Questions tagged [dict-comprehension]
13 questions
47
votes
6 answers
Dict merge in a dict comprehension
In python 3.5, we can merge dicts by using double-splat unpacking
>>> d1 = {1: 'one', 2: 'two'}
>>> d2 = {3: 'three'}
>>> {**d1, **d2}
{1: 'one', 2: 'two', 3: 'three'}
Cool. It doesn't seem to generalise to dynamic use cases, though:
>>> ds = [d1,…
wim
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3
votes
1 answer
if-else in a dictionary comprehension
Is it possible to use the else statement (and if yes, how?) in a dictcomp?
It is not possible to use else as part of the comprehension itself (see this) but at least in list and set comprehensions it is possible to use the conditional_expression…
LittleByBlue
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2
votes
1 answer
short for python dictionary
I tried a few searches but I didn't really know how to ask. I understand short form for loops but this portion within a dictionary is confusing me.
resistances = {k: v if random.random() > self.mutProb else
not v for k, v in…
Loz
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2
votes
1 answer
Multiply key of the same dict
I'm using python 3.5,
I need to multiply this dict and this should output the result of multiplication of each key of dict.
{0: [0.0008726003490401396, 0.004363001745200698, 0.0008726003490401396, 0.0008726003490401396, 0.0017452006980802793,…
Davide Di Menna
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- 8
1
vote
2 answers
Squeeze in an entry to a dictionary while creating the latter with enumerate function
Is there a way of writing the following on a single line?
x = {item: i for i, item in enumerate([letters for letters in ascii_lowercase])}
x[' '] = 27
I tried something like
x = {item: i for i, item in enumerate([letters for letters in…
cidetto
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1
vote
1 answer
Condensing the following code, preferably using a dictionary comprehension
Is it possible (and, more importantly, practical) to write the following code as a dict comprehension?
I am creating a dictionary here and then checking for "blank" values (represented by a '-') and replacing it with another string value.
test_dict…
Racchit Thapliyal
- 11
- 3
1
vote
1 answer
Nested dictionary comprehension to avoid empty values
I have an api call that returns a dictionary with all the ids for all users
and others to get the userDetails like:
>>> allIds=api.getAllIds()
{1,2,3,4,5}
>>> userDetails=api.getUserDetails(1)
{'name':'Bob','age':'19'}
I'm trying to pack the whole…
Juan
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- 3
1
vote
2 answers
Python dictionary comprehension with Pandas
I am trying to create a dictionary from two columns of a DataFrame (df)
mydict={x :y for x in df['Names'] for y in df['Births']}
But all of the values are the same(the last value in the column)!
{'Bob': 973, 'Jessica': 973, 'John': 973, 'Mary':…
AboJoe
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1
vote
3 answers
How to join two lists of dictionaries in Python?
I have the following simple data structures:
teams = [ { 'league_id': 1, 'name': 'Kings' }, { 'league_id': 1, 'name': 'Sharkls' }, { 'league_id': 2, 'name': 'Reign' }, { 'league_id': 2, 'name': 'Heat' } ]
leagues = [ { 'league_id': 1, 'name':…
Wells
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1
vote
1 answer
Making a nested dictionary with lists and arrays
I have two lists and an array:
owners = [ 'Bill', 'Ann', 'Sarah']
dog = ['shepherd', 'collie', 'poodle', 'terrier']
totals = [[5, 15, 3, 20],[3,2,16,16],[20,35,1,2]]
I want to make a nested dictionary out of these.
dict1 = {'Bill': {'shepherd':…
Caroline.py
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0
votes
2 answers
Python: How to create nested dictionaries out of lists with specific values
I apologize in advance for the long post, but I've made sure it's easy to follow and very clear.
My question is this:
How can I create a nested dictionary out of lists, with specified duplicate keys?
Here's an example of what I'd like to make,…
Jaiden DeChon
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-1
votes
1 answer
How do you build a nested dict comprehension that imitates 'records' made by '.to_dict'?
I have read a CSV file into Pandas and converted the resulting dataframe into a list of dictionaries for each row using the 'to_dict(orient='records') function. A shortened version of the list looks like this:
records = [{'addjob': 'ADDJOB',
…
Marc Lawson
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-5
votes
3 answers
Python - convert list to dict
I have the following list:
l = [('Alice',12),('Bob',10),('Celine',11)]
I want to get the following dict (as correctly pointed in a comment below, this is not a dict. In reality, I just want a list of dicts):
[
{'name':'Alice','age':12},
…
Nik
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