Using Joins to Combine Tables

When designing a database, it often makes sense to divide data between two or more tables. For example, if we are maintaining a database of patient records, we would probably want at least four tables one for the patient's personal information (such as their name date of birth), a second to keep track of their appointments, a third for information about the doctors who are treating them, and a fourth for information about the hospitals those doctors work in (see Figure 15.6, on the following...

Pixels and Colors

Most people want to do a lot more to pictures than just display them and crop them. If you do a lot of digital photography, you may want to remove the red-eye caused by your camera flash. You might also want to convert pictures to black and white for printing, highlight certain objects, and so on. To do these things, you must work with the individual pixels that make up the image. The media module represents pixels using the RGB color model discussed in the sidebar on page 72. Module media...

Images

Python Programming Madeleine

Now that we have seen the basic features of modules, objects, and methods, let's look at how they can solve real-world problems. For our running example, we will write some programs that display and manipulate pictures and other images. Suppose you have a file called pic207.jpg on your hard drive and want to display it on your screen. You could double-click to open it, but what does that actually do To start to answer that question, type the following into a Python prompt gt gt gt import media...

Write A For Loop To Read The Contents Of Alkaline Metals.txt And Store It In A Nested List With Each Element Of The

Here are some exercises for you to try on your own 1. Assign a list that contains the atomic numbers of the six alkaline earth metals beryllium 4 , magnesium 12 , calcium 20 , strontium 38 , barium 56 , and radium 88 to a variable called alkaline_earth_metals. 2. Which index contains Radium's atomic number Write the answer in two ways, one using a positive index and one using a negative index. 3. Which function tells you how many items there are in alkaline_ earth_metals 4. Write code that...