Question

I want to write a function which gets all the variables in a scope, and then determines the
type of each variables.
I am a aware of vars(), dir() and similar, but these functions return a list of strings.
How can I actually get the types ?
I would like to do something like that:

 #this is just pseudo code
 for item in <items in scope>:
     if isinstance(item, someclass):
        del <item which belongs to someclass>

thanks in advance,
Oz

Answer 1

You may be looking for locals, which returns a dict with locals vars name and their values:

for name, value in locals().items():
     if isinstance(value, someclass):
        do something

OK, I am editing this answer, because it is the closest of what I want:
I wanted to erase all numpy array. I find it annoying that numpy does not have “clear all” a la octave\matlab, and ipython’s %reset is a bit too much …

so, here it is:
In [24]: anp=np.r_[1:10]

 In [25]: np.who()
 Name            Shape            Bytes            Type
 ===========================================================

 anp             9                36               int32

 Upper bound on total bytes  =       36

 In [26]: for name, value in locals().items():
 ....:     if isinstance(value, np.ndarray):
 ....:         print name
 ....:         print value
 ....:         del globals()[name]
 ....: 
 anp
 [1 2 3 4 5 6 7 8 9]

 In [27]: np.who()

 Upper bound on total bytes  =       0

Thanks for everyone, for the will and the effort!