This question already has answers here:
How do I create an empty array and then append to it in NumPy?
(15 answers)
Closed 3 years ago.
I need to create an empty nd-array in python without zeros or ones functions looks like in c++ with this command for array 3*4 for integers:
int x[3][4]
Please help me
Numpy has a function for that. empty
Related
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Is there a simple way of having a python list containing a given type of object only
(2 answers)
Python Typed Array of a Certain Size
(2 answers)
Closed 27 days ago.
I am trying to initialize a list object in python that accepts only one data type, let's say that I want to make a list of integers in c++, I would write int list[] = {1,2,3};, what is the python equivalent of this?
This question already has answers here:
Python list vs. array – when to use?
(11 answers)
Array versus List<T>: When to use which?
(16 answers)
Closed 4 months ago.
I have values from 0-300, I must only project values >50 and <200,
I can do this with both List and Array but I am forced to use a Array for this task,
what is the exact difference between the two in terms on ability?
I was able to do it with both List and Array but still confused between the use of list if you can do the same thing with an Array
This question already has answers here:
How to convert string representation of list to a list
(19 answers)
Closed 3 years ago.
How do I convert string that looks like this:
['Point Target', 'Channeled']
To an actual List of elements (in this example, Point Target and Channeled)?
You could use eval("['Point Target', 'Channeled']").
But be careful if you get the list from an untrusted source as eval will evaluate everything that it gets. So don't use it e.g on unfiltered input from a webinterface.
This question already has answers here:
Slice a string in groovy
(3 answers)
Closed 6 years ago.
Given the following list:
a = [0,1,2,3,4,5]
In python I can do this:
a[2:4] which will get me [2,3]
Given that same list in groovy, is there a similar slicing mechanism I can use?
The answer is:
a[2..3]
another example would be if you wanted [1,2,3,4]:
a[1..4]
This question already has answers here:
How do I prepend to a short python list?
(7 answers)
Closed 6 years ago.
Recently I was learning python,and I want to use the function that is opposite of append() function.How can I use the function insert an element in the first position of the list.Thank you!
Prepend doesn't exist, but you can simply use the insert method:
list.insert(0, element)