All technological notes.
Variables can store data of different types, and different types can do different things.
Python has the following data types built-in by default, in these categories:
4 built-in data types in Python used to store collections of data:
List is a collection which is ordered and changeable. Allows duplicate members.Dictionary is a collection which is ordered and changeable. No duplicate members.Tuple is a collection which is ordered and unchangeable. Allows duplicate members.Set is a collection which is unordered, unchangeable, and unindexed. No duplicate members.(but can remove and/or add items)| Categories | Built-in Data Type |
|---|---|
| Text Type | str |
| Numeric Types | int, float, complex |
| Boolean Type | bool |
| Binary Types | bytes, bytearray, memoryview |
| None Type | NoneType |
| Sequence Types | list, tuple, range |
| Mapping Type | dict |
| Set Types | set, frozenset |
In Python, the data type is set when you assign a value to a variable.
type() Function:
isinstance() Function:
# Text Type
print("\n--------str--------")
x = "Hello World" # str
print(x) # Hello World
print(type(x)) # <class 'str'>
print(isinstance(x, str)) # True
# Numeric Types
print("\n--------int--------")
x = 20 # int
print(x) # 20
print(type(x)) # <class 'int'>
print(isinstance(x, int)) # True
print("\n--------float--------")
x = 20.5 # float
print(x) # 20.5
print(type(x)) # <class 'float'>
print(isinstance(x, float)) # True
print("\n--------complex--------")
x = 1j # complex
print(x) # 1j
print(type(x)) # <class 'complex'>
print(isinstance(x, complex)) # True
# Sequence Types
print("\n--------list--------")
x = ["apple", "banana", "cherry"] # list
print(x) # ['apple', 'banana', 'cherry']
print(type(x)) # <class 'list'>
print(isinstance(x, list)) # True
print("\n--------tuple--------")
x = ("apple", "banana", "cherry") # tuple
print(x) # ("apple", "banana", "cherry")
print(type(x)) # <class 'tuple'>
print(isinstance(x, tuple)) # True
print("\n--------range--------")
x = range(6) # range
print(x) # range(0, 6)
print(type(x)) # <class 'range'>
print(isinstance(x, range)) # True
# Mapping Type
print("\n--------dict--------")
x = {"name": "John", "age": 36} # dict
print(x) # {'name': 'John', 'age': 36}
print(type(x)) # <class 'dict'>
print(isinstance(x, dict)) # True
# Set Types
print("\n--------set--------")
x = {"apple", "banana", "cherry"} # set
print(x) # {'cherry', 'banana', 'apple'}
print(type(x)) # <class 'set'>
print(isinstance(x, set)) # True
print("\n--------frozenset--------")
x = frozenset({"apple", "banana", "cherry"}) # frozenset
# frozenset({'cherry', 'apple', 'banana'})
print(x)
print(type(x)) # <class 'frozenset'>
print(isinstance(x, frozenset)) # True
# Boolean Type
print("\n--------bool--------")
x = True # bool
print(x) # True
print(type(x)) # <class 'bool'>
print(isinstance(x, bool)) # True
# Binary Types
print("\n--------bytes--------")
x = b"Hello" # bytes
print(x) # b'Hello'
print(type(x)) # <class 'bytes'>
print(isinstance(x, bytes)) # True
print("\n--------bytearray--------")
x = bytearray(5) # bytearray
print(x) # bytearray(b'\x00\x00\x00\x00\x00')
print(type(x)) # <class 'bytearray'>
print(isinstance(x, bytearray)) # True
print("\n--------memoryview--------")
x = memoryview(bytes(5)) # memoryview
print(x) # <memory at 0x0000017D55987DC0>
print(type(x)) # <class 'memoryview'>
print(isinstance(x, memoryview)) # True
# None Type
print("\n--------NoneType--------")
x = None # NoneType
print(x) # None
print(type(x)) # <class 'NoneType'>
# print(isinstance(x, NoneType)) # NameError: name 'NoneType' is not defined
print("\n--------str()--------")
x =str(2.5)
print(x) # 2.5
print(type(x)) # <class 'str'>
print("\n--------int()--------")
x =int("2")
print(x) # 2
print(type(x)) # <class 'int'>
print("\n--------float()--------")
x =float("2.5")
print(x) # 2.5
print(type(x)) # <class 'float'>
print("\n--------complex()--------")
x =complex("1j")
print(x) # 1j
print(type(x)) # <class 'complex'>
print("\n--------list()--------")
x =list(("apple", "banana", "cherry"))
print(x) # ['apple', 'banana', 'cherry']
print(type(x)) # <class 'list'>
print("\n--------tuple()--------")
x =tuple(["apple", "banana", "cherry"])
print(x) # ('apple', 'banana', 'cherry')
print(type(x)) # <class 'tuple'>
print("\n--------range()--------")
x =range(6)
print(x) #range(0, 6)
print(type(x)) # <class 'range'>
print("\n--------dict()--------")
x =dict(name="John", age=36)
print(x) #{'name': 'John', 'age': 36}
print(type(x)) # <class 'dict'>
print("\n--------set()--------")
x =set(("apple", "banana", "cherry"))
print(x) #{'apple', 'banana', 'cherry'}
print(type(x)) # <class 'set'>
print("\n--------frozenset()--------")
x =frozenset(("apple", "banana", "cherry"))
print(x) #frozenset({'banana', 'cherry', 'apple'})
print(type(x)) # <class 'frozenset'>
print("\n--------frozenset()--------")
x =frozenset(("apple", "banana", "cherry"))
print(x) #frozenset({'banana', 'cherry', 'apple'})
print(type(x)) # <class 'frozenset'>
print("\n--------bool()--------")
x =bool(5)
print(x) #True
print(type(x)) # <class 'bool'>
print("\n--------bytes()--------")
x =bytes(5)
print(x) #b'\x00\x00\x00\x00\x00'
print(type(x)) # <class 'bytes'>
print("\n--------bytearray()--------")
x =bytearray(5)
print(x) #bytearray(b'\x00\x00\x00\x00\x00')
print(type(x)) # <class 'bytearray'>
print("\n--------memoryview()--------")
x =memoryview(bytes(5))
print(x) #<memory at 0x000002ADF8767DC0>
print(type(x)) # <class 'memoryview'>