Quick and Painless Tutorial (cont)

 >>> # Fibonacci series:
 ... # the sum of two elements defines the next
 ... a, b = 0, 1
 >>> while b < 10:
 ...       print b, 
 ...       a, b = b, a+b
 1 1 2 3 5 8

 # control flow:

 a = raw_input("please enter a number: "); 
 if (a < 3): print "too low, joe"
 elif (a >7): print "too big, nick"
 else: print "you win, jim"

 lst = ['aaaa', 'bv', 'ccc']
 for s in lst: print s, len(s)

 # range(a,b) generates a list of numbers from a (inclusive) 
 # to b (exclusive). the first parameter defaults to 0. 
 range(2) == [0,1]

 # break and continue work like in c
 # pass when waiting for an external event or to do nothing