python loop through array of dictionaries - Brave Search

How to iterate through a list of dictionaries

stackoverflow.com › questions › 35864007 › how-to-iterate-through-a-list-of-dictionaries

You could just iterate over the indices of the range of the len of your list:

dataList = [{'a': 1}, {'b': 3}, {'c': 5}]
for index in range(len(dataList)):
    for key in dataList[index]:
        print(dataList[index][key])

or you could use a while loop with an index counter:

dataList = [{'a': 1}, {'b': 3}, {'c': 5}]
index = 0
while index < len(dataList):
    for key in dataList[index]:
        print(dataList[index][key])
    index += 1

you could even just iterate over the elements in the list directly:

dataList = [{'a': 1}, {'b': 3}, {'c': 5}]
for dic in dataList:
    for key in dic:
        print(dic[key])

It could be even without any lookups by just iterating over the values of the dictionaries:

dataList = [{'a': 1}, {'b': 3}, {'c': 5}]
for dic in dataList:
    for val in dic.values():
        print(val)

Or wrap the iterations inside a list-comprehension or a generator and unpack them later:

dataList = [{'a': 1}, {'b': 3}, {'c': 5}]
print(*[val for dic in dataList for val in dic.values()], sep='\n')

the possibilities are endless. It's a matter of choice what you prefer.

Answer from MSeifert on Stack Overflow

w3schools.com › python › python_dictionaries_loop.asp

Python - Loop Dictionaries

You can loop through a dictionary by using a for loop. When looping through a dictionary, the return value are the keys of the dictionary, but there are methods to return the values as well.

realpython.com › iterate-through-dictionary-python

How to Iterate Through a Dictionary in Python – Real Python

November 23, 2024 - If you use this approach along with the [key] operator, then you can access the values of your dictionary while you loop through the keys: ... In this example, you use key and likes[key] at the same time to access your target dictionary’s keys and the values, respectively. This technique enables you to perform different operations on both the keys and the values of likes. Even though iterating through a dictionary directly is pretty straightforward in Python, you’ll often find that dictionaries provide more convenient and explicit tools to achieve the same result.

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stackoverflow.com › questions › 35864007 › how-to-iterate-through-a-list-of-dictionaries

python - How to iterate through a list of dictionaries - Stack Overflow

You could just iterate over the indices of the range of the len of your list:

dataList = [{'a': 1}, {'b': 3}, {'c': 5}]
for index in range(len(dataList)):
    for key in dataList[index]:
        print(dataList[index][key])

or you could use a while loop with an index counter:

dataList = [{'a': 1}, {'b': 3}, {'c': 5}]
index = 0
while index < len(dataList):
    for key in dataList[index]:
        print(dataList[index][key])
    index += 1

you could even just iterate over the elements in the list directly:

dataList = [{'a': 1}, {'b': 3}, {'c': 5}]
for dic in dataList:
    for key in dic:
        print(dic[key])

It could be even without any lookups by just iterating over the values of the dictionaries:

dataList = [{'a': 1}, {'b': 3}, {'c': 5}]
for dic in dataList:
    for val in dic.values():
        print(val)

Or wrap the iterations inside a list-comprehension or a generator and unpack them later:

dataList = [{'a': 1}, {'b': 3}, {'c': 5}]
print(*[val for dic in dataList for val in dic.values()], sep='\n')

the possibilities are endless. It's a matter of choice what you prefer.

use=[{'id': 29207858, 'isbn': '1632168146', 'isbn13': '9781632168146', 'ratings_count': 0}]
for dic in use:
    for val,cal in dic.items():
        print(f'{val} is {cal}')

discuss.python.org › python help

Loops, arrays, dictionaries -- oh my - Python Help - Discussions on Python.org

October 12, 2022 - Is there a way to carry out this set of instructions using a list or dictionary? Or what would your approach be to make the code more efficient? Thx!

w3schools.com › python › gloss_python_loop_dictionary_items.asp

Python Loop Through a Dictionary

When looping through a dictionary, the return value are the keys of the dictionary, but there are methods to return the values as well. Print all key names in the dictionary, one by one: ... Python Dictionaries Tutorial Dictionary Access Dictionary Items Change Dictionary Item Check if Dictionary Item Exists Dictionary Length Add Dictionary Item Remove Dictionary Items Copy Dictionary Nested Dictionaries

geeksforgeeks.org › python › iterate-over-a-dictionary-in-python

Iterate over a dictionary in Python - GeeksforGeeks

July 11, 2025 - ... statesAndCapitals = { 'Gujarat': ... print(key) ... Using `zip()` in Python, you can access the keys of a dictionary by iterating over a tuple of the dictionary's keys and values simultaneously....

tutorialspoint.com › iterate-through-list-of-dictionaries-in-python

Iterate Through List of Dictionaries in Python

Iterate through the list of dictionaries using for loop. Now we use the items() method to access the key?value pairs in each dictionary. Print the Key, Value pairs. list_of_dict = [ {"course": "DBMS", "price": 1500}, {"course": "Python", "price": ...

geeksforgeeks.org › iterate-through-list-of-dictionaries-in-python

Iterate through list of dictionaries in Python - GeeksforGeeks

November 22, 2021 - To Loop through values in a dictionary you can use built-in methods like values(), items() or even directly iterate over the dictionary to access values with keys.How to Loop Through a Dictionary in PythonThere are multipl

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tutorialspoint.com › home › python › python loop through dictionaries

Python Loop Through Dictionaries

February 21, 2009 - This view object provides a dynamic ... values. We can loop through dictionaries using the dict.items() method by iterating over the key-value pairs returned by this method....

stackoverflow.com › questions › 69637267

python - How to loop in array of dictionaries in a list - Stack ...

When you iterate over a list, you get the elements, not the indices. Consider

for car in cars:
  for x, y in car["coded"].items():
    print(x, y)

i in this iteration is going to be

{
   "name": "Ford",
   "type": "SHORT",
   "coded": {
     "1": "Escape",
     "2": "Fiesta",
     "999": "Gumbo"
   }
}

and

{
  "name": "Honda",
  "type": "SHORT",
  "coded": {
    "1": "Civic",
    "2": "CRV",
    "VCR": "Accord"
  }
}

and not 1 and 2 as you expected anyways a better way of doing this is going to be

cars= [ 
  {
    "name": "Ford",
    "type": "SHORT",
    "coded": {
      "1": "Escape",
      "2": "Fiesta",
      "999": "Gumbo"
    }
  },
  {
    "name": "Honda",
    "type": "SHORT",
    "coded": {
      "1": "Civic",
      "2": "CRV",
      "VCR": "Accord"
     }
   }
]

for i in cars:
  for x, y in i['coded'].items():
    print(x, y)

freecodecamp.org › news › python-iterate-over-dictionary-how-to-loop-through-a-dict

Python Iterate Over Dictionary – How to Loop Through a Dict

March 10, 2023 - The keys() method is compatible with both Python 2 and 3, so it is a good option if you need to write code that works on both versions of Python. In general, using a basic for loop to iterate through the keys of a dictionary is the fastest method of looping through a dictionary in Python.

codereview.stackexchange.com › questions › 84419 › loop-an-array-of-dictionary-with-keys-containg-sets-comparing-each-key-value

python - Loop an array of dictionary with keys containg sets; comparing each {key, value} pair; and combining dictionaries - Code Review Stack Exchange

While operator.itemgetter is a more efficient alternative to an equivalent lambda function, it does not beat normal dictionary lookup [], and using it for that purpose makes code harder to read.

Your code looks very complicated to me and I find it hard to follow, but the most likely bottleneck is the five-fold nested for loop.

In there, my first thought would be to consider if these lines...

            for pred in getter(val):
                for items in getter_2(val_2):
                    if(items == pred):

...or, if we eliminate the getter...

            for pred in val["predecessor"]:
                for items in val_2["setid_hash"]:
                    if(items == pred):

...could be replaced by a set operation such as:

            if not val["predecessor"].isdisjoint(val_2["setid_hash"]):

stackoverflow.com › questions › 9152431 › iterating-over-list-of-dictionaries

python - Iterating over list of dictionaries - Stack Overflow

You could use a generator to only grab ages.

# Get a dictionary 
myList = [{'age':x} for x in range(1,10)]

# Enumerate ages
for i, age in enumerate(d['age'] for d in myList): 
    print i,age

And, yeah, don't use semicolons.

Very simple way, list of dictionary iterate

>>> my_list
[{'age': 0, 'name': 'A'}, {'age': 1, 'name': 'B'}, {'age': 2, 'name': 'C'}, {'age': 3, 'name': 'D'}, {'age': 4, 'name': 'E'}, {'age': 5, 'name': 'F'}]

>>> ages = [li['age'] for li in my_list]

>>> ages
[0, 1, 2, 3, 4, 5]

reddit.com › r/python › iterate through list of dictionaries and get key and value.

r/Python on Reddit: Iterate through list of dictionaries and get key and value.

May 26, 2016 -

Hello everyone!

I have been unable to get the values out of a list of dictionaries with python. I've tried many things but nothing that is actually useful.

I have:

my_list = [
    { name: 'alex',
       last_name: 'leda'
     }
    { name: 'john',
       last_name: 'parsons'
     }
]

I want to be able to loop through all dictionaries of the list and extract both the key and its corresponding value. Any idea as to how I would be able to accomplish this?

Many thanks!

Try r/learnpython for learning the language. This sub is more focused on news according to the sidebar.

my_list = [
    {'name': 'alex', 'last_name': 'leda'},
    {'name': 'john', 'last_name': 'parsons'}
]

for person in my_list:
    for k, v in person.items():
        print('{}: {}'.format(k, v))

financetrain.com › loop-python-dictionaries-numpy-arrays

How to loop over python dictionaries and Numpy arrays

June 4, 2022 - In the previous lessons, we learned about how to loop over lists. In this lesson, we will learn about how to loop over python dictionaries and Numpy arrays.

pythoncentral.io › how-to-iterate-through-a-dictionary-in-python

How to Iterate Through a Dictionary in Python | Python Central

November 19, 2024 - Pandas provides several methods to iterate through a dictionary's keys, values, and key-value pairs (items): ... The items() method is the most commonly used approach, as it allows you to access both the keys and values in a single loop.

note.nkmk.me › home › python

Iterate Over Dictionary Keys, Values, and Items in Python | note.nkmk.me

April 24, 2025 - Built-in Types - dict.items() — Python 3.13.3 documentation · for k, v in d.items(): print(k, v) # key1 1 # key2 2 # key3 3 ... You can also receive the key-value pairs as (key, value) tuples in the loop.

reddit.com › r/learnpython › how can i loop through a list and basically make a dictionary/hashtable with the list items as keys?

r/learnpython on Reddit: How can I loop through a list and basically make a dictionary/hashtable with the list items as keys?

December 24, 2022 -

How can I loop through a list and basically make a dictionary/hashtable with the list items as keys? I was looking at a leetcode solution for finding out which number in a list is a single number. Here's the code :

from collections import defaultdict
class Solution:
    def singleNumber(self, nums: List[int]) -> int:
        hash_table = defaultdict(int)
        for i in nums:
            hash_table[i] += 1
        
        for i in hash_table:
            if hash_table[i] == 1:
                return i

I was wondering if there was an easier way of doing this without using collections and defaultdict

d = {key: "some value" for key in your_list}

keys = ['a', 'b', 'c', 'd'] hash_table = dict.fromkeys(keys, 'default value') print(hash_table) #{'a': 'default value', 'b': 'default value', 'c': 'default value', 'd': 'default value'}

careerkarma.com › blog › python › iterate through dictionary python: step-by-step guide

Iterate Through Dictionary Python: Step-By-Step Guide | Career Karma

December 1, 2023 - The for loop prints out both the ... key-value pair in a dictionary into a tuple. Using a for loop and the items() method you can iterate over all of the keys and values in a list....

replit.com › home › discover › how to loop through a dictionary in python

How to loop through a dictionary in Python | Replit

This is done using a list comprehension that iterates over the dictionary's items(). Then, you loop through this new, separate list and use del to remove each key from the original dictionary.