Learn to Program with Python by Irv Kalb

By Irv Kalb

Get begun on the earth of software program improvement: pass from 0 wisdom of programming to very easily writing small to medium-sized courses in Python. Programming will be intimidating (especially whilst such a lot books on software program require you to grasp and use imprecise command line directions) however it doesn’t must be that way!

In Learn to application with Python, writer Irv Kalb makes use of his in-person educating event to steer you thru studying the Python computing device programming language. He makes use of a conversational variety to make you're feeling as if he's your individual instruct. All fabric is specified by a considerate demeanour, every one lesson construction on earlier ones. Many real–world analogies make the fabric effortless to narrate to. a wide selection of well-documented examples are supplied. alongside the way in which, you’ll advance small courses by yourself via a sequence of coding demanding situations that make stronger the content material of the chapters.

What you'll research:

  • Learn basic programming suggestions together with: variables and task statements, services, conditionals, loops, lists, strings, dossier enter and output, net information, and knowledge structures
  • Get pleased with the loose IDLE Interactive improvement atmosphere (IDE), which you may use to write down and debug your entire Python code - little need to exploit the command line!
  • Build text-based courses, together with a couple of uncomplicated games
  • Learn tips to re-use code by means of construction your individual modules
  • Use Python's integrated facts constructions and programs to symbolize and utilize advanced information from the Internet

Who this publication is for:This e-book assumes that you've completely no past wisdom approximately programming. there is not any have to examine or use any imprecise Unix instructions. scholars of any age who've had no publicity to programming and have an interest in studying to do software program improvement within the Python language. The ebook can be utilized as a textual content publication linked to a highschool or university advent to desktop technology direction. Secondly, those who have had publicity to a few machine language except Python, who want to construct solid conduct for programming in Python.

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Example text

5. Typically, raw_input is used on the right side of an assignment statement. The user’s response is stored into the variable on the left-hand side of the equals sign. In the preceding example, as a favorite color, let’s say that the user entered purple. The variable favoriteColor is given the value of the string 'purple'. favoriteColor is a string variable, because anything the user types is a string of characters. 38 CHAPTER 3 ■ BUILT-IN FUNCTIONS That works great for this example asking for a favorite color.

Here is another example. Assume that you have not used a variable named xyz, and you try to use this variable in a line like this: print xyz or y = xyz + 1 These are valid Python statements, but since xyz was not defined before running these lines, Python gives you the following error message: Traceback (most recent call last): File "", line 1, in print xyz NameError: name 'xyz' is not defined The wording of the last line of this error message is very clear. When you see this type of error, you have most likely misspelled or mis-capitalized a variable name.

You should see these identical results: Total amount is 13 Finally, let’s modify the program to allow us to count the ten-dollar bills and the twenty-dollar bills in the wallet. nTwentyDollarBills = 5 nTenDollarBills = 4 nFiveDollarBills = 8 nOneDollarBills = 2 total = (nTwentyDollarBills * 20) + (nTenDollarBills * 10) + \ (nFiveDollarBills * 5) + nOneDollarBills print 'Total amount is', total 29 CHAPTER 2 ■ VARIABLES AND ASSIGNMENT STATEMENTS Notice that the line got a little long in the assignment statement that does the calculation.

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