having problems with a loop in python

Hi I am having problems with this code please help. PS all your help so far ha really helped me so thank you!!!

    import random

    def whiles():
        myRand = round(random.random() * (0.909 - 0.101) + 0.101, 3)
        print ("myrand Initial", myRand)
        amt = 1000
        amt2 = 0

        while myRand > 0:
    #       def trade1():
            myRand = round(random.random() * (0.909 - 0.101) + 0.101, 3)  
    #       print (myRand)
            if (myRand > 0.5):
                print ("my usd rate", myRand)
                trd1 = amt * myRand
                print ("trade1 =", trd1)
                amtPrev = amt
                def myRandom2():
                    myRand2 = round(random.random() * (1.909 - 1.101) + 1.101, 3)
                    print ("my nzd rate", myRand2)

                if (trd1 * myRand2 < amtPrev):

                    myRand2 = round(random.random() * (1.909 - 1.101) + 1.101, 3)
                    print ("my nzd rate", myRand2)

                else:
                    trd2 = trd1 * myRand2
                    print ("trade2 =", trd2)
                myRandom2()  


        else:
            print ("error less than 0.5")

    whiles()

Ok so what i am trying to do is in the second if statement if (trd1 * myRand2 < amtPrev) I would like to then go back a few steps to the myRand2 underneath def myrandom2() and essentially run myRandom2 again until I have a value which = (trd1 * myRand2 > amtPrev). I am not sure if i need to do the functions trade1 and trade2? to do this. If i do end up with a value where trd2 > amtPrev i would then like to do the function trade1 again and make sure that the next trd1 amount = more than the last trd2 amount and then run the while loop infinitely im almost there but am stuck at the end.

Thanks for your help