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Python int()

The int() is the built-in method of python, which converts any number or string objects into an integer object; it is also used for typecasting the integer number.

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Python int()
Python int()
By khushal jethava
1 min read
Python int()

The syntax of int() is:

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int(value, base)

int() Parameters

int() method takes two parameters as an argument:

  • value - A number or string object which wants to convert into an integer number. By default, it takes zero as an argument.
  • base - A base number that represents the number format. The default value is 10.

Let us see some examples of int() methods in python.

Example 1: How to use the int() method in python?

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print(int(123))

print(int(123.456))

print(int("123"))

Output:

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123
123
123

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

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# 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))

Output:

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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

It will cause an “invalid literal for int()” error when using strings with non-numerical values.

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print(int("Python"))

The output will be as follow:

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Traceback (most recent call last):
  File "", line 1, in <module>
    print(int("Python"))
ValueError: invalid literal for int() with base 10: 'Python'

Rules of int() method

  • an integer object from the given number or string treats the default base as 10
  • (No parameters) returns 0
  • (If base given) treats the string in the given base (0, 2, 8, 10, 16)
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