By Allen B. Downey

For you to how one can software, operating with Python is a superb method to commence. This hands-on consultant takes you thru the language a step at a time, starting with uncomplicated programming innovations ahead of relocating directly to services, recursion, facts buildings, and object-oriented layout. This moment variation and its aiding code were up to date for Python 3.

Through routines in each one bankruptcy, you'll test programming suggestions as you study them. imagine Python is perfect for college students on the highschool or collage point, in addition to self-learners, home-schooled scholars, and pros who have to examine programming fundamentals. newcomers simply getting their ft rainy will how to commence with Python in a browser.Start with the fundamentals, together with language syntax and semanticsGet a transparent definition of every programming conceptLearn approximately values, variables, statements, features, and knowledge constructions in a logical progressionDiscover how one can paintings with documents and databasesUnderstand items, tools, and object-oriented programmingUse debugging thoughts to mend syntax, runtime, and semantic errorsExplore interface layout, info constructions, and GUI-based courses via case reports

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Extra info for Think Python: How to Think Like a Computer Scientist (2nd Edition)

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There should be only two statements in the body of this function, not four. py. Exercise 3-3. Note: This exercise should be done using only the statements and other features we have learned so far. 1. Write a function that draws a grid like the following: + - - - - + - - - - + | | | | | | | | | | | | + - - - - + - - - - + | | | | | | | | | | | | + - - - - + - - - - + Exercises | 33 Hint: to print more than one value on a line, you can print a comma-separated sequence of values: print('+', '-') By default, print advances to the next line, but you can override that behavior and put a space at the end, like this: print('+', end=' ') print('-') The output of these statements is '+ -'.

A print statement with no argument ends the current line and goes to the next line. 2. Write a function that draws a similar grid with four rows and four columns. py. Credit: This exercise is based on an exercise in Oualline, Practical C Programming, Third Edition, O’Reilly Media, 1997. 34 | Chapter 3: Functions CHAPTER 4 Case Study: Interface Design This chapter presents a case study that demonstrates a process for designing func‐ tions that work together. It introduces the turtle module, which allows you to create images using turtle graphics.

42 | Chapter 4: Case Study: Interface Design docstring A docstring is a string at the beginning of a function that explains the interface (“doc” is short for “documentation”). Here is an example: def polyline(t, n, length, angle): """Draws n line segments with the given length and angle (in degrees) between them. t is a turtle. lt(angle) By convention, all docstrings are triple-quoted strings, also known as multiline strings because the triple quotes allow the string to span more than one line.

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