Imagine that you have:
keys = ('name', 'age', 'food')
values = ('Monty', 42, 'spam')
What is the simplest way to produce the following dictionary ?
dict = {'name' : 'Monty', 'age' : 42, 'food' : ...
|
Imagine I have these python lists:
keys = ['name', 'age']
values = ['Monty', 42, 'Matt', 28, 'Frank', 33]
Is there a direct or at least a simple way to produce the following list of ... |
Given a dictionary like so:
map = { 'a': 1, 'b':2 }
How can one invert this map to get:
inv_map = { 1: 'a', 2: 'b' }
|
I am working on a program that (among other things) reads a CSV file in (it gets stored as an array of dicts in the form [{col1:data1a,col2:data2a},{col1:data1b,col2:data2b}] ). For each row, ... |
Sometimes it makes sense to have a key-ordered dictionary. In C++, this is often implemented with a Red-black tree. But any self-balancing binary search tree will do (fwiw, Knuth is particularly ... |
Fellows:
A Python dictionary is stored in no particular order (mappings have no order), e.g.,
>>> myDict = {'first':'uno','second':'dos','third':'tres'}
myDict = {'first':'uno','second':'dos','third':'tres'}
>>> myDict
myDict
{'second': 'dos', 'third': 'tres', 'first': 'uno'}
While it is possible to retrieve a ... |
I have a list of dictionaries that have the same keys within eg:
[{k1:'foo', k2:'bar', k3...k4....}, {k1:'foo2', k2:'bar2', k3...k4....}, ....]
I'm trying to delete k1 from all dictionaries within the list.
I tried
map(lambda x: ...
|
|
Is there a way to map a list onto a dictionary? What I want to do is give it a function that will return the name of a key, and the ... |
I would like to be able to make a Python dictionary with strings as keys and sets of strings as the values. E.g.: { "crackers" : ["crunchy", "salty"] } It must ... |
I have a question related to understanding of how python dictionaries work.
I remember reading somewhere strings in python are immutable to allow hashing, and it is the same reason why ... |
I have the following input:
input = [(dog, dog, cat, mouse), (cat, ruby, python, mouse)]
and trying to have the following output:
outputlist = [[0, 0, 1, 2], [1, 3, 4, 2]]
outputmapping = {0:dog, ...
|
If I have a dictionary named ref as follows
ref = {}
ref["abc"] = "def"
I can get "def" from "abc"
def mapper(from):
return ref[from]
But, how can I get from "def" ... |
I am using Python 2.6 and I have two data stores. Querying the first one returns a list of document IDs in a specific order. I look up all the documents ... |
I would like to perform an operation on an argument based on the fact that it might be a map-like object or a sequence-like object. I understand that no strategy is ... |
I am having some problems with mapping characters to a dictionary. What I am going for is
counter = { '!': 0, '"': 0, '#': 0, '$': 0 } ...
For all ... |
I have a working .net web service that is being called by a Linux client written in Python. They are sending me a map dictionary element to my method.
I have ... |
I have dictionary like
d = {'user_id':1, 'user':'user1', 'group_id':3, 'group_name':'ordinary users'}
and "mapping" dictionary like:
m = {'user_id':'uid', 'group_id':'gid', 'group_name':'group'}
All i want to "replace" keys in first dictionary with keys from second (e.g. replace ... |
I have the following function:
def heading_positions(self):
return map(
lambda h:
...
|
I'd like to get PyYAML's loader to load mappings (and ordered mappings) into the Python 2.7+ OrderedDict type, instead of the vanilla dict and list of pairs ... |
I am currently building a location-based service that calculates routes for users sharing cars to a specific event. In order to calculate the shortest distance, the driving distances between the users ... |
Is dictionary in Python can be seen as Map in C++
And the insert complexity is constant time?
and what about sort complexity of dictionary?
What about iteration?
Need some good points or link to ... |
I would like to have a map data type for one of my entity types in my python google app engine application. I think what I need is essentially the python ... |
I have a python dict as below
mymap={'java':40,'haskell':60,'ruby':50,'python':70,'scala':30,'lisp':80,'scheme':75}
I have the keys put in sublists
mapkeys = [['haskell','java'],['lisp','python'],['scala','scheme'],['ruby']]
Now,I need to create a list of lists of values of these keys as below
[[60,40],[80,70],[30,75],[50] ]
I tried ... |
My problem is how to map dictionary values to row indices. I have a dictionary like:
ordered_dict = OrderedDict(1:"id", 2:"name", 3:"address", 4:"salary")
And I got rows from a select query like:
row = ["David", ...
|
I tried this example and it worked fine: Map two lists into a dictionary in Python
But if I replaced "keys" with this list:
['2', '3', '2', '3', '4', '2', '4', ... |
I want to know which would be an efficient method to invert dictionaries in python. I also want to get rid of duplicate values by comparing the keys and choosing the ... |
Something I miss about C++ std::map (which is a sorted dictionary) is that looking up a key returns an iterator pointing to the correct location in the map. This means you ... |
Assume we have dictionary that translates strings into numbers.
How to reverse it into list ?
Let assume, we can fill not mapped numbers with empty string ''.
Here example how it works:
>>> dic_into_list({'x':0, ...
|
def parse_actor_data(actor_data):
while 1:
line = actor_data.readline().strip()
if line.count('-') > 5:
...
|
|
I am searching for a way to map a folder (with all of its subfolders) in a nested dictionary, with file names and folder names as dict keys. Actually, I am trying os.walk(). However, I am not able to get the right position for the output from os.walk()... Now I wonder whether there is already a piece of code that solves ... |