On Sun, Mar 17, 2013 at 1:23 AM, Mark Shroyer <mshro...@awaredigital.com> wrote:
> I realize this isn't yet precisely what you're asking for, but look at the
> inspect and ast modules:
>
> import ast, inspect
>
> def indent_level():
> lineno = inspect.currentframe().f_back.f_lineno
>
> with open(__file__) as source_file:
> tree = ast.parse(source_file.read(), filename=__file__)
>
> for node in ast.walk(tree):
> if hasattr(node, 'lineno') and node.lineno == lineno:
> return node.col_offset
>
> def example_usage():
> print("first indent_level() = {0}".format(indent_level()))
> if True:
> print("second indent_level() = {0}".format(indent_level()))
>
> if __name__ == '__main__':
> example_usage()
>
> The indent_level function above returns the textual column offset rather than
> the logical block level you're asking for, e.g.:
>
> first indent_level() = 4
> second indent_level() = 8
>
> But hopefully it's a start.
Thanks. I try to run it from stdin. Obviously, it does not work. The
problem is the stdin can not be read again. Is there a way to extend
the code that indentation can be computed even the code is from stdin?
~/linux/test/python/tricks/indent_level$ python - < main.py
Traceback (most recent call last):
File "<stdin>", line 23, in <module>
File "<stdin>", line 16, in example_usage
File "<stdin>", line 8, in indent_level
IOError: [Errno 2] No such file or directory: '<stdin>'
~/linux/test/python/tricks/indent_level$ cat main.py
#!/usr/bin/env python
import ast, inspect
def indent_level():
lineno = inspect.currentframe().f_back.f_lineno
with open(__file__) as source_file:
tree = ast.parse(source_file.read(), filename=__file__)
for node in ast.walk(tree):
if hasattr(node, 'lineno') and node.lineno == lineno:
return node.col_offset
def example_usage():
print indent_level()
#print("first indent_level() = {0}".format(indent_level()))
if True:
print indent_level()
#print("second indent_level() = {0}".format(indent_level()))
if __name__ == '__main__':
example_usage()
--
Regards,
Peng
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