On 26 May 2013 17:20, Steven D'Aprano <st...@pearwood.info> wrote:
> On 27/05/13 07:40, Jim Mooney wrote:
>
>> Good to know that compile doesn't check syntax, since I erroneously
>> thought it did.
>
>
> compile does check syntax.
I'm unclear on something. The code below creates bytecode and I don't
see an error message unless I also tack exec code on the end of it. It
has the dumb error of trying to iterate an integer.
from dis import dis
code = compile(
'''a, b = 5, 8
print a
print b
for x in a:
print x
''','', 'exec'
)
dis(code)
Result below - bytecode but no error message
Python 2.7.5 (default, May 15 2013, 22:43:36) [MSC v.1500 32 bit (Intel)]
Type "help", "copyright", "credits" or "license" for more information.
[evaluate derek.py]
1 0 LOAD_CONST 3 ((5, 8))
3 UNPACK_SEQUENCE 2
6 STORE_NAME 0 (a)
9 STORE_NAME 1 (b)
2 12 LOAD_NAME 0 (a)
15 PRINT_ITEM
16 PRINT_NEWLINE
3 17 LOAD_NAME 1 (b)
20 PRINT_ITEM
21 PRINT_NEWLINE
4 22 SETUP_LOOP 19 (to 44)
25 LOAD_NAME 0 (a)
28 GET_ITER
>> 29 FOR_ITER 11 (to 43)
32 STORE_NAME 2 (x)
5 35 LOAD_NAME 2 (x)
38 PRINT_ITEM
39 PRINT_NEWLINE
40 JUMP_ABSOLUTE 29
>> 43 POP_BLOCK
>> 44 LOAD_CONST 2 (None)
47 RETURN_VALUE
If I add exec code to the end of that program I Do get an error,
after it prints a and b, but that's separate from the compile
statement:
exec code
Traceback (most recent call last):
File "C:\Program Files (x86)\Wing IDE 101
4.1\src\debug\tserver\_sandbox.py", line 13, in <module>
File "C:\Program Files (x86)\Wing IDE 101
4.1\src\debug\tserver\_sandbox.py", line 4, in <module>
#print 'Exiting sandbox process'
TypeError: 'int' object is not iterable
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