How to write an exponential number in a constant.

I want to have a global constant that has an exponential expression like:

c1 = 1.009249522e-03, c2 = 2.378405444e-04, c3 = 2.019202697e-07

c1=float("1.009249522e-03");

or

c2 = "1.009249522e-03"

c3= float(c2)

The exponential expression has to be a string and with float it is converted to a float

Edit: I see you wrote constant

If you define a constant you can use 1.009249522e-03 but this will converted to 0.00100925. If you need the exponential expression put it in a string and if you want the float convert the string to a float.