# int() function in Python

• Difficulty Level : Medium
• Last Updated : 21 Sep, 2021

Python int() function returns an integer from a given object or converts a number in a given base to decimal.

### Python int() Syntax :

int(string, base)

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### Python int() Parameter :

• string : consists of 1’s and 0’s
• base : (integer value) base of the number.

### Python int() Returns :

Returns an integer value, which is equivalent of binary string in the given base.

### Python int() Exception and Errors :

TypeError : Returns TypeError when any data type other than string or integer is passed in its equivalent position.

## Python3

 `# Python3 program for implementation``# of int() function``num ``=` `13` `String ``=` `'187'` `# Stores the result value of``# binary "187" and num addition``result_1 ``=` `int``(String) ``+` `num``print``(``"int('187') + 13 = "``, result_1, ``"\n"``)` `# Example_2``str` `=` `'100'` `print``(``"int('100') with base 2 = "``, ``int``(``str``, ``2``))``print``(``"int('100') with base 4 = "``, ``int``(``str``, ``4``))``print``(``"int('100') with base 8 = "``, ``int``(``str``, ``8``))``print``(``"int('100') with base 16 = "``, ``int``(``str``, ``16``))`

Output :

```int('187') + 13 =  200

int('100') with base 2 =  4
int('100') with base 4 =  16
int('100') with base 8 =  64
int('100') with base 16 =  256```

## Python3

 `# Python3 program for implementation``# of int() function` `# "111" taken as the binary string``binaryString ``=` `"111"` `# Stores the equivalent decimal``# value of binary "111"``Decimal ``=` `int``(binaryString, ``2``)` `print``(``"Decimal equivalent of binary 111 is"``, Decimal)` `# "101" taken as the octal string``octalString ``=` `"101"` `# Stores the equivalent decimal``# value of binary "101"``Octal ``=` `int``(octalString, ``8``)` `print``(``"Decimal equivalent of octal 101 is"``, Octal)`

Output :

```Decimal equivalent of binary 111 is 7
Decimal equivalent of octal 101 is 65```

## Python3

 `# Python3 program to demonstrate``# error of int() function`  `# when the binary number is not``# stored in as string``binaryString ``=` `111` `# it returns an error for passing an``# integer in place of string``decimal ``=` `int``(binaryString, ``2``)` `print``(decimal)`

Output :

`TypeError: int() can't convert non-string with explicit base`

## Python3

 `try``:``    ``var ``=` `"Geeks"``    ``print``(``int``(var))``except` `ValueError as e:``    ``print``(e)`

Output:

invalid literal for int() with base 10: ‘Geeks’

### Application :

It is used in all the standard conversions. For example conversion of binary to decimal, octal to decimal, hexadecimal to decimal.

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