Head First Programming A Learner`s Guide to Programming Using the Python Language [PB,2009]

Head First Programming A Learner`s Guide to Programming Using the Python Language [PB,2009]

Language: English

Pages: 0

ISBN: B004C7CXRK

Format: PDF / Kindle (mobi) / ePub


Head First Programming: A Learner's Guide to Programming Using the Python Language by David Griffiths. O'Reilly & Associates, Inc.,2009

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feedback. What else will you need? you are here 4   11 code is a highway You needed to decide what messages should be displayed to the user. Below is a table showing some typical values the user might enter. What did you think the message should say? Program Modif ication Number en tered 3 5 7 8 Message to display Too low You win! Too high Too high A program is more than a list of commands You could create a program that was simply a list of commands. But you almost never will. This is

import urllib.request page = urllib.request.urlopen(“http://www.beans-r-us.biz/prices.html") text = page.read().decode(“utf8") Search for the index locati of the “>$" combination. on This is the addition operator. The start of the actual price is another 2 index positions along the string, while the end of the price is another 4. where = text.find(‘>$') start_of_price = where + 2 end_of_price = start_of_price + 4 price = text[start_of_price:end_of_price] print(price) Did you remember to print

end_of_price print ("Buy!") 4.74: while price > page = urllib.request.urlopen("http://www.beans-r-us.biz/prices.html") you are here 4   61 Code Magnets Solution The program code to add the feature was sitting on the fridge door. You were asked to arrange the magnets so that the program loops until the price falls to $4.74 or lower. import urllib.request price = 99.99 while price > 4.74: page = urllib.request.urlopen("http://www.beans-r-us.biz/prices.html") Did you remember to indent

first. import urllib.request price = 99.99 while price > 4.74: page = urllib.request.urlopen("http://www.beans-r-us.biz/prices.html") text = page.read().decode("utf8") where = text.find('>$') start_of_price = where + 2 end_of_price = start_of_price + 4 price = float(text[start_of_price:end_of_price]) print ("Buy!") you are here 4   71 time is on our side These are some of the functions provided by Python’s built-in time library: tion: time Python Library Documenta floating time.clock()

to show you everything you might possibly need to know. So, here’s our list of the top ten things we didn’t cover that you might want to learn more about next. #1: Doing things “The Python Way” 386 #2: Using Python 2 387 #3: Other programming languages 388 #4: Automated testing techniques 389 #5: Debugging 390 #6: Command-line execution 391 #7: Ooops... we could’ve covered more OOP 392 #8: Algorithms 393 #9: Advanced programming topics 394 #10: Other IDEs, shells and

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