Re: [Tutor] Getting import to use a variable name
On 20 May 2015 at 01:02, Peter Otten __pete...@web.de wrote: If you start with an object dir() gives you a list of attribute names. To get the actual attributes use attribute = getattr(object, attribute_name) Then print the attributes' docstring with print(attribute_name, attribute.__doc__) Thanks. That will save a lot of scrolling - and saving scrolling and typing is half the battle ;') -- Jim ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Getting import to use a variable name
On 20/05/15 09:02, Peter Otten wrote: $ python3 -i shorthelp.py shorthelp(whatever) No module named 'whatever' shorthelp(42) int(x=0) - integer --- bit_length int.bit_length() - int conjugateReturns self, the complex conjugate of any int. denominator int(x=0) - integer ... shorthelp(pwd) This module provides access to the Unix password database. -- getpwall getpwall() - list_of_entries getpwnam getpwnam(name) - (pw_name,pw_passwd,pw_uid, getpwuid getpwuid(uid) - (pw_name,pw_passwd,pw_uid, Thats pretty cool Peter. I can see me using that pretty often. I think I'll be stealing that for my collection of useful tools. :-) Kudos to Jim for the concept too. -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ http://www.amazon.com/author/alan_gauld Follow my photo-blog on Flickr at: http://www.flickr.com/photos/alangauldphotos ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Getting import to use a variable name
Jim Mooney Py3.4.3winXP wrote:
On 19 May 2015 at 17:25, Jim Mooney Py3.4.3winXP
cybervigila...@gmail.com wrote:
If I can get dir to accept x I can parse the output to get rid of the
__xxx stuff and print it out.
By that I mean dir will give me a list of strings I can then use __doc__
on to get all useful help items.
If you start with an object dir() gives you a list of attribute names. To
get the actual attributes use
attribute = getattr(object, attribute_name)
Then print the attributes' docstring with
print(attribute_name, attribute.__doc__)
The complete example:
$ cat shorthelp.py
import importlib
def first_line(s):
if s is None:
return (NO HELP AVAILABLE)
return s.splitlines()[0]
def shorthelp(obj):
if isinstance(obj, str):
# if obj is a string, assume it's a module name
try:
obj = importlib.import_module(obj)
except BaseException as err:
# we really don't want to exit on error
print(err)
return
# documentation for obj
objdoc = first_line(obj.__doc__)
if objdoc:
print(objdoc)
print(- * len(objdoc))
# documentation for the attributes of obj
names = [name for name in dir(obj) if not name.startswith(_)]
width = max(len(name) for name in names)
for name in names:
print({:{}} {}.format(
name, width,
first_line(getattr(obj, name).__doc__)))
$ python3 -i shorthelp.py
shorthelp(whatever)
No module named 'whatever'
shorthelp(42)
int(x=0) - integer
---
bit_length int.bit_length() - int
conjugateReturns self, the complex conjugate of any int.
denominator int(x=0) - integer
from_bytes int.from_bytes(bytes, byteorder, *, signed=False) - int
imag int(x=0) - integer
numeratorint(x=0) - integer
real int(x=0) - integer
to_bytes int.to_bytes(length, byteorder, *, signed=False) - bytes
shorthelp(pwd)
This module provides access to the Unix password database.
--
getpwall getpwall() - list_of_entries
getpwnam getpwnam(name) - (pw_name,pw_passwd,pw_uid,
getpwuid getpwuid(uid) - (pw_name,pw_passwd,pw_uid,
struct_passwd pwd.struct_passwd: Results from getpw*() routines.
shorthelp(grp)
Traceback (most recent call last):
File stdin, line 1, in module
NameError: name 'grp' is not defined
import grp
shorthelp(grp)
Access to the Unix group database.
--
getgrall getgrall() - list of tuples
getgrgid getgrgid(id) - tuple
getgrnam getgrnam(name) - tuple
struct_group grp.struct_group: Results from getgr*() routines.
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Re: [Tutor] Getting import to use a variable name
Jim Mooney Py3.4.3winXP cybervigila...@gmail.com writes: I can only use the hardcoded imported module name, shutil in this case. If I try x = anothermodule, then import x, it doesn't work. Can you show an example of Python code that you would like to work? I am *guessing* you mean you want this to work:: foo = 'barmodule' import foo That doesn't work because the ‘import’ statement requires the name directly in the source, not as a string value. You will be pleased to know of the standard library ‘importlib’ library:: import importlib foo = 'barmodule' importlib.import_module(foo) See the documentation for ‘importlib’ for more on this useful library URL:https://docs.python.org/3/library/importlib. -- \“The restriction of knowledge to an elite group destroys the | `\ spirit of society and leads to its intellectual | _o__)impoverishment.” —Albert Einstein | Ben Finney ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Getting import to use a variable name
On 19 May 2015 at 17:18, Ben Finney ben+pyt...@benfinney.id.au wrote: You will be pleased to know of the standard library ‘importlib’ library:: import importlib Yes, I already got importlib to accept a string. But I can't figure how to get dir to accept it: x = 'shutil' import importlib importlib.__import__(x) module 'shutil' from 'C:\\Python34\\lib\\shutil.py' If I can get dir to accept x I can parse the output to get rid of the __xxx stuff and print it out. -- Jim After not doing dishes for a week and washing spoon after spoon, fork after fork, knife after knife - I suddenly understand the mathematical concept of infinity, which is just one more damn thing after another. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Getting import to use a variable name
On 19 May 2015 at 17:25, Jim Mooney Py3.4.3winXP cybervigila...@gmail.com wrote: If I can get dir to accept x I can parse the output to get rid of the __xxx stuff and print it out. By that I mean dir will give me a list of strings I can then use __doc__ on to get all useful help items. -- Jim After not doing dishes for a week and washing spoon after spoon, fork after fork, knife after knife - I suddenly understand the mathematical concept of infinity, which is just one more damn thing after another. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
