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1. Top results related to is a list of keyvaluepair a dictionary?

   • Is there a Pythonic way of adding float values of one dictionary to a list of values in another dictionary?

     Top Answer

     Answered Feb 21, 2021 · 6 votes

     Use dictionary comprehension

     { k: [x + dictB.get(k,0) for x in l] for k, l in dictA.items() }-

     Output

     {20: [0.9, 1.4, 0.9], 25: [1.0, 1.5, 1.0]}

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     1/5

   • Is it better to store data in a list of tuples or a dictionary?

     Top Answer

     Answered Oct 11, 2013 · 4 votes

     If you are trying to associate something to something else, then a dictionary is probably what you want. It is faster, and, well, the right tool for the job.

     Example usage:

     dictionary = {'o': (5.3, 7), 'k': (5, 9.2)} # Don't use dict as a variable name, it's a built-in-print(dictionary['o'])# (5.3, 7)print(dictionary['k'][1]))# 9.2

     I have replaced your lists with tuples. This saves a bit of memory (presuming you don't want to in the future associate different numbers with the letters.

     However, a dictionary would not preserve the order of the letters, but it doesn't seem like you need this.

     Although if all you need to do is check if a number is associated with a letter, you could optimize further, and use sets.

     dictionary = {'o': {5.3, 7}, 'k': {5, 9.2}}-print(7 in dictionary['o'])# True

     However, sets don't preserve ordering.

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     2/5

   • Check if a word is in a list that is a value of a dictionary

     Top Answer

     Answered Dec 03, 2017 · 3 votes

     Your code checks if element ('noodles') is a value in the dictionary, and it isn't (the values are lists).

     You need to check if element is inside every list.

     If you don't care for the key:

     print(any(element in value for value in myDict.values()))-

     If you want to know the key (this will print a list of matching keys):

     print([key for key, value in myDict.items() if element in value])-

     But, generally speaking, if you find yourself having to loop over a dictionary over and over again, you either made a bad choice for what are the keys, or using the wrong data structure altogether.

     Other Answers

     Answered Dec 03, 2017 · 1 votes

     The dict.values() call here returns an iterable of lists. You'll need to flatten the returned iterable first, to test directly:

     from itertools import chain-element = 'noodles'print(element in chain.from_iterable(my_dict.values())) # -> True

     Other Answers

     Answered Dec 03, 2017 · 1 votes

     You should use a function here , You can do with pure python without importing any module or making it more complicated :

     Data:

     Your_dict={1:['hello', 'hallo', 'salut', 'ciao', 'hola'], 2:['eggs', 'noodles', 'bacon']}your_word='noodles'

     code:

     def find(dict_1,word): for words in dict_1.values(): if word in words: return True else: return Falseprint(find(Your_dict,your_word))

     output:

     True-

     One line solution without any for loop or module :

     Just for fun

     print(list(map(lambda x:x if your_word in x else None,Your_dict.values())))-

     output:

     [None, ['eggs', 'noodles', 'bacon']]-

     Check all answers on Stack Overflow

     3/5

   • dictionary containing a list of dictionaries

     Top Answer

     Answered Aug 03, 2018 · 2 votes

     When you initialize a, I would approach it like this:

     a = {}-b=[]c={"Name":"Claude","Surname":"Verde","Age":"35","City":"Paris"}b.append(c)c={"Name":"Jean","Surname":"Claude","Age":"22","City":"Paris"}b.append(c)c={"Name":"Sam","Surname":"Smith","Age":"42","City":"London"}b.append(c)c={"Name":"James","Surname":"Jones","Age":"44","City":"London"}b.append(c)for i in range(len(b)): if b[i]['City'] not in a.keys(): a[b[i]['City']] = []for i in range(len(b)): a[b[i]['City']].append(b[i]])

     As a note: I'm pretty sure you can combine those for loops like this:

     for i in range(len(b)): if b[i]['City'] not in a.keys(): a[b[i]['City']] = [] a[b[i]['City']].append(b[i]])-

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     4/5

   • When would you use a List > instead of a Dictionary ?

     Top Answer

     Answered Nov 20, 2009 · 88 votes

     When you don't need fast lookups on key - maintaining the hashtable used by Dictionary has a certain overhead.

     Other Answers

     Answered Dec 03, 2017 · 1 votes

     The dict.values() call here returns an iterable of lists. You'll need to flatten the returned iterable first, to test directly:

     from itertools import chain-element = 'noodles'print(element in chain.from_iterable(my_dict.values())) # -> True

     Other Answers

     Answered Dec 03, 2017 · 1 votes

     You should use a function here , You can do with pure python without importing any module or making it more complicated :

     Data:

     Your_dict={1:['hello', 'hallo', 'salut', 'ciao', 'hola'], 2:['eggs', 'noodles', 'bacon']}your_word='noodles'

     code:

     def find(dict_1,word): for words in dict_1.values(): if word in words: return True else: return Falseprint(find(Your_dict,your_word))

     output:

     True-

     One line solution without any for loop or module :

     Just for fun

     print(list(map(lambda x:x if your_word in x else None,Your_dict.values())))-

     output:

     [None, ['eggs', 'noodles', 'bacon']]-

     Check all answers on Stack Overflow

     5/5

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2. devcodef1.com › news › 1253145Comparing Values of Multiple Keys in a Python Dictionary

   devcodef1.com › news › 1253145

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   2 days ago · The .items() method returns a list of tuples, where each tuple contains a key and its corresponding value. We can then use the key and value variables to access the key-value pairs in the dictionary. Comparing Values in a Python Dictionary. Once we have iterated through the dictionary, we can compare the values using any comparison operator we ...

3. stackoverflow.com › questions › 78466610How to compare values of a key in a Python dictionary with ...

   stackoverflow.com › questions › 78466610

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   1 day ago · Your desired output is not very clear. You can't have the same key multiple times in a dictionary. If you want multiple values for the same key, you probably need to make the value a list (which can then contain the multiple real values). –

4. discuss.itversity.com › t › exploring-dictionaryExploring Dictionary Manipulation in Python - Postgres ...

   discuss.itversity.com › t › exploring-dictionary

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   4 days ago · The update method allows us to merge one dictionary with another. We can pass a list of key-value pairs or another dictionary to merge into the existing dictionary. d.update({'first_name': 'Donald', 'last_name': 'Duck'}) Removing Elements. Elements from the dictionary can be removed using the pop and popitem methods.

5. www.dhiwise.com › post › navigating-key-value-pairsMastering Key-Value Pairs in Swift Dictionary

   www.dhiwise.com › post › navigating-key-value-pairs

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   4 days ago · Swift dictionaries are a collection of key value pairs where each key is associated with a value. A key can be of any type that conforms to the Hashable protocol, meaning it must provide a unique identifier, or hash value, for each key in the dictionary. The value can be of any type, making dictionaries a flexible way to store information.

6. linhkid.substack.com › p › dictionary-of-basic-andDictionary of basic & popular terms in AI/ML/NLP/Data Science ...

   linhkid.substack.com › p › dictionary-of-basic-and

   1 day ago · Dictionary of basic & popular terms in AI/ML/NLP/Data Science - Part 1: A-F Part 1: A to F. This is actually more like a references for me, so my own understanding can be a bit different and non-standard. It will be sorted by Alphabetical order. Feel free to add some more!

7. dnmtechs.com › java-hashmap-a-comparableJava HashMap: A Comparable Alternative to Python Dictionaries

   dnmtechs.com › java-hashmap-a-comparable

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   3 days ago · When it comes to working with key-value pairs in programming, dictionaries play a vital role in many languages. In Python, dictionaries are widely used and offer a convenient way to store and retrieve data based on unique keys. However, if you are a Java developer, you may wonder if there is an equivalent data structure […]

8. www.30secondsofcode.org › python › sFind the key of the min or max value in a Python dictionary

   www.30secondsofcode.org › python › s

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   5 days ago · Find the key of the min or max value in a Python dictionary. Python's min() and max() functions can be used to find the minimum and maximum values in a dictionary. However, if you want to find the key of the minimum or maximum value, you can use the key parameter of these functions. Key of the minimum value in a dictionary