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      Join Arrays

      Python Tutorial

      This Python tutorial has been written for the beginners to help them understand the basic to advanced concepts of Python Programming Language. After completing this tutorial, you will find yourself at a great level of expertise in Python, from where you can take yourself to the next levels to become a world class Software Engineer.

      Join Arrays

      In Python, array is a homogenous collection of Python's built in data types such as strings, integer or float objects. However, array itself is not a built-in type, instead we need to use the array class in Python's built-in array module.

      First Method

      To join two arrays, we can do it by appending each item from one array to other.
      Here are two Python arrays
      a = arr.array('i', [10,5,15,4,6,20,9])
      b = arr.array('i', [2,7,8,11,3,10])
      Run a for loop on the array "b". Fetch each number from "b" and append it to array "a" with the following loop statement
      for i in range(len(b)):
         a.append(b[i])
      The array "a" now contains elements from "a" as well as "b".
      Here is the complete code
      import array as arr
      a = arr.array('i', [10,5,15,4,6,20,9])
      b = arr.array('i', [2,7,8,11,3,10])
      for i in range(len(b)):
         a.append(b[i])
      print (a, b)
      It will produce the following output
      array('i', [10, 5, 15, 4, 6, 20, 9, 2, 7, 8, 11, 3, 10])

      Second Method

      Using another method to join two arrays, first convert arrays to list objects
      a = arr.array('i', [10,5,15,4,6,20,9])
      b = arr.array('i', [2,7,8,11,3,10])
      x=a.tolist()
      y=b.tolist()
      The list objects can be concatenated with the '+' operator.
      z=x+y
      If "z" list is converted back to array, you get an array that represents the joined arrays 
      a.fromlist(z)
      Here is the complete code
      from array import array as arr
      a = arr.array('i', [10,5,15,4,6,20,9])
      b = arr.array('i', [2,7,8,11,3,10])
      x=a.tolist()
      y=b.tolist()
      z=x+y
      a=arr.array('i')
      a.fromlist(z)
      print (a)

      Third Method

      We can also use the extend() method from the List class to append elements from one list to another.
      First, convert the array to a list and then call the extend() method to merge the two lists
      from array import array as arr
      a = arr.array('i', [10,5,15,4,6,20,9])
      b = arr.array('i', [2,7,8,11,3,10])
      a.extend(b)
      print (a)
      It will produce the following output
      array('i', [10, 5, 15, 4, 6, 20, 9, 2, 7, 8, 11, 3, 10])

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