Hi, I ran into a funny thing when I played with the python parser, to
build a python call graph for learning...
When I have a (special) python program, that runs without any error it
gives an error, when I try to parse it parser.suite. The error is,
when my program has a comment on the last line after an indented
block. Note that there no newline behind "# comment". With a newline
everything is fine.
For example:
#!/usr/bin/env python
from parser import suite, ast2list
fh = file(__file__)
s = fh.read()
fh.close()
ast = suite(s)
while False:
print "hello world"
# comment
Looks like a little bug in parser; but what I don't understand is that
I thought parser was build with the current syntax of python.
So, why can python run the script (an it can if you comment out the
line "ast = suite(s)") but parser can't?
Looking forward for answers...
Ludwig
3  1000 
Ludwig Miniatur wrote:
For example:
#!/usr/bin/env python
from parser import suite, ast2list
fh = file(__file__)
s = fh.read()
fh.close()
ast = suite(s)
while False:
print "hello world"
# comment
Looks like a little bug in parser; but what I don't understand is that
I thought parser was build with the current syntax of python.
I didn't read the grammar but I assume that Python grammar requires a
comment to have the form #.*<end-of-line>.
>
So, why can python run the script (an it can if you comment out the
line "ast = suite(s)") but parser can't?
The interpreter probably appends a newline after the input stream as a
friendly service :)
--
Joe
En Tue, 20 May 2008 16:22:10 -0300, Joe P. Cool
<jo********@googlemail.comescribió:
Ludwig Miniatur wrote:
>For example:
#!/usr/bin/env python
from parser import suite, ast2list
fh = file(__file__)
s = fh.read()
fh.close()
ast = suite(s)
while False:
print "hello world"
# comment
Looks like a little bug in parser; but what I don't understand is that
I thought parser was build with the current syntax of python.
I didn't read the grammar but I assume that Python grammar requires a
comment to have the form #.*<end-of-line>.
>>
So, why can python run the script (an it can if you comment out the
line "ast = suite(s)") but parser can't?
The interpreter probably appends a newline after the input stream as a
friendly service :)
Something like that. The last line of source *must* end in a newline (be
it a comment or not); this is a known limitation. See py_compile.py for an
example.
--
Gabriel Genellina
On 21 Mai, 00:12, "Gabriel Genellina" <gagsl-...@yahoo.com.arwrote:
En Tue, 20 May 2008 16:22:10 -0300, Joe P. Cool
<joe.p.c...@googlemail.comescribió:
Ludwig Miniatur wrote:
For example:
#!/usr/bin/env python
from parser import suite, ast2list
fh = file(__file__)
s = fh.read()
fh.close()
ast = suite(s)
while False:
print "hello world"
# comment
Looks like a little bug in parser; but what I don't understand is that
I thought parser was build with the current syntax of python.
I didn't read the grammar but I assume that Python grammar requires a
comment to have the form #.*<end-of-line>.
So, why can python run the script (an it can if you comment out the
line "ast = suite(s)") but parser can't?
The interpreter probably appends a newline after the input stream as a
friendly service :)
Something like that. The last line of source *must* end in a newline (be
it a comment or not); this is a known limitation. See py_compile.py for an
example.
--
Gabriel Genellina
Uoh, you never stop learning...
Thanks for the explanation. I thought something like that, but it made
me some headaches.
Lutz This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics
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