Convert List Items To Int – Python
Convert List Items To Int – Python

To convert a list of floats to a list of integers:

`int()class to convert the current float to an integer.`

`list_of_floats = [1.23, 3.45, 5.67] result = [int(item) for item in list_of_floats] print(result) # 👉️ [1, 3, 5]`

We used a list comprehension to iterate over the list of floats.

On each iteration, we pass the current float value to the int class to convert it to an integer.

The new list only contains integer values.

You can also use the `round()` function to round each float to the nearest
integer.

`list_of_floats = [1.23, 3.45, 5.67] result = [round(item) for item in list_of_floats] print(result) # 👉️ [1, 3, 6]`

The round function takes the following 2 parameters:

 Name Description the number to round to the number of digits after the decimal, the number should have after the operation (optional)

The `round` function returns the number rounded to `ndigits` precision after the
decimal point.

If `ndigits` is omitted, the function returns the nearest integer.

`print(round(3.45)) # 👉️ 3 print(round(3.55)) # 👉️ 4`

If you need to round up, use the `math.ceil()` method.

`import math list_of_floats = [1.23, 3.45, 5.67] result = [math.ceil(item) for item in list_of_floats] print(result) # 👉️ [2, 4, 6]`

The math.ceil method returns the smallest integer greater than or equal to the provided number.

`print(math.ceil(3.01)) # 👉️ 4 print(math.ceil(3.99)) # 👉️ 4`

If you need to round down, use the `math.floor()` method.

`import math list_of_floats = [1.23, 3.45, 5.67] result_4 = [math.floor(item) for item in list_of_floats] print(result_4) # 👉️ [1, 3, 5]`

The math.floor method returns the largest integer less than or equal to the provided number.

`print(math.floor(4.999)) # 👉️ 4 print(math.floor(4.001)) # 👉️ 4`

Alternatively, you can use the `map()` function.

`map()`

This is a three-step process:

`round()function and the list to the`
`map()function.`
`map()function will pass each float to the`
`round()function.`
`list()class to convert the`
`mapobject to a list.`

`list_of_floats = [2.4, 3.5, 6.7, 8.1] new_list = list(map(round, list_of_floats)) # 👇️ [2, 4, 7, 8] print(new_list)`

The map() function takes a function and an iterable as arguments and calls the function with each item of the iterable.

`map()function calls the`
`round()function will each floating-point number in the list and rounds each value.`

The last step is to use the `list()` class to convert the `map` object to a
list.

The `list()` class takes an iterable and returns a list object.

Which approach you pick is a matter of personal preference. I’d go with the list comprehension as I find it more direct and easier to read.

To convert a list of integers to a list of floats:

`float()class to convert each integer to a float.`

`list_of_integers = [3, 5, 7, 9] new_list = [float(item) for item in list_of_integers] # 👇️ [3.0, 5.0, 7.0, 9.0] print(new_list)`

We used a list comprehension to iterate over the list of integers.

On each iteration, we pass the integer to the float() class to convert it to a floating-point number.

The new list will only contain float values.

Alternatively, you can use the `map()` function.

This is a three-step process:

`float()class and the list to the`
`map()function.`
`map()function will call the`
`float()class with each item in the list.`
`list()class to convert the`
`mapobject to a list.`

`list_of_integers = [3, 5, 7, 9] new_list = list(map(float, list_of_integers)) # 👇️ [3.0, 5.0, 7.0, 9.0] print(new_list)`

The `map()` function takes a function and an iterable as arguments and calls the
function with each item of the iterable.

`float()class gets passed each integer in the list and converts each value to a floating-point number.`

Lastly, we used the `list()` class to convert the `map` object to a list.

The `list()` class takes an iterable and returns a list object.

`forloop`

You can also use a for loop to convert a list of integers to a list of floats.

`list_of_integers = [3, 5, 7, 9] new_list = [] for item in list_of_integers: new_list.append(float(item)) print(new_list) # 👉️ [3.0, 5.0, 7.0, 9.0]`

On each iteration of the `for` loop, we convert the current item to a
floating-point number and append the result to a new list.

This is a two-step process:

`numpy.array()method.`

`import numpy as np list_of_integers = [3, 5, 7, 9] new_list = list( np.array(list_of_integers, dtype=np.float32) ) # 👇️ [3.0, 5.0, 7.0, 9.0] print(new_list)`

You can install NumPy by running the following command.

`pip install numpy # 👇️ or with pip3 pip3 install numpy`

The numpy.array method creates an array from the provided object.

`dtypeargument to`
`np.float32to specify the desired data type for the elements in the array.`

The last (optional) step is to use the `list()` class to convert the NumPy array
to a list object.

The `list()` class takes an iterable and returns a list object.