Data Types

Built-in Data Types

MicroPython has the following data types:

  • Text Type: str

  • Numeric Types: int, float, complex

  • Sequence Types: list, tuple, range

  • Mapping Type: dict

  • Set Types: set, frozenset

  • Boolean Type: bool

  • Binary Types: bytes, bytearray, memoryview

Getting the Data Type

You can get the data type of any object by using the type() function:

a = 6.8
print(type(a))
>>> %Run -c $EDITOR_CONTENT
<class 'float'>

Setting the Data Type

MicroPython does not need to set the data type specifically, it has been determined when you assign a value to the variable.

x = "welcome"
y = 45
z = ["apple", "banana", "cherry"]

print(type(x))
print(type(y))
print(type(z))
>>> %Run -c $EDITOR_CONTENT
<class 'str'>
<class 'int'>
<class 'list'>
>>>

Setting the Specific Data Type

If you want to specify the data type, you can use the following constructor functions:

Example

Date Type

x = int(20)

int

x = float(20.5)

float

x = complex(1j)

complex

x = str(“Hello World”)

str

x = list((“apple”, “banana”, “cherry”))

list

x = tuple((“apple”, “banana”, “cherry”))

tuple

x = range(6)

range

x = dict(name=”John”, age=36)

dict

x = set((“apple”, “banana”, “cherry”))

set

x = frozenset((“apple”, “banana”, “cherry”))

frozenset

x = bool(5)

bool

x = bytes(5)

bytes

x = bytearray(5)

bytearray

x = memoryview(bytes(5))

memoryview

You can print some of them to see the result.

a = float(20.5)
b = list(("apple", "banana", "cherry"))
c = bool(5)

print(a)
print(b)
print(c)
>>> %Run -c $EDITOR_CONTENT
20.5
['apple', 'banana', 'cherry']
True
>>>

Type Conversion

You can convert from one type to another with the int(), float(), and complex() methods: Casting in python is therefore done using constructor functions:

  • int() - constructs an integer number from an integer literal, a float literal (by removing all decimals), or a string literal (providing the string represents a whole number)

  • float() - constructs a float number from an integer literal, a float literal or a string literal (providing the string represents a float or an integer)

  • str() - constructs a string from a wide variety of data types, including strings, integer literals and float literals

a = float("5")
b = int(3.7)
c = str(6.0)

print(a)
print(b)
print(c)

Note

You cannot convert complex numbers into another number type.