Converting a for loop to corresponding while loop

for count in range(0,100,2):
   print 'For:',count

count1 =0
while(count1<100):
  print 'While:',count1
  count1=count1+2

Evaluating expression in Python

x=2
y=3
z=2

print x**y**z  #Answer 512

print (x**y)**z  #Answer 64

print x**(y**z)  #Answer 512