How Can I Remove Trailing Zeros from Floating-Point Numbers While Maintaining Precision?

Preserving Float Precision Without Trailing Zeros

When dealing with floating-point numbers, it can be desirable to remove trailing zeros to maintain a concise representation. This ensures the numeric string is as short as possible while preserving its precision.

Using the '%g' Format Specifier

One solution is to use the '%g' format specifier, which is designed to generate a compact string representation of a floating-point number. It removes trailing zeros and the decimal point if no digits follow it. For example:

>>> '%g' % 3.140
'3.14'

Utilizing Format String Functions

In Python versions 2.6 and later, you can use the format method to achieve the same result:

>>> '{0:g}'.format(3.140)
'3.14'

For Python 3.6 and above, the f-string syntax offers a concise alternative:

>>> f'{3.140:g}'
'3.14'

Explanation from the Documentation

The documentation for the format function states that '%g' causes insignificant trailing zeros to be removed from the significand (the part before the decimal point). If there are no remaining digits after the decimal point, it is also removed. This behavior conveniently aligns with our goal of removing trailing zeros from floated-point strings.

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