Use fixed exponent in scientific notation

by

Format it yourself (see Format Specification Mini-Language):

for ix in [.02e9, .2e9, 2e9, 20e9, 200e9, 2000e9]:
    print('{:.3e} => {:0=8.3f}e9'.format(ix, ix / 1e9))

Output

2.000e+07 => 0000.020e9
2.000e+08 => 0000.200e9
2.000e+09 => 0002.000e9
2.000e+10 => 0020.000e9
2.000e+11 => 0200.000e9
2.000e+12 => 2000.000e9

Explanation

{:0=8.3f} means “zero-pad, pad between the sign and the number, total field width 8, 3 places after the decimal, fixed point format”.

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