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This module explains the Python for loop and the Python range function

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

In the most recent modules you learned about the while loop, operators , and the if statement. While studying that material, you learned some other things as well such as theconcepts of repetition, modularity, and decision logic.

What you will learn

You will learn about the for loop and the range function in this module.

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 . Syntax of a for loop statement.
  • Figure 2 . Output from the code in Listing 2.

Listings

  • Listing 1 . Application of a for loop to a list and a string.
  • Listing 2 . Using the range function to control a for loop.

General background information

You learned about the while loop in the earlier module titled Itse1359-1210-The while Loop . Although the syntax of the while loop in Python is different from the syntax of the while loop in other programming languages such as C, C++, C#, and Java, the behavior is very similar.

You learned about the if statement in the earlier module titled Itse1359-1230-The if Statement . Once again, although the syntax of the if statement in Python is different from the syntax of the if statement in the other programming languages listed above, the behavior is verysimilar.

That brings us to the for loop in Python. Neither the syntax nor the behavior of the Python for loop is similar to the syntax or the behavior of the primary for loop in those other languages.

However, some of those other languages have added a secondary for loop in recent years with behavior that is similar to the Python for loop. Also, the range function can be used with a Python for loop to produce behavior that is similar to the behavior of the primary for loops in those other languages.

Discussion and sample code

Iterate on a sequence

Python's for loop statement iterates over the items of any sequence (such as a list or a string) , in the order that they appear in the sequence. The syntax of a for loop is shown in Figure 1 .

Figure 1 . Syntax of a for loop statement.
for var in sequence: statement(s)

The words " for " and " in " are keywords in the sequence. By that, I mean that they don't change from one script tothe next. The name of the variable var , the name of the sequence, and the statements are provided by the programmer and are subject to change from one script tothe next.

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
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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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