python for everybody assignment 12

Python for Everybody

Exercise 12.3, exercise 12.4, exercise 12.5.

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Coursera - Python for everybody - ex 5.2

For the following problem: Write a program that repeatedly prompts a user for integer numbers until the user enters done . Once 'done' is entered, print out the largest and smallest of the numbers. If the user enters anything other than a valid number catch it with a try/except and put out an appropriate message and ignore the number. Input Cases: Enter 7, 2, bob, 10, and 4 and match the output below.

My program is not correctly showing the ans. What is problem here?

Output: Invalid input, Maximum is 10, Minimum is 2.

• Suggestion: don't test only with the given sequence of inputs. Try a variety of test cases. For example, try entering only "done", try entering only one number, try entering only an invalid input, try entering numbers that only increase or decrease. When a test fails, fix the script for that case and then test some more. –  Dennis Sparrow Commented Jun 10, 2020 at 3:11
• 1 Your indentation is off, everything in the while loop should be indented from the while True statement –  Sam Commented Jun 10, 2020 at 3:48
• Looks to me like Maximum is 10, Minimum is 2 is correct, for 7, 2, bob, 10, 4. No? –  Sam Commented Jun 10, 2020 at 3:50
• given output section is only the expected output. but my given input does not showup like that. –  user3404895 Commented Jun 10, 2020 at 3:55

10 Answers 10

You are missing out few statements while printing the output. The following code worked for me.

Have verified and runs successfully.

• Your answer is good, but code-only answers are discouraged. Please edit it to include an explanation. –  Sylvester is on codidact.com Commented Jan 1, 2022 at 21:58

Try this code and thank me later

If you include elif statements, they won't be checked if the condition in the if statement is true, so if I had "elif smallest..." it would never be checked giving 'Minimus is none' as a result.

This is the only thing I could work out. Couldn't figure out how to keep largest and smallest at the value of none

Fellow coders; most of the above-provided codes are right. The problem is the browser. I used chrome and got a mismatch. I then run the same code using Microsoft edge and finally received "Grade updated on server." So use a different browser. thank me later.

• Your answer could be improved with additional supporting information. Please edit to add further details about your code. –  CreepyRaccoon Commented May 4, 2023 at 11:44

• I’m having trouble understanding your question, what exactly are you trying to ask? –  surftijmen Commented Dec 27, 2021 at 8:54

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• Table of Contents
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• Mixed-Up Code Questions
• Practice Problems - Advanced Regular Expressions
• Problem Bank for Practice Problems and Test Problems
• Introduction to Problem Types
• Practice Problems - Mixed-up Code
• Practice Problems - Write Code
• 12.1 Regular Expressions
• 12.2 Character Matching in Regular Expressions
• 12.3 Extracting Data Using Regular Expressions
• 12.4 Combining Searching and Extracting
• 12.5 Escape Character
• 12.6 Summary
• 12.7 Bonus section for Unix / Linux users
• 12.8 Debugging
• 12.9 Glossary
• 12.10 Multiple Choice Questions
• 12.11 Practice Problems - Regular Expressions
• 12.12 Mixed-Up Code Questions
• 12.13 Write Code Questions
• 12.14 Group Work: Regular Expressions (Regex)
• 12.15 Group Work: More Regular Expressions (Regex)
• 12. Regular Expressions" data-toggle="tooltip">
• 12.2. Character Matching in Regular Expressions' data-toggle="tooltip" >

12.1. Regular Expressions ¶

So far we have been reading through files, looking for patterns and extracting various bits of lines that we find interesting. We have been using string methods like split and find and using lists and string slicing to extract portions of the lines.

This task of searching and extracting is so common that Python has a very powerful library called regular expressions that handles many of these tasks quite elegantly. The reason we have not introduced regular expressions earlier in the book is because while they are very powerful, they are a little complicated and their syntax takes some getting used to.

Regular expressions are almost their own little programming language for searching and parsing strings. As a matter of fact, entire books have been written on the topic of regular expressions. In this chapter, we will only cover the basics of regular expressions. For more detail on regular expressions, see:

https://en.wikipedia.org/wiki/Regular_expression

https://docs.python.org/library/re.html

The regular expression library re must be imported into your program before you can use it. The simplest use of the regular expression library is the search() function. The following program demonstrates a trivial use of the search function.

This code uses regular expressions to print lines that contain “From:”.

We open the file, loop through each line, and use the regular expression search() to only print out lines that contain the string “From:”. This program does not use the real power of regular expressions, since we could have just as easily used line.find() to accomplish the same result.

11-9-2: Which of the following correctly imports the regex library?

• import regex
• The module name is not regex.
• import re.search()
• We are not importing a specific regex function.
• Correct! This is the proper way to import the regular expression library.
• import regular_expressions
• This is not the module name. It is much shorter.

The power of the regular expressions comes when we add special characters to the search string that allow us to more precisely control which lines match the string. Adding these special characters to our regular expression allow us to do sophisticated matching and extraction while writing very little code.

For example, the caret character is used in regular expressions to match “the beginning” of a line. We could change our program to only match lines where “From:” was at the beginning of the line as follows:

Using regular expressions to print lines that contain “From:” at the beginning of the line.

Now we will only match lines that start with the string “From:”. This is still a very simple example that we could have done equivalently with the startswith() method from the string library. But it serves to introduce the notion that regular expressions contain special action characters that give us more control as to what will match the regular expression.

11-9-4: Which lines will the following code print?

• Any line that contains a 'B'
• Regular expressions are case sensitive for individual characters.
• Any line containing a 'b'
• Correct! Since there is no ^ before the 'b', we are only looking at lines that contain the letter 'b'.
• Lines that start with the letter 'b'
• Since there is no ^, we are only looking for lines that contain 'b', not those that start with 'b'.
• Lines that contain 'B' or 'b'
• Regular expressions are case sensitive for individual characters, so it will only look for 'b'.

Construct a block of code that loops reading lines from a file, removes whitespace on the right of the line, and prints out any line starting with ‘Wolverines’.

Python for Everybody

The goal of this book is to provide an Informatics-oriented introduction to programming. The primary difference between a computer science approach and the Informatics approach taken in this book is a greater focus on using Python to solve data analysis problems common in the world of Informatics.

The sample code and data files for the book is here: Code Samples .

Other courses / web sites using this book

Book translations:

• Printed book on Amazon India (low-cost shipping within India thanks to Shroff Publishing )
• Kindle edition of the book
• Free: PDF , HTML , EPUB
• HTML with examples in Jupyter Notebooks from LibreTexts.org
• Download HTML in a ZIP (~6MB)
• Interactive HTML from Trinket.io
• Translated book, autograders, resources, and web site at https://es.py4e.com
• Github repo - Contributors: Juan Carlos Perez Castellanos , Juan Dougnac , Daniel Merino Echeverría , Jaime Bermeo Ramírez and Fernando Tardío .
• Free PDF , EPUB
• Book source on github , (Thanks to Alessandro Rossetti and Vittore Zen )
• Free: PDF , EPUB
• Book source on github and translation team (Thanks to Yuri Loia de Medeiros ).
• Polish verson of web site - py4e.pl
• HTML , PDF (format A4) , PDF (format for print) , EPUB , MOBI
• Github Repository
• Contributors: Andrzej Wójtowicz (Adam Mickiewicz University in Poznań, Poland)
• Greek version of the web site - gr.py4e.com
• Printed Book
• Free PDF (in progress): PDF
• Github repository
• Thanks to: Konstantia Kiourtidou
• Free: PDF Book
• Translation by: Electronics Go | Team members
• DMK Press is working on a commercial translation of the book and will provide a free PDF for this site when it is completed.
• Russian versions of the slides from Violetta Fomkina .
• Korean (commercial translation) 데이터를 다루며 배우는 파이썬
• Book source on github - (Thanks to Deng Luo)
• There is an in-China copy of the videos available at https://www.bilibili.com/video/av46649799

If you are insterested in starting a translation of the book, I have some instructions for getting started .

Chapters 2-10 are heavily adapted from the open book titled: " Think Python: How to Think like a Computer Scientist " by Allen B. Downey and Jeff Elkner . The Python 2 version of the book is still available.

Copyright Creative Commons Attribution 3.0 - Charles R. Severance

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this contains all the answers to the quizes and asssignments for "Programming for Everybody (Getting Started with Python)" on Coursera by the University of Michigan.

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