 # bin () in Python

Naive methods for decimal to binary conversion

1. Using recursion

 ` # Function for printing a binary number for ` ` # entering a decimal numbers using recursion ` ` def ` ` decimalToBinary (n): `   ` if ` ` n & gt; ` ` 1 ` `: ` ` # share with cumulative result ` ` # (cancel remainder) ` ` decimalToBinary (n ` ` / ` ` / ` ` 2 ` `) `     `  print (n % 2 , end = "")  ````   # Driver code if __ name__  = = `__main__` :   decimalToBinary ( 8 ) print ( "" ) decimalToBinary ( 18 ) print ( "" ) decimalToBinary ( 7 )   print  ```

Output:

` 1000 10010 111 `

2. Using the loop

 ` # Python code to demonstrate the naive method ` ` # using loop `   ` # function that returns a binary string ` ` def ` ` Binary (n): ` ` binary ` ` = ` ` "" ` ` i ` ` = ` ` 0 ` ` while ` ` n & gt; ` ` 0 ` ` and ` ` i & lt; ` ` = ` ` 8 ` `: ` ` ` ` s1 ` ` = ` ` str ` ` (` ` int ` ` (n ` `% ` ` 2 ` `)) ` ` ` ` binary ` ` = ` ` binary ` ` + ` ` s1 ` ` ` ` n ` ` / ` ` = ` ` 2 ` ` i ` ` = ` ` i ` ` + ` ` 1 ` ` ` ` d ` ` = ` ` binary [:: ` ` - ` ` 1 ` `] ` ` ` ` return ` ` d ` `  ```` print ( "The binary representation of 100 (using loops) is: " , end = " ") print (Binary ( 100 )) ```

Output:

` The binary representation of 100 (using loops) is: 001100100 `

Using bin ()

Using bin () reduces the time required for coding and also removes the difficulties you might see in the above two methods.

`  Syntax:  bin (a)  Parameters:   a:  an integer to convert  Return Value:  A binary string of an integer or int object.  Exceptions:  Raises TypeError when a float value is sent in arguments. `

` `

``` # Python code to demonstrate how it works # bin ()   # function that returns a binary string def Binary (n): s = bin (n)   # remove the prefix & quot; 0b & quot; s1 = s [ 2 :] return s1   print ( "The binary representation of 100 (using bin ()) is:" , end = "") print (Binary ( 100 )) ```

Output:

` The binary representation of 100 (using bin ()) is: 1100100 `

This article courtesy of Manjit Singh . If you are as Python.Engineering and would like to contribute, you can also write an article using contribute.python.engineering or by posting an article contribute @ python.engineering. See my article appearing on the Python.Engineering homepage and help other geeks.