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Python Data Type Q&A » List » key 

1. Configuration file with list of key-value pairs in python    stackoverflow.com

I have a python scripts that analyzes a set of error messages and checks for each message if it matches a certain pattern (regular expression) in order to group these messages. ...

2. Best way to turn a list into a dict, where the keys are a value of each object?    stackoverflow.com

I am attempting to take a list of objects, and turn that list into a dict. The dict values would be each object in the list, and the dict keys would ...

3. How to create single Python dict from a list of dicts by summing values with common keys?    stackoverflow.com

I have a list of dictionaries, e.g:

dictList = [
    {'a':3, 'b':9, 'c':4},
    {'a':9, 'b':24, 'c':99},
    {'a':10, 'b':23, 'c':88}
]
All the dictionaries have the ...

4. How to delete all the items of a specific key in a list of dicts?    stackoverflow.com

I'm trying to remove some items of a dict based on their key, here is my code:

d1 = {'a': 1, 'b': 2}
d2 = {'a': 1}

l = [d1, d2, d1, d2, d1, ...

5. Combine two lists: aggregate values that have similar keys    stackoverflow.com

I have two lists or more than . Some thing like this:

listX = [('A', 1, 10), ('B', 2, 20), ('C', 3, 30), ('D', 4, 30)]
listY = [('a', 5, 50), ('b', 4, ...

6. Sort a multidimensional list by a variable number of keys    stackoverflow.com

I've read this post and is hasn't ended up working for me. Edit: the functionality I'm describing is just like the sorting function in Excel... if that makes it any clearer Here's ...

7. gqlQuery returns object, want list of keys    stackoverflow.com

Is there a way to convert the GqlQuery object to an array of keys, or is there a way to force the query to return an array of keys? ...

8. Pythonic way to sort list of objects by a dict value (by key) contained within the object    stackoverflow.com

I'm seeking advice on doing the following in a more pythonic way. Consider:

class MyObj(object):
    def __init__(self):
        self.dict_properties = {}
Suppose I've got a ...

9. Python - Access a class from a list using a key    stackoverflow.com

Is there any way to make a list of classes behave like a set in python? Basically, I'm working on a piece of software that does some involved string comparison, and I ...

10. Need help sorting list of objects by key    stackoverflow.com

I am unable to get this code to sort a list of objects using either .sort() or sorted(). What am I missing here? P.S. My solution.distance() method could use some cosmetic ...

11. How best to get map from key list/value list in groovy?    stackoverflow.com

In python, I can do the following:

keys = [1, 2, 3]
values = ['a', 'b', 'c']
d = dict(zip(keys, values))

assert d == {1: 'a', 2: 'b', 3: 'c'}
Is there a nice way to ...

12. Understanding __call__ and list.sort(key)    stackoverflow.com

I have the following code I am trying to understand:

>>> class DistanceFrom(object):
        def __init__(self, origin):
          ...

13. Intersect a list of dicts based on a common key    stackoverflow.com

Let's say I have two list of dicts:

dates = [{'created':'2010-12-01'},{'created':'2010-12-02'},....]
elts = [{'created':'2010-12-01', 'key1':'val1', 'key2':'val2'}, {'created':'2010-12-05','key1':'val1'}]
The dates list is a bunch of contiguous dates. The elts list can be anywhere from 1 to ...

14. App Engine: prefetch_refprops-like function for resolving lists of keys    stackoverflow.com

When dealing with ReferenceProperties I often make use a function called prefetch_reprops to efficiently resolve references. However, I am currently dealing with a model that makes use of a list of ...

15. How to get a list of key names in Python/Google app engine?    stackoverflow.com

In Python/Google app engine, I'd like to store a property as a key name in order to save resources and speed things up. But I don't know how to get ...

16. Reference list item as key in sorted for loop    stackoverflow.com

Sorry for boring question but I can't figure this out:

for f in sorted(os.listdir('.')): print f
Output:
p1.html
p10.html
p11.html
p12.html
p13.html
p14.html
p15.html
p16.html
p17.html
p18.html
p19.html
p2.html
p20.html
p21.html
p22.html
p3.html
p4.html
...
Obviously I want to sort by number and I can do it with this key: f.split('.')[0][1:] but ...

17. Using python how to find elements in a list of lists based based on a key that is an element of the inner list?    stackoverflow.com

Suppose I have a list of lists or a list of tuples, whichever can solve my problem more efficiently. Eg:

student_tuples = [
    ('john', 'A', 15),
    ...

18. Get a list of all shortcuts from another application    stackoverflow.com

I'm wondering if there's a straightforward way of getting a list of all keyboard shortcuts present in the menubar of an other application (if possible also from closed applications). I'd like to ...

19. python loop through list starting at key    stackoverflow.com

in Python how do i loop through list starting at a key and not the beginning. e.g.

l = ['a','b','c','d']
loop through l but starting at b e.g. l[1]

20. Getting method arguments into a list of key and value pairs    stackoverflow.com

I'm looking to get each of my method parameters into a dictionary or tuple pairs in a list as later the arguments get put through urllib.urlencode and formed into a POST ...

21. Getting a list value from key/value pair    stackoverflow.com

If I have a list with key/value pair, how do I get the value of the key? I'm working with this code snippet:

>>> items = {'fees':[('status','pending'), ('timeout',60)], 'hostel':[('status',
 'pending'), ('timeout','120')]}
>>> print [items[i] ...

22. Python: How to sort a list of objects using attrgetter with case insensitivity    stackoverflow.com

self.data = sorted(self.data, key=attrgetter('word'))
self.data is a list of Word objects. Word objects have 'word', 'definition', 'example' and 'difficulty' attributes. I want to sort by the 'word' strings of each Word object, ...

23. hadoop streaming : how to give list of key values to reducer?    stackoverflow.com

so when we use Java for writing map/reduce program, the map collects the data and reducer receives the list of values per key, like

Map(k, v) -> k1, v1  
  ...

24. make list python have key pair    stackoverflow.com

I have

list('327VUQ56156TX374');
['3', '2', '7', 'V', 'U', 'Q', '5', '6', '1', '5', '6', 'T', 'X', '3', '7', '4']
I want to get the array associative like this , its index.[ 1=>'3',... 16=>'4' ...

25. GAE entity relationships: ancestor vs. reference prop. vs. list of keys    stackoverflow.com

I'm working on a GAE Python app for running elections. I have an Election entity for each election. Each election will have around 2-20 candidates and I have a ...

26. Why can't I access a list by its key in Python?    stackoverflow.com

I am creating a list, and then accessing an element like this:

list = []
list.insert(42, "foo") 
list.insert(43, "bar") 
list.insert(44, "baz")

print(list[43])
And I have the folowing error:
print(list[43]) IndexError: list index out of ...

27. Removing a key in a dict if found in a given list    python-forum.org

Hi, im new to python and ive tried a variation of things for this questions from pop() to popitem() to del and i stil cant seem to get the right result=S this is the question: Given a dictionary d and a list lst, remove all elements from the dictionary whose key is an element of lst. For example, given the dictionary ...

28. Returning a list of keys or values    python-forum.org

The Python version difference is what's causing this. Earlier Python versions used to return a list to the methods .keys() and .values() while Python 3.0 and above return an iterator. You'll only be able to tell what's going on here once you learn about iterators -- and those are pretty far down the list of topics of any tutorial... I always ...

29. How to return Dict with sorted key and list[values]    python-forum.org

Good Day. I created function that will print Dict with sorted keys and list[values} I am having problem modifying this function to return a Dict ( can be copy of original one) please see my last two commented lines. Code: Select all def isExactlyAList(anobj): return type(anobj) is type([]) def dict_Sorted_Key_and_Value1(d1): d2={} lq=[] ...

30. Access the key of a list    python-forum.org

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