Float Number Division with 3 Decimal Places

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What will you learn?

Learn how to perform float number division in Python and display the result with three decimal places using string formatting and the round() function.

Introduction to the Problem and Solution

When dividing numbers in Python, the results often contain many decimal places. To limit the output to three decimal places for better readability and precision, we can use techniques like string formatting or the round() function. These methods allow us to control the precision of our division results effectively.

Code

# Divide two numbers and display result with 3 decimal places
result = 10 / 3
formatted_result = "{:.3f}".format(result)
print(formatted_result)  # Output: 3.333

# Alternative method using round() function
result = round(10 / 3, 3)
print(result)  # Output: 3.333

# Copyright PHD

(Credits: PythonHelpDesk.com)

Explanation

In this code snippet: – We divide 10 by 3, resulting in a floating-point number. – By using {:.3f} in string formatting or providing 3 as the second argument in round(), we limit the output to three decimal places.

Method Description
String Formatting {:.3f} ensures only three digits are displayed after the decimal point.
round() Function The second argument specifies the number of decimal places for rounding.

    1. How can I increase or decrease the number of displayed decimals?

      • To adjust displayed decimals, modify the value inside .format() or as a second argument in round().

    3. Is it possible to round up instead of truncating when displaying decimals?

      • Yes, functions like ceil from math module can be used for rounding up.

    5. Can this technique be applied to other mathematical operations besides division?

      • Absolutely! It can be used for any arithmetic operation requiring precise control over floating-point outputs.

    7. What happens if I try to format a non-float type variable using ‘{:.2f}’?

      • Python raises a TypeError since floating-point formatting cannot be applied directly on non-float types like integers or strings.

    9. Does changing precision affect actual calculations during division?

      • No, adjusting precision only changes how values are displayed without affecting calculation accuracy.
Conclusion

Mastering techniques like string formatting and rounding functions in Python is essential for controlling floating-point precision during division operations. This mastery provides better control over output readability and accuracy when working with numerical data.

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