How can I display a Decimal in scientific notation without unnecessary zeros?

Displaying Decimals in Scientific Notation

The question poses the challenge of displaying a Decimal in scientific notation without the presence of unnecessary zeros. For instance, representing the Decimal '40800000000.00000000000000' as '4.08E 10' while omitting the extra zeros.

One approach attempted by the user involved using '%E' on Decimal('40800000000.00000000000000'), but the resulting '4.080000E 10' contained additional zeros.

The solution lies in explicitly specifying the desired precision using '%E' with a format like '%.2E'. For instance, '%.2E' % Decimal('40800000000.00000000000000') correctly returns '4.08E 10'.

If desired, trailing zeros can be automatically removed using custom code. The 'format_e' function accomplishes this by first splitting the scientific notation string 'a' into its base and exponent components. It then removes leading and trailing zeros from the base and reconstructs the scientific notation string with the adjusted base. Applying 'format_e' to various Decimal inputs demonstrates its ability to remove extra zeros and format scientific notation appropriately.

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