<< Chapter < Page Chapter >> Page >
This module will teach you how to create empty tuples and tuples containing only one item.

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.

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 theFigures and the Listings while you are reading about them.

(Note to blind and visually impaired students: Most of the Figures and all of the Listings in this module are presented in plain text format and should be accessible using anaudio screen reader or a braille display.)

Figures

  • Figure 1 . Output from the code in Listing 1.
  • Figure 2 . Output from the code in Listing 2.
  • Figure 3 . Output from the code in Listing 3.
  • Figure 4 . Consolidated output from the program in Listing 4.
  • Figure 5 . Visualization of the tuples.

Listings

Introduction

This module is part of a series of modules designed to teach you about tuples in Python.

Previous modules have illustrated

  • How to create a tuple.
  • How to access a tuple item using indexing.
  • How to slice a tuple.
  • How to nest tuples.

This module will teach you how to create empty tuples and tuples containing only one item.

What is a tuple ?

A tuple is like a list whose values cannot be modified. It is an ordered list of objects, and it can contain references to any type of object.

  • Tuples are normally written as a sequence of items contained in (optional) matching parentheses.
  • A tuple is an immutable sequence.
  • Items in a tuple are accessed using a numeric index.
  • Tuples can be nested.

Sample Program

Empty, single-item, and nested tuples

Listing 4 shows a Python program that

  • Creates an empty tuple.
  • Creates a single-item tuple.
  • Nests the two tuples along with some strings in a third tuple.
  • Determines the length of each of the tuples.
  • Displays all of the above

A consolidated output from the program is shown in Figure 4 .

A visualization of the tuples in the program is provided in Figure 5 .

An empty tuple

I will explain this program in fragments. The beginning of the program is shown in Listing 1 .

Listing 1 . Beginning of the program.
# Illustrates empty tuples and tuples with only one element #----------------------------------------------------------print("Create and print empty tuple") t1 = ()print(t1) print("Length of empty tuple is")print(len(t1))

As you might have guessed from the name, an empty tuple is just a pair of empty parentheses as shown by the second statement in Listing 1 . (The parentheses aren't optional for an empty tuple.)

Questions & Answers

A golfer on a fairway is 70 m away from the green, which sits below the level of the fairway by 20 m. If the golfer hits the ball at an angle of 40° with an initial speed of 20 m/s, how close to the green does she come?
Aislinn Reply
cm
tijani
what is titration
John Reply
what is physics
Siyaka Reply
A mouse of mass 200 g falls 100 m down a vertical mine shaft and lands at the bottom with a speed of 8.0 m/s. During its fall, how much work is done on the mouse by air resistance
Jude Reply
Can you compute that for me. Ty
Jude
what is the dimension formula of energy?
David Reply
what is viscosity?
David
what is inorganic
emma Reply
what is chemistry
Youesf Reply
what is inorganic
emma
Chemistry is a branch of science that deals with the study of matter,it composition,it structure and the changes it undergoes
Adjei
please, I'm a physics student and I need help in physics
Adjanou
chemistry could also be understood like the sexual attraction/repulsion of the male and female elements. the reaction varies depending on the energy differences of each given gender. + masculine -female.
Pedro
A ball is thrown straight up.it passes a 2.0m high window 7.50 m off the ground on it path up and takes 1.30 s to go past the window.what was the ball initial velocity
Krampah Reply
2. A sled plus passenger with total mass 50 kg is pulled 20 m across the snow (0.20) at constant velocity by a force directed 25° above the horizontal. Calculate (a) the work of the applied force, (b) the work of friction, and (c) the total work.
Sahid Reply
you have been hired as an espert witness in a court case involving an automobile accident. the accident involved car A of mass 1500kg which crashed into stationary car B of mass 1100kg. the driver of car A applied his brakes 15 m before he skidded and crashed into car B. after the collision, car A s
Samuel Reply
can someone explain to me, an ignorant high school student, why the trend of the graph doesn't follow the fact that the higher frequency a sound wave is, the more power it is, hence, making me think the phons output would follow this general trend?
Joseph Reply
Nevermind i just realied that the graph is the phons output for a person with normal hearing and not just the phons output of the sound waves power, I should read the entire thing next time
Joseph
Follow up question, does anyone know where I can find a graph that accuretly depicts the actual relative "power" output of sound over its frequency instead of just humans hearing
Joseph
"Generation of electrical energy from sound energy | IEEE Conference Publication | IEEE Xplore" ***ieeexplore.ieee.org/document/7150687?reload=true
Ryan
what's motion
Maurice Reply
what are the types of wave
Maurice
answer
Magreth
progressive wave
Magreth
hello friend how are you
Muhammad Reply
fine, how about you?
Mohammed
hi
Mujahid
A string is 3.00 m long with a mass of 5.00 g. The string is held taut with a tension of 500.00 N applied to the string. A pulse is sent down the string. How long does it take the pulse to travel the 3.00 m of the string?
yasuo Reply
Who can show me the full solution in this problem?
Reofrir Reply
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get Jobilize Job Search Mobile App in your pocket Now!

Get it on Google Play Download on the App Store Now




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
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Itse 1359 introduction to scripting languages: python' conversation and receive update notifications?

Ask