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Python 101 by Michael Driscoll

Posted On March 23, 2017 at 8:22 am by / Comments Off on Python 101 by Michael Driscoll

By Michael Driscoll

How one can software with Python three from starting to finish.

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You will probably find the list comprehension the most useful at first and also the most popular. If you start using your imagination, I am sure you will be able to find uses for all three types of comprehensions. Now we’re ready to move on and learn about exception handling! Chapter 7 - Exception Handling What do you do when something bad happens in your program? Let’s say you try to open a file, but you typed in the wrong path or you ask the user for information and they type in some garbage.

It tells Python that you may be inserting text soon. If you follow the string with a percent sign and another string or variable, then Python will attempt to insert it into the string. You can insert multiple strings by putting multiple instances of %s inside your string. You’ll see that in the last example. Just note that when you insert more than one string, you have to enclose the strings that you’re going to insert with parentheses. Now let’s see what happens if we don’t insert enough strings: 1 2 3 4 >>> another_string = "I like %s and %s" % "Python" Traceback (most recent call last): File "", line 1, in TypeError: not enough arguments for format string Oops!

This is the default mode of the open function. Note that we didn’t pass a fully qualified path to the file that we wanted to open in the first example. txt. If it doesn’t find it, then you will receive an IOError. The second example does show a fully qualified path to the file, but you’ll notice that it begins with an “r”. This means that we want Python to treat the string as a raw string. txt As you can see, when we don’t specify it as a raw string, we get an invalid path. Why does this happen?

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