[Tutor] finding factorials - hmm..., gcd

[Payal Rathod]

On Tue, Jul 01, 2003 at 09:51:05PM +0200, Gregor Lingl wrote:

Thanks for the mails all of you and thanks for the "magic" example.
Please clear my doubt below.

Commented example below. Print statements are now numbered.

 print "WHAT'S GOING ON?"
 x =4
 y=10
 z = 0
 print "x =",x,"y =",y,"z =",z	# -------> (1)
 
 def look(a,b):
    print "x =",x,"y =",y,"z =",z,"a =",a,"b =",b # --------> (2)
    a=2*a
    b=2*b
    c=a*b
    print "x =",x,"y =",y,"z =",z,"a =",a,"b =",b,"c =",c # ------> (3)
    return c
    c = c*c       # ;-)
    print "x =",x,"y =",y,"z =",z,"a =",a,"b =",b,"c =",c   # -----> (4)
 
 print "x =",x,"y =",y,"z =",z	# ------------> (5)
 z = look(x,y)     # this will execute 2 (!) print-statements
 # you won't be able to print a,b,c here
 print "x =",x,"y =",y,"z =",z	# ---------> (6)


The output is,

WHAT'S GOING ON?
x = 4 y = 10 z = 0	# This comes from print statement (1)
x = 4 y = 10 z = 0      # This comes from print statement (5)
x = 4 y = 10 z = 0 a = 4 b = 10  
# Where the world this comes from? a and b are never defined anywhere,
# nor are they assigned values of x and y. Where did python get the
# idea that a = 4 and b = 10?
x = 4 y = 10 z = 0 a = 8 b = 20 c = 160
x = 4 y = 10 z = 160
# Once the above question is answered I think this will have the same
# logic.

Thanks a lot for this "magic" example.
With warm regards,
-Payal

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