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]

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'

The above is the detailed content of How to Remove Trailing Zeros from Decimal Numbers in Scientific Notation?. For more information, please follow other related articles on the PHP Chinese website!