.

Viewing tip

I recommend that you open another copy of this module in a separate browser window and use the following links to easily find and view the Figuresand the Listings while you are reading about them.

(Note to blind and visually impaired students: most of the Figures and all of the Listings inthis module are presented in plain text format and should be accessible using an audio screen reader or a braille display. Note however that the requiredindentation may not be properly represented by an audio screen reader.)

Figures

  • Figure 1 . Output from the code in Listing 1.
  • Figure 2 . Visualization of the code in Listing 1.
  • Figure 3 . Output from the code in Listing 2.
  • Figure 4 . Output produced by the code in Listing 3.
  • Figure 5 . Output produced by the code in Listing 4.
  • Figure 6 . Output produced by the code in Listing 5.
  • Figure 7 . Visualization of variable-length arguments.

Listings

  • Listing 1 . A list-modifier function.
  • Listing 2 . Another list-modifier function.
  • Listing 3 . Illustration of default arguments.
  • Listing 4 . Illustration of keyword arguments.
  • Listing 5 . Illustration of variable-length arguments.

General background information

The overall topic of function arguments in Python is broad and relatively complex. A complete treatment of the topic is beyond the scope of this collection of modules.Instead, I will provide some examples of what is possible. For a more compete treatment, I will refer you to The Python Tutorial -- More on Defining Functions and tutorialspoint -- Python Functions .

One of the fundamental concepts in computer programming is whether function parameters are passed by value or by reference . If a parameter is passed by value, the function receives a copy of the thing referred to by theparameter. Modifying that thing in the function will not modify the original.

Questions & Answers

Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
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are you nano engineer ?
s.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
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how to fabricate graphene ink ?
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for screen printed electrodes ?
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of graphene you mean?
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Graphene has a hexagonal structure
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I start with an easy one. carbon nanotubes woven into a long filament like a string
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I'm interested in nanotube
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what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
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In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
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anybody can imagine what will be happen after 100 years from now in nano tech world
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after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
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name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
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silver nanoparticles could handle the job?
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I'm interested in Nanotube
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this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
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Source:  OpenStax, Itse 1359 introduction to scripting languages: python. OpenStax CNX. Jan 22, 2016 Download for free at https://legacy.cnx.org/content/col11713/1.32
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