How to Remove Trailing Zeros from Decimal Numbers in Scientific Notation?

Barbara Streisand
Release: 2024-11-06 17:33:02
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How to Remove Trailing Zeros from Decimal Numbers in Scientific Notation?

Scientific Notation with Decimals

How to display large decimal numbers in scientific notation can be a common challenge. Particularly, removing unnecessary trailing zeros from the mantissa can be desirable.

To specify the precision of the mantissa, use the %.2E format string. For instance, '%.2E' % Decimal('40800000000.00000000000000') returns '4.08E 10'.

However, if you want to automatically remove all trailing zeros, a custom function like the following can be employed:

def format_e(n):
    a = '%E' % n
    return a.split('E')[0].rstrip('0').rstrip('.') + 'E' + a.split('E')[1]
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This function can handle various decimal input values. For example:

format_e(Decimal('40800000000.00000000000000'))
# Output: '4.08E+10'

format_e(Decimal('40000000000.00000000000000'))
# Output: '4E+10'

format_e(Decimal('40812300000.00000000000000'))
# Output: '4.08123E+10'
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