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copied!<p>Modify program like this to inspect bytecode :</p> <pre><code>import time import dis import inspect def create_dict(): return {x:[x]*125 for x in xrange(0, 100000)} class Foo(object): @staticmethod def dict_init(): start = time.clock() Foo.sample_dict = create_dict() print "dict_init in Foo took {0} sec".format(time.clock() - start) dis.dis(inspect.currentframe().f_code) if __name__ == '__main__': Foo.dict_init() for x in xrange(0, 1): start = time.clock() create_dict() print "Run {0} took {1} seconds".format(x, time.clock() - start) dis.dis(inspect.currentframe().f_code) </code></pre> <p>Here is the output :</p> <pre><code>dict_init in Foo took 0.44164 sec 12 0 LOAD_GLOBAL 0 (time) 3 LOAD_ATTR 1 (clock) 6 CALL_FUNCTION 0 9 STORE_FAST 0 (start) 13 12 LOAD_GLOBAL 2 (create_dict) 15 CALL_FUNCTION 0 18 LOAD_GLOBAL 3 (Foo) 21 STORE_ATTR 4 (sample_dict) 14 24 LOAD_CONST 1 ('dict_init in Foo took {0} sec') 27 LOAD_ATTR 5 (format) 30 LOAD_GLOBAL 0 (time) 33 LOAD_ATTR 1 (clock) 36 CALL_FUNCTION 0 39 LOAD_FAST 0 (start) 42 BINARY_SUBTRACT 43 CALL_FUNCTION 1 46 PRINT_ITEM 47 PRINT_NEWLINE 15 48 LOAD_GLOBAL 6 (dis) 51 LOAD_ATTR 6 (dis) 54 LOAD_GLOBAL 7 (inspect) 57 LOAD_ATTR 8 (currentframe) 60 CALL_FUNCTION 0 63 LOAD_ATTR 9 (f_code) 66 CALL_FUNCTION 1 69 POP_TOP 70 LOAD_CONST 0 (None) 73 RETURN_VALUE Run 0 took 0.641144 seconds 1 0 LOAD_CONST 0 (-1) 3 LOAD_CONST 1 (None) 6 IMPORT_NAME 0 (time) 9 STORE_NAME 0 (time) 2 12 LOAD_CONST 0 (-1) 15 LOAD_CONST 1 (None) 18 IMPORT_NAME 1 (dis) 21 STORE_NAME 1 (dis) 3 24 LOAD_CONST 0 (-1) 27 LOAD_CONST 1 (None) 30 IMPORT_NAME 2 (inspect) 33 STORE_NAME 2 (inspect) 5 36 LOAD_CONST 2 (<code object create_dict at 0x1091396b0, file "dict.py", line 5>) 39 MAKE_FUNCTION 0 42 STORE_NAME 3 (create_dict) 9 45 LOAD_CONST 3 ('Foo') 48 LOAD_NAME 4 (object) 51 BUILD_TUPLE 1 54 LOAD_CONST 4 (<code object Foo at 0x10914c130, file "dict.py", line 9>) 57 MAKE_FUNCTION 0 60 CALL_FUNCTION 0 63 BUILD_CLASS 64 STORE_NAME 5 (Foo) 17 67 LOAD_NAME 6 (__name__) 70 LOAD_CONST 5 ('__main__') 73 COMPARE_OP 2 (==) 76 POP_JUMP_IF_FALSE 186 18 79 LOAD_NAME 5 (Foo) 82 LOAD_ATTR 7 (dict_init) 85 CALL_FUNCTION 0 88 POP_TOP 19 89 SETUP_LOOP 94 (to 186) 92 LOAD_NAME 8 (xrange) 95 LOAD_CONST 6 (0) 98 LOAD_CONST 7 (1) 101 CALL_FUNCTION 2 104 GET_ITER >> 105 FOR_ITER 74 (to 182) 108 STORE_NAME 9 (x) 20 111 LOAD_NAME 0 (time) 114 LOAD_ATTR 10 (clock) 117 CALL_FUNCTION 0 120 STORE_NAME 11 (start) 21 123 LOAD_NAME 3 (create_dict) 126 CALL_FUNCTION 0 129 POP_TOP 22 130 LOAD_CONST 8 ('Run {0} took {1} seconds') 133 LOAD_ATTR 12 (format) 136 LOAD_NAME 9 (x) 139 LOAD_NAME 0 (time) 142 LOAD_ATTR 10 (clock) 145 CALL_FUNCTION 0 148 LOAD_NAME 11 (start) 151 BINARY_SUBTRACT 152 CALL_FUNCTION 2 155 PRINT_ITEM 156 PRINT_NEWLINE 23 157 LOAD_NAME 1 (dis) 160 LOAD_ATTR 1 (dis) 163 LOAD_NAME 2 (inspect) 166 LOAD_ATTR 13 (currentframe) 169 CALL_FUNCTION 0 172 LOAD_ATTR 14 (f_code) 175 CALL_FUNCTION 1 178 POP_TOP 179 JUMP_ABSOLUTE 105 >> 182 POP_BLOCK 183 JUMP_FORWARD 0 (to 186) >> 186 LOAD_CONST 1 (None) 189 RETURN_VALUE </code></pre> <p>Maybe it is the difference in the format of the string that is causing the difference when garbage collection is off.</p>

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