Other than some generic containers like list, Python in its definition can also handle containers with specified data types. The array can be handled in python by a module named “array“. They can be useful when we have to manipulate only a specific data type values.
Operations on Array :
1. array(data type, value list):- This function is used to create an array with data type and value list specified in its arguments. Some data types are mentioned in the table below.
Type Code | C Type | Python Type | Minimum size in Bytes |
---|---|---|---|
‘b’ | signed char | int | 1 |
‘B’ | unsigned char | int | 1 |
‘u’ | Py_UNICODE | unicode character | 2 |
‘h’ | signed short | int | 2 |
‘H’ | unsigned short | int | 2 |
‘i’ | signed int | int | 2 |
‘I’ | unsigned int | int | 2 |
‘l’ | signed long | int | 4 |
‘L’ | unsigned long | int | 4 |
‘q’ | signed long long | int | 8 |
‘Q’ | unsigned long long | int | 8 |
‘f’ | float | float | 4 |
‘d’ | double | float | 8 |
2. append():- This function is used to add the value mentioned in its arguments at the end of the array.
3. insert(i,x) :- This function is used to add the value(x) at the ith position specified in its argument.
Python
# Python code to demonstrate the working of # array(), append(), insert() # importing "array" for array operations import array # initializing array with array values # initializes array with signed integers arr = array.array( 'i' , [ 1 , 2 , 3 ]) # printing original array print ( "The new created array is : " ,end = " " ) for i in range ( 0 , 3 ): print (arr[i], end = " " ) print ( "\r" ) # using append() to insert new value at end arr.append( 4 ); # printing appended array print ( "The appended array is : " , end = "") for i in range ( 0 , 4 ): print (arr[i], end = " " ) # using insert() to insert value at specific position # inserts 5 at 2nd position arr.insert( 2 , 5 ) print ( "\r" ) # printing array after insertion print ( "The array after insertion is : " , end = "") for i in range ( 0 , 5 ): print (arr[i], end = " " ) |
Output:
The new created array is : 1 2 3 The appended array is : 1 2 3 4 The array after insertion is : 1 2 5 3 4
4. pop():- This function removes the element at the position mentioned in its argument and returns it.
5. remove():- This function is used to remove the first occurrence of the value mentioned in its arguments.
Python3
# Python code to demonstrate the working of # pop() and remove() # importing "array" for array operations import array # initializing array with array values # initializes array with signed integers arr = array.array( 'i' ,[ 1 , 2 , 3 , 1 , 5 ]) # printing original array print ( "The new created array is : " ,end = "") for i in range ( 0 , 5 ): print (arr[i],end = " " ) print ( "\r" ) # using pop() to remove element at 2nd position print ( "The popped element is : " ,end = "") print (arr.pop( 2 )); # printing array after popping print ( "The array after popping is : " ,end = "") for i in range ( 0 , 4 ): print (arr[i],end = " " ) print ( "\r" ) # using remove() to remove 1st occurrence of 1 arr.remove( 1 ) # printing array after removing print ( "The array after removing is : " ,end = "") for i in range ( 0 , 3 ): print (arr[i],end = " " ) |
Output:
The new created array is : 1 2 3 1 5 The popped element is : 3 The array after popping is : 1 2 1 5 The array after removing is : 2 1 5
6. index() :- This function returns the index of the first occurrence of value mentioned in arguments.
7. reverse() :- This function reverses the array.
Python
# Python code to demonstrate the working of # index() and reverse() # importing "array" for array operations import array # initializing array with array values # initializes array with signed integers arr = array.array( 'i' ,[ 1 , 2 , 3 , 1 , 2 , 5 ]) # printing original array print ( "The new created array is : " ,end = "") for i in range ( 0 , 6 ): print (arr[i],end = " " ) print ( "\r" ) # using index() to print index of 1st occurrenece of 2 print ( "The index of 1st occurrence of 2 is : " ,end = "") print (arr.index( 2 )) #using reverse() to reverse the array arr.reverse() # printing array after reversing print ( "The array after reversing is : " ,end = "") for i in range ( 0 , 6 ): print (arr[i],end = " " ) |
Output:
The new created array is : 1 2 3 1 2 5 The index of 1st occurrence of 2 is : 1 The array after reversing is : 5 2 1 3 2 1
Reference :
https://docs.python.org/3/library/array.html#module-array
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