Data Types
Python is a strongly typed language, in the sense that at runtime it prevents typing errors and it engages in little implicit type conversion or casting, i.e. converting one type to another without a specific call to a conversion function.
codecademy = 575codecademy = "575 broadway"
After line 1, codecademy
is an int
. After line 2, codecademy
is a str
.
Python includes the following categories of built-in data types:
- String type:
str
- Boolean type:
bool
- Binary types:
bytes
,bytearray
,memoryview
- Number types:
int
,float
,complex
- Sequence Types:
list
,range
,tuple
- Set types:
set
,frozenset
- Dictionary type:
dict
type()
The type()
function can be used to retrieve the data type of an object:
message = "Hello, world!"print(type(message))# Output: <class 'str'>
isinstance()
The isinstance()
function can be used to test if an object is an instance of a specified type. This will print a boolean value for each function call, indicating if the object is an instance of the given type:
word = "purple"languages = ("Python", "JavaScript", "Go")print(isinstance(word, str)) # Output: Trueprint(isinstance(languages, list)) # Output: Falseprint(isinstance(languages, tuple)) # Ouput: True