Python array declaration by type

Python provides array declaration of specific types(ex-int, float, char). It is much faster(~10x) than normal array. Lets go to the code.

import array

# integer array declaration
a_int = array.array('i')
a_int.append(5)  # Error a_int.append(5.5)
print a_int[0]
a_int = array.array('i', range(10))
print a_int[7]

# float array declaration
a_float = array.array('f')
a_float.append(10)
print a_float[0]

# character array declaration
a_char = array.array('c')
a_char.append('A')
print a_char[0]

a_char = array.array('c', "python")
print a_char[1]

Output:

5
7
10.0
A
y

Code snippet: Array initilize by odd number

a=[i for i in range(0,20) if i%2]
print a

Output:

[1, 3, 5, 7, 9, 11, 13, 15, 17, 19]

python multidimentional array

'''
   This code use python array syntax
'''
# declare a 2D array
array = [ [0 for col in range(3) ] for row in range(3)]

print array
# update array
array[1][1]=5
print array

Output:

[[0, 0, 0], [0, 0, 0], [0, 0, 0]]
[[0, 0, 0], [0, 5, 0], [0, 0, 0]]

python array example

'''
    This code use array syntax
'''
myArray=[]
myArray.append(1)
myArray.append(2)
myArray.append(6)
myArray.append(3)

print "Array length ",len(myArray)

'''
   access array data
'''
print myArray
for n in myArray:
    print n
for i in range(0,len(myArray)):
    print myArray[i]

'''
   sort array
'''
myArray.sort()
print myArray

Output:

Array length  4
[1, 2, 6, 3]
1
2
6
3
1
2
6
3
[1, 2, 3, 6]

python String Array

'''
    This code use string array syntax
'''
words=[]
words.append("Life")
words.append("is")
words.append("very")
words.append("easy")
words.append("with")
words.append("Python")

for word in words:
    print word

wordLed=len(words)
for i in range(0,wordLed):
    print words[i]

print words

Output:

Life
is
very
easy
with
Python
Life
is
very
easy
with
Python
['Life', 'is', 'very', 'easy', 'with', 'Python']