numformat

Numformat is a library that helps you easily format number-like objects (int, float, decimal.Decimal, str) in a way that is consistent with scientific and engineering practices.

It has options to convert number-like objects to strings with different notations while allowing control over Significant Figures, Precision, and output string length.

Usage examples:

Importing the package:

import numformat as nf

Formatting to scientific and engineering notations:

# Convert to scientific notation
nf.sciformat(103000000)
>> '1.03e+08'

# Convert to engineering notation
nf.enggformat("103000000")
>> '103E+6'

Using autoformat:

# Auto-format with default options
nf.autoformat(1030000.0)
>> '1030000.0'

nf.autoformat(103000000.0)
>> '1.03e+08'

Using autoformat with the max_sig_figs argument:

# Auto-format and use a maximum of 5 significant figures
nf.autoformat(103000.000, max_sig_figs=5)
>> '103000'

# Auto-format and use a maximum of 2 significant figures
nf.autoformat("10300.00", max_sig_figs=2)
>> '10000'

Using autoformat with the max_length argument:

# Auto-format to a string that has a maximum length of 6 characters
nf.autoformat(103000000, max_length=6)
>> '1e+08'

Using autoformat with the preserve_sig_figs argument:

# Auto-format to a string that has a maximum length of 8 characters
nf.autoformat(103100000, max_length=8, preserve_sig_figs=False)
>> '1.03e+08'

# Auto-format to a string that has a maximum length of 8 characters but also preserve all significant figures.
nf.autoformat(103100000, max_length=8, preserve_sig_figs=True)
>> '103.1E+6'

Controlling the format type in autoformat:

# Auto-format to a string with a maximum length of 6 characters but don't allow scientific notation
nf.autoformat(103000000, max_length=6, allow_scientific_notation=False)
>> '103E+6'

# Auto-format to a string with a maximum length of 6 characters but don't allow scientific or engineering notation. 
# Conditions cannot be met, therefore, it returns the number in standard notation.
nf.autoformat(103000000, max_length=6, allow_scientific_notation=False, allow_engineering_notation=False)
>> '103000000'

Raising an error if formatting fails:

# Auto-format to a string with a maximum length of 6 characters but don't allow scientific or engineering notation. 
# Conditions cannot be met, and strict = True, therefore, returns an error.
nf.autoformat(103000000, max_length=6, allow_scientific_notation=False, allow_engineering_notation=False, strict=True)
>> ValueError: Could not represent the input within 6 characters.