Examples of how to create a list of numbers in python using list comprehensions or built-in functions list(): Show Create a list of integersTo create a list of integers between 0 and N, a solution is to use the range(N) function: >>> l = [i for i in range(10)] >>> l [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] >>> l = list(range(10)) >>> l [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]To create a list of integers between N and M (with M>N), the function range() can still be used: >>> l = [i for i in range(25,35)] >>> l [25, 26, 27, 28, 29, 30, 31, 32, 33, 34] >>> l = list(range(25,35)) >>> l [25, 26, 27, 28, 29, 30, 31, 32, 33, 34]Create a list of floats using arangeTo create a list of floats between (N,M) with a given step, a solution is to use the numpy function called arange: >>> import numpy as np >>> l = [i for i in np.arange(2,8,0.5)] >>> l [2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5] >>> l = list(np.arange(2,8,0.5)) >>> l [2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5]Create a list of floats using linspaceTo create a list of floats between (N,M) with a given number of elementsa solution is to use the numpy function linspace: >>> import numpy as np >>> l = [i for i in np.linspace(12,16,8)] >>> l [12.0, 12.571428571428571, 13.142857142857142, 13.714285714285714, 14.285714285714285, 14.857142857142858, 15.428571428571429, 16.0] >>> l = list(np.linspace(12,16,8)) >>> l [12.0, 12.571428571428571, 13.142857142857142, 13.714285714285714, 14.285714285714285, 14.857142857142858, 15.428571428571429, 16.0]Create a list of random integersThe python function randint can be used to generate a random integer in a chosen interval [a,b]: >>> import random >>> random.randint(0,10) 7 >>> random.randint(0,10) 0A list of random numbers can be then created using python list comprehension approach: >>> l = [random.randint(0,10) for i in range(5)] >>> l [4, 9, 8, 4, 5]Another solution is to use randrange function (except that can specify a step if you need): >>> l = [random.randrange(0,10) for i in range(5)] >>> l [1, 7, 4, 3, 1] >>> l = [random.randrange(0,10,2) for i in range(5)] >>> l [2, 4, 4, 6, 0]A third solution is to create a list of random numbers with no repetition, is to use random.sample function >>> l = random.sample(range(1,100), 10) >>> l [89, 56, 87, 51, 46, 25, 52, 44, 10, 32]References |
