How to get the first letter index of a string after spaces in Python? [duplicate]

Is there a way to get the first letter index of a string after an n number of spaces?

I know it is easily made with a for loop, but for sake of simplicity, is there a cleaner way?

string_1 = "    Hello" # Return 4
string_2 = "        Bye" # Return 8

Method strip() cuts spaces before the first and after the last charactes (and multiple inside like x y.

So:

x = '  abc'
x = x.strip()
print(x)      # result -> 'abc'