Testing thread etc.

#Based on: Sz. P.
import time
import math
from math import sqrt
import random
import threading

class tests:
    def __init__(self):
        self.lessthan1 = []
        self.lessthan2 = []
        self.lessthan3 = []
        self.lessthan4 = []
        self.tomb = []
    def withdot(self):
        starttime=time.time()
        for i in range(1,10000000):
            a=math.sqrt(i)
        print('withdot: \n',time.time()-starttime,'\n')

    def withoutdot(self):
        starttime=time.time()
        for i in range(1,10000000):
            a=sqrt(i)
        print('without dot:',time.time()-starttime,'\n')

    def loops(self):
        print('loops' ,'\n')
        self.tomb=random.sample(range(0, 100000000), 10000000)
        starttime=time.time()
        self.lessthan1=[i for i in self.tomb if i<50000000]

        print('Listiter:',time.time()-starttime ,'\n')
    def range(self):
        starttime=time.time()
        for i in range(0,len(self.tomb)):
            if self.tomb[i]<50000000:
                self.lessthan2.append(self.tomb[i])
        print('Range:   ',time.time()-starttime,"\n")
    def foreach(self):
        starttime=time.time()
        for i in self.tomb:
            if i<50000000:
                self.lessthan3.append(i)
        print('foreach: ',time.time()-starttime,"\n")
    def whileofwhile(self):
        i=0
        starttime=time.time()
        while i<len(self.tomb):
            if self.tomb[i]<50000000:
                self.lessthan4.append(self.tomb[i])
            i+=1
        print('while:   ',time.time()-starttime,"\n")

test = tests()
test.withdot()
test.withoutdot()
test.loops()

test.range()
test.foreach()
test.whileofwhile()

print ("Experimental")


t1 = threading.Thread(target=test.withdot)
t2 = threading.Thread(target=test.withoutdot)
t3 = threading.Thread(target=test.loops)
t4 = threading.Thread(target=test.range)
t5 = threading.Thread(target=test.foreach)
t6 = threading.Thread(target=test.whileofwhile)
t1.start()
t2.start()
t1.join()
t2.join()
t3.start()
t4.start()
t5.start()
t6.start()

t3.join()
t4.join()
t5.join()
t6.join()
print("Test Finshed")