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Use the Python decimal module when you want to support fast correctly-rounded decimal floating-point arithmetic. Use the Decimal class from the decimal module to create Decimal object from strings, integers, and tuples.
- Quick-start Tutorial¶ The usual start to using decimals is importing the module, viewing the current context with getcontext() and, if necessary, setting new values for precision, rounding, or enabled traps
- Decimal objects¶ class decimal.Decimal(value='0', context=None)¶ Construct a new Decimal object based from value. value can be an integer, string, tuple, float, or another Decimal object.
- Context objects¶ Contexts are environments for arithmetic operations. They govern precision, set rules for rounding, determine which signals are treated as exceptions, and limit the range for exponents.
- Constants¶ The constants in this section are only relevant for the C module. They are also included in the pure Python version for compatibility. 32-bit.
Jul 15, 2012 · In Python2 you have to specify at least one of the operands as a floating point number. To take just 3 decimals you can use the round() method: >>> a = 1.0 / 3. >>> round(a, 3) 0.333. In Python3 it seems they don't perform integer division by default, so you can do: >>> a = 1/3. >>> round(a, 3) 0.333.
Jun 24, 2021 · How to use the decimal module in Python? To use the decimal module in python, we can import it as follows. import decimal. The imported module has a predefined context which contains default values for precision, rounding, flags, minimum and maximum numbers allowed.
Jan 29, 2024 · Python Decimal tutorial shows how to perform high-precision calculations in Python with Decimal. The Python decimal module provides support for fast correctly-rounded decimal floating point arithmetic.
In this tutorial, you'll learn about numbers and basic math in Python. You'll explore integer, floating-point numbers, and complex numbers and see how perform calculations using Python's arithmetic operators, math functions, and number methods.
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Formatting can be used when you want to round off a number to a specific number of decimal places, or when you want your number to be separated by commas. To format numbers we can use f-string or format() function.
