Beginning Python - From Novice to Professional
Beginning Python - From Novice to Professional Beginning Python - From Novice to Professional
CHAPTER 4 ■ DICTIONARIES: WHEN INDICES WON’T DO 79 A Quick Summary In this chapter, you learned about the following: Mappings. A mapping enables you to label its elements with any immutable object, the most usual types being strings and tuples. The only built-in mapping type in Python is the dictionary. String formatting with dictionaries. You can apply the string formatting operation to dictionaries by including names (keys) in the formatting specifiers. When using tuples in string formatting, you need to have one formatting specifier for each element in the tuple. When using dictionaries, you can have fewer specifiers than you have items in the dictionary. Dictionary methods. Dictionaries have quite a few methods, which are called in the same way as list and string methods. New Functions in This Chapter Function dict(seq) Description Creates dictionary from (key, value) pairs What Now? You now know a lot about Python’s basic data types and how to use them to form expressions. As you may remember from Chapter 1, computer programs have another important ingredient—statements. They’re covered in detail in the next chapter.
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CHAPTER 4 ■ DICTIONARIES: WHEN INDICES WON’T DO 79<br />
A Quick Summary<br />
In this chapter, you learned about the following:<br />
Mappings. A mapping enables you <strong>to</strong> label its elements with any immutable object, the<br />
most usual types being strings and tuples. The only built-in mapping type in <strong>Python</strong> is the<br />
dictionary.<br />
String formatting with dictionaries. You can apply the string formatting operation <strong>to</strong><br />
dictionaries by including names (keys) in the formatting specifiers. When using tuples in<br />
string formatting, you need <strong>to</strong> have one formatting specifier for each element in the tuple.<br />
When using dictionaries, you can have fewer specifiers than you have items in the dictionary.<br />
Dictionary methods. Dictionaries have quite a few methods, which are called in the same<br />
way as list and string methods.<br />
New Functions in This Chapter<br />
Function<br />
dict(seq)<br />
Description<br />
Creates dictionary from (key, value) pairs<br />
What Now?<br />
You now know a lot about <strong>Python</strong>’s basic data types and how <strong>to</strong> use them <strong>to</strong> form expressions.<br />
As you may remember from Chapter 1, computer programs have another important ingredient—statements.<br />
They’re covered in detail in the next chapter.
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