Added obfuxcated lambda's by Ulf Bertelt

gvanrossum · gvanrossum · commit c24da7cbbcd1 · 1994-09-23T14:08:41.000Z
diff --git a/Misc/FAQ b/Misc/FAQ
@@ -116,6 +116,7 @@ Here's an overview of the questions per chapter:
         ImportError: No module named ...; what gives?
   4.11. Q. What GUI toolkits exist for Python?
   4.12. Q. Are there any interfaces to commercial database in Python?
+  4.13. Q. Is it possible to write obfuscated one-liners in Python?
 
  5. Extending Python
   5.1. Q. Can I create my own functions in C?
@@ -683,6 +684,35 @@ A. There's an interface to SYBASE by John Redford
 There's also an interface to metalbase by Lance Ellinghouse
 <lance@markv.com>.
 
+4.13. Q. Is it possible to write obfuscated one-liners in Python?
+
+A. Yes.  See the following three examples, due to Ulf Bartelt:
+
+# Primes < 1000
+print filter(None,map(lambda y:y*reduce(lambda x,y:x*y!=0,\
+map(lambda x,y=y:y%x,range(2,int(pow(y,0.5)+1))),1),range(2,1000)))
+
+# First 10 Fibonacci numbers
+print map(lambda x,f=lambda x,f:(x<=1) or (f(x-1,f)+f(x-2,f)): f(x,f),\
+range(10))
+
+# Mandelbrot set
+print (lambda Ru,Ro,Iu,Io,IM,Sx,Sy:reduce(lambda x,y:x+y,map(lambda y,\
+Iu=Iu,Io=Io,Ru=Ru,Ro=Ro,Sy=Sy,L=lambda yc,Iu=Iu,Io=Io,Ru=Ru,Ro=Ro,i=IM,\
+Sx=Sx,Sy=Sy:reduce(lambda x,y:x+y,map(lambda x,xc=Ru,yc=yc,Ru=Ru,Ro=Ro,\
+i=i,Sx=Sx,F=lambda xc,yc,x,y,k,f=lambda xc,yc,x,y,k,f:(k<=0)or (x*x+y*y\
+>=4.0) or 1+f(xc,yc,x*x-y*y+xc,2.0*x*y+yc,k-1,f):f(xc,yc,x,y,k,f):chr(\
+64+F(Ru+x*(Ro-Ru)/Sx,yc,0,0,i)),range(Sx))):L(Iu+y*(Io-Iu)/Sy),range(Sy\
+))))(-2.1, 0.7, -1.2, 1.2, 30, 80, 24)
+#    \___ ___/  \___ ___/  |   |   |__ lines on screen
+#        V          V      |   |______ columns on screen
+#        |          |      |__________ maximum of "iterations"
+#        |          |_________________ range on y axis
+#        |____________________________ range on x axis
+
+Don't try this at home, kids!
+
+
 
 5. Extending Python
 ===================
