del

Deleting a few list items inside of dictionary Hi, I have a dictionary: phone = {"first":100,"second":200,"third":[10,12,5,38],"fourth":400} Let' say I want to remove the 12 and 5 from from "phone" dictionary. Is there a way to do that using a "del" function? I know how to do this, using a .remove() phone["third"].remove(12) phone["third"].remove(5) but I was wondering if it is possible to do it using the del()? Thank you. EDIT: For all those replies concentrating on "del uses index, remove uses the exact value", I am redefining my question: I want to delete the indexes 1 and 2 in the list

I m trying to do a some activity on class obj destruction. How do I achive file open in _del__ function? (I m using Python 3.4) class iam(object): def __init__(self): print("I m born") def __del__(self): f = open("memory_report.txt", "w") f.write("He gone safe") f.close() if __name__ == '__main__': i = iam() print("Script Ends. Now to GC clean memory") Output: I m born Script Ends. Now to GC clean memory Exception ignored in: <bound method iam.__del__ of <__main__.iam object at 0x00000000022F1A58>> Traceback (most recent call last): File "F:\Kumaresan\Code\Python\CommonLib\src\kmxPyQt

I have read the python docs for list and how the del operators works, but I need explanation for the following behavior In this case, c and l points to the same object(list), so doing changes on one affects the other, but deleting one does not delete the object. So what happens here? Is it just the pointer to the list object is lost? >>> l = [1,2,3] >>> c = l >>> c.append(4) >>> c [1, 2, 3, 4] >>> l [1, 2, 3, 4] >>> del c >>> l [1, 2, 3, 4] >>> c Traceback (most recent call last): File "<stdin>", line 1, in <module> NameError: name 'c' is not defined Deletion by slice operation >>> l [1, 2, 3,

In Python, how do I delete a "column" from a list of lists? Given: L = [ ["a","b","C","d"], [ 1, 2, 3, 4 ], ["w","x","y","z"] ] I would like to delete "column" 2 to get: L = [ ["a","b","d"], [ 1, 2, 4 ], ["w","x","z"] ] Is there a slice or del method that will do that? Something like: del L[:][2] You could loop. for x in L: del x[2] If you're dealing with a lot of data, you can use a library that support sophisticated slicing like that. However, a simple list of lists doesn't slice. just iterate through that list and delete the index which you want to delete. for example for sublist in list:

link text I got the concept of reference count So when i do a "del astrd" ,reference count drops to zero and astrd gets collected by gc ? This is the sample codes.These codes I developed after my yesterday's question: link text one.py: def abc(): print "Hello" print "123" print '345' two.py: import one #reload(one) #def defg(): one.abc() three.py: import os,sys,gc from time import sleep import two #reload(two) #two.defg() sleep(20) directory = os.listdir('.') for filename in directory: if filename[-3:] == 'pyc': print '- ' + filename print sys.getrefcount(filename) file_name = os.path.splitext

Given a model, e.g. from gensim.models.word2vec import Word2Vec documents = ["Human machine interface for lab abc computer applications", "A survey of user opinion of computer system response time", "The EPS user interface management system", "System and human system engineering testing of EPS", "Relation of user perceived response time to error measurement", "The generation of random binary unordered trees", "The intersection graph of paths in trees", "Graph minors IV Widths of trees and well quasi ordering", "Graph minors A survey"] texts = [d.lower().split() for d in documents] w2v_model =

I'm working through a pluralsight course on gulp. John Papa is demonstrating how to inject a function that deletes existing css files, into the routine that compiles the new ones. The callback on the del function is not firing. The del function is running, file are deleted, I see no error messages. If I call the callback manually it executes, so looks like the function is in tact. So I am wondering what would cause del not to want to execute the callback. delete routine: function clean(path, done) { log('cleaning ' + path); del(path, done); // problem call } The 'done' function is not firing,