{"id":4681,"date":"2022-09-10T04:36:54","date_gmt":"2022-09-10T04:36:54","guid":{"rendered":"https:\/\/www.pythontutorial.net\/?page_id=4681"},"modified":"2022-09-10T04:43:14","modified_gmt":"2022-09-10T04:43:14","slug":"python-int","status":"publish","type":"page","link":"https:\/\/www.pythontutorial.net\/python-built-in-functions\/python-int\/","title":{"rendered":"Python int"},"content":{"rendered":"\n

Summary<\/strong>: in this tutorial, you’ll learn how to use Python int()<\/code> to convert a number or a string to an integer.<\/p>\n\n\n\n

Introduction to the Python int() constructor #<\/a><\/h2>\n\n\n\n

The int()<\/code> accepts a string<\/a> or a number<\/a> and converts it to an integer. Here’s the int()<\/code> constructor:<\/p>\n\n\n

int(x, base=10)<\/code><\/span><\/pre>\n\n\n
Note that int()<\/code> is a constructor of the built-in int<\/code>  class<\/a>. It is not a function. When you call the int()<\/code>, you create a new integer object.<\/p>\n\n\n\n
If x<\/code> is a string, it should contain a number and is optionally preceded by an optional sign like a minus (-<\/code>) or plus (+<\/code>).<\/p>\n\n\n\n
If x<\/code> is a floating point number, the int() returns the integer value of that number. <\/p>\n\n\n\n
If x<\/code> is an object, the int()<\/code> delegates to the x.__int()__<\/code> method. If the object x<\/code> does not have the __int__()<\/code> method, the int()<\/code> will use the __index__()<\/code> method.<\/p>\n\n\n\n
The x<\/code> argument is optional. If you omit it, the int()<\/code> will return 0<\/code><\/p>\n\n\n\n
The base<\/code> specifies the base for the integer. It defaults to 10.<\/p>\n\n\n\n
Python int() examples #<\/a><\/h2>\n\n\n\n
Let’s take some examples of using Python int()<\/code>.<\/p>\n\n\n\n
\"python<\/figure>\n\n\n\n
1) Using the int() to convert a string to an integer #<\/a><\/h3>\n\n\n\n
The following example uses the int()<\/code> to convert strings to integers:<\/p>\n\n\n
number = int('100'<\/span>)\r\nprint(number)  # ? 100<\/span>\r\n\r\nnumber = int('-90'<\/span>)\r\nprint(number)  # ? -90<\/span>\r\n\r\nnumber = int(' -20\\n'<\/span>)\r\nprint(number)  # ? -20<\/span><\/code><\/span>Code language:<\/span> Python<\/span> (<\/span>python<\/span>)<\/span><\/small><\/pre>\n\n\n
2) Using the int() to convert floating point numbers to integers #<\/a><\/h3>\n\n\n\n
The following example uses the int()<\/code> to convert floating point numbers to integers:<\/p>\n\n\n
number = int(10.0<\/span>)\r\nprint(number)  # ? 10<\/span>\r\nnumber = int(9.99<\/span>)\r\nprint(number)  # ? 9<\/span>\r\nnumber = int(5.01<\/span>)\r\nprint(number)  # ? 5<\/span><\/code><\/span>Code language:<\/span> Python<\/span> (<\/span>python<\/span>)<\/span><\/small><\/pre>\n\n\n
3) Using the Python int() to convert an object to an integer #<\/a><\/h3>\n\n\n\n
The following example illustrates how to use int() to convert an object to an integer:<\/p>\n\n\n
class<\/span> Person<\/span>:<\/span>\r\n    def<\/span> __init__<\/span>(self, name, age)<\/span>:<\/span>\r\n        self.name = name\r\n        self.age = age\r\n\r\n    def<\/span> __int__<\/span>(self)<\/span>:<\/span>\r\n        return<\/span> int(self.age)\r\n\r\n\r\nperson = Person('John Doe'<\/span>, 22<\/span>)\r\nprint(int(person))  # ? 22<\/span>\r\n<\/code><\/span>Code language:<\/span> Python<\/span> (<\/span>python<\/span>)<\/span><\/small><\/pre>\n\n\n
Output:<\/p>\n\n\n
22<\/code><\/span><\/pre>\n\n\n
How it works.<\/p>\n\n\n\n
First, define a class Person<\/code> that has two attributes name<\/code> and age<\/code>. The __int__()<\/code> method returns the integer of the age<\/code>:<\/p>\n\n\n
class<\/span> Product<\/span>:<\/span>\n    def<\/span> __init__<\/span>(self, name, price)<\/span>:<\/span>\n        self.name = name\n        self.price = price\n\n    def<\/span> __int__<\/span>(self)<\/span>:<\/span>\n        return<\/span> int(self.price)<\/code><\/span>Code language:<\/span> Python<\/span> (<\/span>python<\/span>)<\/span><\/small><\/pre>\n\n\n
Second, create a new instance of the Person<\/code> and convert it to an integer:<\/p>\n\n\n
person = Person('John Doe'<\/span>, 22<\/span>)\r\nprint(int(person))  # ? 22<\/span><\/code><\/span>Code language:<\/span> Python<\/span> (<\/span>python<\/span>)<\/span><\/small><\/pre>\n\n\n
Summary #<\/a><\/h2>\n\n\n\n
  • Use Python int()<\/code> to convert a string or a number to an integer.<\/li><\/ul>\n
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