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Python int()

The int() function helps to convert the given value into an integer number. The result integer value always is in base 10.If we use int() with a custom object, then the object __int__() function will be called. 

int(x=0, base=10)# Where x can be Number or string

int() Parameters:

Takes 2 parameters where the first parameter 'x' default value is 0. And the second parameter 'base' default value is 10, it also can be in 0 (code literal) or 2-36.

Parameter Description Required / Optional
x Number or string to be converted to integer object. Required
base  The base of the number in x Optional

int() Return Value

Input Return Value
integer object base as 10
No parameters returns 0
If base given in the given base (0, 2, 8, 10, 16)

Examples of int() method in Python

Example 1:How int() works in Python?

# integer
print("int(123) is:", int(123))

# float
print("int(123.23) is:", int(123.23))

# string
print("int('123') is:", int('123'))


int(123) is: 123
int(123.23) is: 123
int('123') is: 123

Example 2:How int() works for decimal, octal and hexadecimal?

# binary 0b or 0B
print("For 1010, int is:", int('1010', 2))
print("For 0b1010, int is:", int('0b1010', 2))

# octal 0o or 0O
print("For 12, int is:", int('12', 8))
print("For 0o12, int is:", int('0o12', 8))

# hexadecimal
print("For A, int is:", int('A', 16))
print("For 0xA, int is:", int('0xA', 16))


For 1010, int is: 10
For 0b1010, int is: 10
For 12, int is: 10
For 0o12, int is: 10
For A, int is: 10
For 0xA, int is: 10

Example 3:int() for custom objects

class Person:
    age = 23

    def __index__(self):
        return self.age
    def __int__(self):
        return self.age
print('int(person) is:', int(person))


int(person) is: 23

Note:Internally, int() method calls an object's __int__() method.Both these methods should return the same value.The case is that older versions of Python uses __int__(), while newer uses __index__() method.