Convert to octal python

Converting a String to Octal in Python

In this blog, we will learn how to convert strings to octal representation in Python. Explore multiple methods, including built-in functions and manual conversion, and understand the advantages and limitations of each approach.

Introduction:

In the field of programming, working with data in various formats is a frequent requirement. Octal, which is a numeral system based on eight, is commonly used in computer science, especially when dealing with file permissions. In octal numbers, each digit represents a specific set of permissions, making it highly valuable in certain applications. This blog aims to provide a complete guide to octal conversion in Python.

Method 1: Using the built-in oct() function

Python offers a convenient built-in function called oct() , primarily used to convert integers to octal representation. However, since we want to convert a string to octal, we first need to convert it to an integer. Here’s the code snippet:

def string_to_octal_method1(string): # Convert string to integer integer_value = int(string) # Convert integer to octal octal_value = oct(integer_value) return octal_value 

Let’s convert the string «42» to octal using Method 1:

string = "42" result = string_to_octal_method1(string) print(result) 

Output:

Method 2: Using the format() function

Another approach involves utilizing the format() function, which provides flexible formatting options for strings. By specifying the format as ‘o’ , we can convert an integer to an octal string. Here’s an example:

def string_to_octal_method2(string): # Convert string to integer integer_value = int(string) # Convert integer to octal using format() octal_value = format(integer_value, 'o') return octal_value 

Let’s convert the string «42» to octal using Method 2:

string = "42" result = string_to_octal_method2(string) print(result) 

Output:

Method 3: Manual conversion using division and remainder

If we want to explore a more manual approach, we can convert a string to octal by performing division and obtaining remainders. This method is especially useful for educational purposes or when built-in functions are unavailable. Here’s an example:

def string_to_octal_method3(string): # Convert string to integer integer_value = int(string) # Initialize variables octal_value = '' while integer_value > 0: remainder = integer_value % 8 octal_value = str(remainder) + octal_value integer_value //= 8 return octal_value 

Let’s convert the string «42» to octal using Method 3:

string = "42" result = string_to_octal_method3(string) print(result) 

Output:

Conclusion:

In this blog post, we explored various methods to convert a string to octal in Python. We discussed three different approaches: utilizing the oct() function, leveraging the format() function, and performing manual conversion using division and remainders. Understanding octal conversion is crucial when working with systems that employ octal representation, such as file permissions. By mastering these techniques, you can confidently manipulate and convert data in octal format, expanding your programming skills.

Related Post

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Python Decimal to Octal Conversion

In this article, we will learn how to convert a decimal to octal in Python using multiple different methods.

Decimal and Octal Numbers

Decimal Number

+Decimal numbers are the numbers that we use in our day-to-day life. They are also called Base 10 numbers. The decimal number system has 10 digits from 0 to 9.

Octal Number

Octal numbers are the numbers that include digits from 0 to 7. They are also called Base 8 numbers.

Octal numbers are used in computer programming. They are used to represent the permissions of a file in Linux. For example, the permission of a file is 644. Here, 6 is the permission for the owner, 4 is the permission for the group and 4 is the permission for others.

Decimal to Octal Conversion

There could be multiple ways to convert a decimal number to an octal number but at the base level, we need to divide the decimal number by 8 and keep on dividing until we get a quotient of 0.

The remainder of each division is written in reverse order to get the octal number.

1. Decimal to Octal in Python using oct()

The oct() is a built-in function in Python that can convert a decimal number to an octal number.

It takes a decimal number as an argument and returns the octal number.

num = int(input("Enter a decimal number: ")) octal = oct(num) print(octal) 

Enter a decimal number: 123 0o173

2. Decimal to Octal in Python using format()

The format() function is used to format the output of a number. But it can also be used to convert numbers from one base to another.

For this purpose, it uses format specifiers. The format specifier for octal number is o .

It can be used in different ways. Look at the following examples:

num = int(input("Enter a decimal number: ")) oct1 = format(num, 'o') print(oct1) oct2 = ''.format(num) print(oct2) oct3 = f'' print(oct3)

Enter a decimal number: 73 111 111 111

3. Decimal to Octal in Python using Custom Function

We have discussed above how we can convert decimal numbers to octal numbers by dividing the decimal number by 8.

Now let’s create a function that takes a decimal number as an argument and returns the octal number.

Algorithm

1. Take a decimal number as an argument.
2. Initialize an empty string to store the octal number if you want to return a string or assign 0 to a variable if you want to return an integer.
3. Execute a while loop that runs until the input number is greater than 0.
4. Find the remainder of the input number by 8 and concatenate it to the string at the beginning or add it to the variable by multiplying it with a factor of 10.
5. Divide the input number by 8 and assign it to the input number.
6. Return the string or the variable.

def dec2oct(num): # empty string to store the octal number octal = '' while num > 0: octal = str(num % 8) + octal num //= 8 return octal num = int(input("Enter a decimal number: ")) print(dec2oct(num))

def dec2oct(num): # define octal number and initialize it to 0 octal = 0 i = 1 while num > 0: octal += (num % 8) * i num //= 8 i *= 10 return octal num = int(input("Enter a decimal number: ")) print(dec2oct(num))

Enter a decimal number: 258 402

4. Decimal to Octal in Python using Recursion

In this program, we will use recursion to convert decimal numbers to octal numbers.

Algorithm

1. Take a decimal number as an argument.
2. Check if the input number is less than 8. If yes, return the input number.
3. Otherwise, return the remainder of the input number by 8 concatenated with the function call with the input number divided by 8.

Enter a decimal number: 81 121

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Decimal to Octal in Python

Decimal to Octal in Python | In Computer Science, generally Octal number system used to store big data values. The octal system is the base 8 number system. We can also convert from Binary to Decimal, Decimal to Binary and Octal to Decimal, Octal to Binary and Binary to Octal also can be done.

Note:- 8 & 9 are not present in the Octal number system.

Python Program to Convert Decimal to Octal

This python program using a while loop to convert decimal to octal. We can also take the help of a user-defined function. A function is a block of code that performs a specific task. We will take a decimal number while declaring the variables. Python program to convert decimal to octal using while loop and finally, the result will be displayed on the screen.

# Python program to convert decimal to octal def DecimalOctal(num): octal = [0] * 100 # counter for octal number array i = 0 while (num != 0): # store remainder in octal array octal[i] = num % 8 num = int(num / 8) i += 1 # print octal number array in reverse order for j in range(i - 1, -1, -1): print(octal[j], end='') # take inputs num = int(input('Enter a decimal number: ')) # calling function and display result print('Octal value: ', end='') DecimalOctal(num)

Output for the different input values:-

Enter a decimal number: 10
Octal value: 12

Enter a decimal number: 25
Octal value: 31

Enter a decimal number: 1258
Octal value: 2352

Program Without using Array

In the previous program, convert decimal to octal using array but in this program, convert decimal to octal without using an array.

# Python program to convert decimal to octal def DecimalOctal(num): octal, i = 0, 1 while (num != 0): rem = num % 8 # remainder is calculated octal += rem * i # store exponential value i = i*10 num //= 8 print(octal) # take inputs num = int(input('Enter a decimal number: ')) # calling function and display result print('Octal value: ', end='') DecimalOctal(num)

Enter a decimal number: 5
Octal value: 5

Time Complexity of above program is 0(log N) and Auxiliary Space is 0(1).

Convert Decimal to Octal using Recursion

A function/method that contains a call to itself is called the recursive function/method. A technique of defining the recursive function/method is called recursion. The recursive function/method allows us to divide the complex problem into identical single simple cases that can handle easily. This is also a well-known computer programming technique: divide and conquer.

# Python program to convert decimal to octal using recursion def DecimalOctal(num): if(num > 0): DecimalOctal((int)(num/8)) print(num%8, end='') # take input num = int(input('Enter a decimal number: ')) # calling function and display result print('Octal value: ', end='') DecimalOctal(num)

Enter a decimal number: 100
Octal value: 144

Convert Decimal to Octal in Python

This is the simplest and easiest program in python because this program used a built-in function. We will take the decimal number when declaring the variable and print the octal value of the number using the oct() function.

oct() method returns the octal form of a passed number as a parameter. It returns an octal number in the form of 0oxx, where xx is the number form of octal representation.

# Python program to convert decimal to octal # take input num = int(input('Enter any decimal number: ')) # display result print('Octal value:', oct(num))

Enter any decimal number: 50
Octal value: 0o62

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