replacement for fpformat.extract

[deanhystad]

Since you know you'll be passing in a number and you know the format, you can make assumptions that could not be made by fpformat.extract()

import re


values = [-10999999.0, -10234.0, -123.456, -10.4, -0.00137, 0.0, 0.00137, 10.4, 123.456, 10234.0, 10999999]

for v in values:
    s, w, f, e = re.match(r'(-?)(.)\.(.+)e(.*)', f"{v:.8e}").groups()
    print(f"{v:11} :  {s:1}  {w:1}  {f:8}  {e}")

Output:
-10999999.0 :  -  1  09999990  +07
   -10234.0 :  -  1  02340000  +04
   -123.456 :  -  1  23456000  +02
      -10.4 :  -  1  04000000  +01
   -0.00137 :  -  1  37000000  -03
        0.0 :     0  00000000  +00
    0.00137 :     1  37000000  -03
       10.4 :     1  04000000  +01
    123.456 :     1  23456000  +02
    10234.0 :     1  02340000  +04
   10999999 :     1  09999990  +07