How to Display Large Decimals in Scientific Notation Without Trailing Zeros?

Scientific Notation for Decimals

Displaying large decimals in scientific notation can be tricky, especially when there are trailing zeros. Here's how to do it:

Using Decimal and '%.2E'

from decimal import Decimal

print('%.2E' % Decimal('40800000000.00000000000000'))  # returns '4.08E+10'

By specifying %.2E, we limit the output to two decimal places, effectively removing the extra zeros.

Eliminating Trailing Zeros Automatically

If you want to eliminate all trailing zeros, you can use this custom function:

def format_e(n):
    a = '%E' % n
    return a.split('E')[0].rstrip('0').rstrip('.') + 'E' + a.split('E')[1]

This function:

• Splits the scientific notation string into the mantissa and exponent using 'E'.
• Removes trailing zeros and the decimal point from the mantissa.
• Reconstructs the scientific notation string with the modified mantissa.

Examples

format_e(Decimal('40800000000.00000000000000'))  # '4.08E+10'
format_e(Decimal('40000000000.00000000000000'))  # '4E+10'
format_e(Decimal('40812300000.00000000000000'))  # '4.08123E+10'

This approach automatically handles trailing zeros, ensuring concise scientific notation for even large decimals.

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