Need to fix SyntaxError in cycle try

[alexfrol86]

Hi!
In this block, I need to try all combinations of variables in the ht expression and save only those combinations that ensure the equality of the ht to zero.
I have lists of values for each variable used in expression ht. The variable o is an array whose columns contain interrelated values for 2 variables and that values should to be sorted line by line.

I got a SyntaxError in try (invalid syntax). I also used to change the condition with "try" by using the construction with "if" and "insclose(ht, 0)" instead of "ht == 0", but I get the same syntax error.
Please tell me where this error came from and how to fix it.

for i in z30:
  for o in zres:
    for l in z70:
      def function_gam0(et0, y30, ph0b, o, l):
        ht = o[0] * et0 * cos(i) / sqrt(ph0b) + o[1] * -et0 * sin(i) / sqrt(ph0b) + l * sqrt(1 / ph0b) * et0 * sin(i) + funct_labt(i, o[1], l, o[0]) * (sqrt(1 / ph0b) * (1 + et0 * cos(i) * (1 + et0 * cos(i)**2) / ph0b**2
        try:
          ht == 0
          if True:
            lh0 = i, o[0], o[1], l
            return lh0
            print(lh0)
        except:
          pass