Menu
Is it possible without loops initialize all list values to some bool? For example I want to have a list of N elements all False.
497
With * operator The * operator can repeat the same value required number of times. We use it to create a list with a Boolean value.
If you want to define a boolean in Python, you can simply assign a True or False value or even an expression that ultimately evaluates to one of these values. You can check the type of the variable by using the built-in type function in Python.
A boolean array can be created manually by using dtype=bool when creating the array. Values other than 0 , None , False or empty strings are considered True. Alternatively, numpy automatically creates a boolean array when comparisons are made between arrays and scalars or between arrays of the same shape.
A boolean list ("blist") is a list that has no holes and contains only true and false .
You can do it like this: -
>>> [False] * 10 [False, False, False, False, False, False, False, False, False, False] NOTE: - Note that, you should never do this with a list of mutable types with same value, else you will see surprising behaviour like the one in below example: -
>>> my_list = [[10]] * 3 >>> my_list [[10], [10], [10]] >>> my_list[0][0] = 5 >>> my_list [[5], [5], [5]] As you can see, changes you made in one inner list, is reflected in all of them.
181
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
