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Engineering LibreTexts

4.3: Type Conversion Functions

Python also provides built-in functions that convert values from one type to another. The int function takes any value and converts it to an integer, if it can, or complains otherwise:

>>> int('32')
>>> int('Hello')
ValueError: invalid literal for int() with base 10: 'Hello'

int can convert floating-point values to integers, but it doesn't round off; it chops off the fraction part:

>>> int(3.99999)
>>> int(-2.3)

float converts integers and strings to floating-point numbers:

>>> float(32)
>>> float('3.14159')

Finally, str converts its argument to a string:

>>> str(32)
>>> str(3.14159)