By Shaw Z.
Examine Python The challenging means is a booklet I wrote to coach programming to those that don't know how you can code. It assumes you're most likely an influence person of your machine, after which takes you from not anything to programming basic video games. After analyzing my ebook try to be prepared for plenty of of the opposite programming books available in the market.
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Line 7 we print a little line, but on line 8 we have something very new and exciting. We call a function on txt. What you got back from open is a file, and it’s also got commands you can give it. You give a file a command by using the . (dot or period), the name of the command, and parameters. Just like with open and raw_input. read() you are saying, “Hey txt! ” The remainder of the file is more of the same, but we’ll leave the analysis to you in the extra credit. txt” and ran my script. txt': This is stuff I typed into a file.
Research the shorthand notation += and rewrite the script to use that. 52 Exercise 20: Functions And Files Exercise 21: Functions Can Return Something You have been using the = character to name variables and set them to numbers or strings. We’re now going to blow your mind again by showing you how to use = and a new Python word return to set variables to be a value from a function. " 19 20 21 22 23 age = add(30, 5) height = subtract(78,4) weight = multiply(90, 2) iq = divide(100, 2) 24 25 print "Age: %d, Height: %d, Weight: %d, IQ: %d" % (age, height, weight, iq) 26 27 28 29 # A puzzle for the extra credit, type it in anyway.
7. Startup python again and use open from the prompt. Notice how you can open files and run read on them right there? 8. Have your script also do a close() on the txt and txt_again variables. It’s important to close files when you are done with them. 40 Exercise 15: Reading Files Exercise 16: Reading And Writing Files If you did the extra credit from the last exercise you should have seen all sorts of commands (methods/functions) you can give to files. Here’s the list of commands I want you to remember: • close – Closes the file.