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int() function in Python
• Last Updated : 23 Oct, 2020

int() function in Python and Python3 converts a number in given base to decimal.

Syntax :

`int(string, base)`

Parameter :

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

Returns :

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

Errors :

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

Code #1 :

 `# 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```

Code #2 :

 `# 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```

Code #3 : Program to demonstrate the TypeError.

 `# 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 :

```Traceback (most recent call last):
File "/home/d87cec4c0c33aad3bb6187858b40b734.py", line 8, in
decimal = int(binaryString, 2)
TypeError: int() can't convert non-string with explicit base```

.

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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