1 # Obtain a list computed by range. 2 3 l = range(0, 10) 4 print l # [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] 5 print len(l) # 10 6 7 # Test a descending xrange. 8 9 x = xrange(0, -10, -2) 10 print x # __builtins__.span.xrange(0, -10, -2) 11 print len(x) # 5 12 13 for i in x: 14 print i # 0 15 # -2 16 # -4 17 # -6 18 # -8 19 20 # Test an empty xrange. 21 22 x = xrange(0, -10, 2) 23 print x # __builtins__.span.xrange(0, 0, 2) 24 print len(x) # 0 25 26 # Test a simple ascending xrange. 27 28 y = xrange(4, 8) 29 print y # __builtins__.span.xrange(4, 8, 1) 30 31 # Test enumerate and sum. 32 33 print enumerate(y) # [(0, 4), (1, 5), (2, 6), (3, 7)] 34 print sum(y) # 22 35 36 # Test map and filter using lambdas. 37 38 print map(lambda x: x*2, y) # [8, 10, 12, 14] 39 print filter(lambda x: x%2, y) # [5, 7] 40 41 # Test the limits of the range. 42 43 print max(y) # 7 44 print min(y) # 4 45 46 # Reproduce the sum function using reduce and a lambda. 47 48 print reduce(lambda x, y: x+y, y) # 22 49 print reduce(lambda x, y: x+y, y, 0) # 22 50 51 # Test a single element range. 52 53 single = xrange(3, 5, 2) 54 print list(single) # [3] 55 print reduce(lambda x, y: x+y, single) # [3] 56 57 # Test a double element range. 58 59 double = xrange(3, 5, 1) 60 print list(double) # [3, 4] 61 print reduce(lambda x, y: x+y, double) # [7]
