number « array « Python Data Type Q&A

1. Initializing a list to a known number of elements in Python    stackoverflow.com

Right now I am using a list, and was expecting something like:

verts = list (1000)

2. Sum numbers in an array    stackoverflow.com

I'm a Python newbie. At this site, they show how to sum list of integers. What if instead of a list of raw ints, you had a list of

class Number ...

3. Python: How do I convert an array of strings to an array of numbers?    stackoverflow.com

current array: ['1','-1','1'] desired array: [1,-1,1]

4. Python: what is the fastest / most elegant way to see if every number in two arrays is the same?    stackoverflow.com

ie, compare:

1,-1,1 

1.0,-1, 1

print("the input and the output are " + ( (input == calc_out) ? "the same" : "not the same"))

5. Sum one number to every element in a list (or array) in Python    stackoverflow.com

Here I go with my basic questions again, but please bear with me. In Matlab, is fairly simple to add a number to elements in a list:

a = [1,1,1,1,1]
b = a + ...

6. Divide number into digits and save them in list (array) using python    stackoverflow.com

I want to divide number into digits and save them in list (or array) in python. So firstly I should create list like

dig = [0 for i in range(10)]

i ...

7. Smaller Number in Array    python-forum.org

from timeit import Timer alist = [[5,5,3],[3,3,5],[3,3,3],[5,3,5],[5,5,5]] def low(obj): return min(sum(obj,[])) def low2(obj): return min([min(item) for item in obj]) def main(): l = Timer('low(alist)','from __main__ import alist,low') l2 = Timer('low2(alist)','from __main__ import alist,low2') for x in xrange(5): ...

8. Performing operations on numbers in an array    python-forum.org

import math import array print 'This is a reverse polish calculator, first enter how many number you are using, the numers, and then the operator.' num_array=[] num1 = input('How many numbers are you using: ') while num1 > 0: num2 = input('Enter a number: ') num1 = num1 - 1 ...