Python List Data Structure

A Python List Data Structure is a Python array data structure that is a Python built-in data structure.

• Context:
  • It can be an input to an List-input Python Subroutine, such as a Python Join Subroutine.
  • It can be an input to a Python List Operation, such as a Python List Join.
  • It can range from being a One-Dimensional Python List to being a Multi-Dimensional Python List (such as a two-dimensional Python list)
• Example(s):
  • list1 = ['physics', 'chemistry', 1997, 2000] ;
  • personList = [] ;
personList.append(Person("Payne Pinar", "coach")) ;
print personList[0].name ;
  • a Python List Comprehension, such as: squares = [x**2 for x in range(10)] ;
  • a Python List of Tuples for a tuple data structure, such as:
    LoT = [(0,'a'), (1,'b'), (2,'c')]
  • a Python List Vector for a vector data structure.
  • a Python List of Lists (Python Matrix), such as:
    LoL = [[1,2,3,4,5],[1,2,3,4,5],[1,2,3,4,5]]
  • a Python List of Dictionaries.
  • …
• Counter-Example(s):
  • a numpy.Array.
  • a pandas.DataFrame.
  • a Python Associative Array.
  • a Perl Array (e.g. a Perl array of arrays).
• See: Python Coding Example, Python List Comprehension.

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References

2016

• https://docs.python.org/3/tutorial/datastructures.html#more-on-lists
  • QUOTE: The list data type has some more methods. Here are all of the methods of list objects:
    • list.append(x)
      Add an item to the end of the list. Equivalent to a[len(a):] = [x].
    • list.extend(L)
      Extend the list by appending all the items in the given list. Equivalent to a[len(a):] = L.
    • …

2013

• (Melli, 2013-05-21) ⇒ Gabor Melli. (2013). “Python Array Examples."

Populate manually

Matrix = [[0 for x in xrange(5)] for y in xrange(6)] 
Matrix[4][3] = 99
Matrix

xx =  numpy.array([2, 4, -11])
yy = zeros(3, Int)        # Create empty array ready to receive result

Populate from a file.

Loops

for i in range(0, 3):
  Matrix[i] = i * 2
print yy
#    [4   8 -22]

Transforming into a string

Emptying

Random

import random;
#Generate 1000 random integer numbers which are between 1 and 9999(included).
Z=random.sample(range(1,9999),1000);
type(Z)

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