To handle larger amounts of data, we cannot invent a new variable for every new data item. Somehow we need to put more data into one variable. This is where Python lists come in.
Find out what each of the expressions does to the list in the center.
What does the list b contain?
a = [8, 7, 6, 5, 4]
b = a[2:4]
-
[7, 6, 5] -
[7, 6] -
[6, 5] -
[6, 5, 4]
Use the expressions to modify the list as indicated. Use each expression once.
Use the expressions to modify the list as indicated. Use each expression once.
In the year 2000, a total of 1962406 boys were registered born in the U.S. What percentage of the total names do the top 10 names consist?
Write a program to calculate that number.
| name | number |
|---|---|
| Jacob | 34465 |
| Michael | 32025 |
| Matthew | 28569 |
| Joshua | 27531 |
| Christopher | 24928 |
| Nicholas | 24650 |
| Andrew | 23632 |
| Joseph | 22818 |
| Daniel | 22307 |
| Tyler | 21500 |
If you are using Python2, you need to specify whether you want numbers with decimal places when dividing. That means
3 / 4
gives a different result than
3.0 / 4
However, Python 3 automatically creates the decimal places if needed.