How to print a dictionary as key and count (if values is list) without for loop?

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Suppose I have a dictionary as follows

dic = {0: [1,2,3,4,5], 1:[7,4,6]}

While printing the dictionary as key and count, first updating the dictionary

for k, v in dic.items():
   dic[k] = len(v)

print(dic)

>>> {0:5, 1:3}

Is there a better way to do the above without for loop?

What do you mean saying without iteration? If you don't want to use a for loop, you can use a map function:

d = dict(map(lambda kv: (kv[0], len(kv[1])), d.items()))

Counting the frequencies in a list using dictionary in Python , Given an unsorted list of some elements(may or may not be integers), Find the frequency of each of the list as a key of the dictionary and store the corresponding count of that key as values. This makes the program much more compact without affecting the run time. print (CountFrequency(my_list))� For printing the keys and values, we can either iterate through the dictionary one by one and print all key-value pairs or we can print all keys or values at one go. For this tutorial, we are using python 3. Print all key-value pairs using a loop : This is the simplest way to print all key-value pairs of a dictionary. Using one for loop, we

If by no iteration you simply mean to do it without a for loop, you can map the dict values to the len function, zip them with the dict keys and pass the zipped key-value pairs to the dict constructor:

>>> d = {0: [1,2,3,4,5], 1:[7,4,6]}
>>> dict(zip(d, map(len, d.values())))
{0: 5, 1: 3}
>>>

Python, Initialize value. K = 2. # Using loop. # Selective key values in dictionary. res = 0. for key in test_dict: if test_dict[key] = = K: res = res + 1. # printing� To solve this, create a blank list before the for loop (values_list = []), then append keys to this list (values_list.append(k)), in the if loop. Last, move the return statement (return values_list) outside the for loop. – Victoria Stuart Jul 16 '19 at 21:31

First of all do not name a list 'list' or a dictionary 'dict', as this is a reserved word in python for the class that holds that data type.

You can do it neatly using dictionary comprehension as follows:

d = {0: [1,2,3,4,5], 1:[7,4,6]}
d = {i:len(j) for i,j in d.items()}
print(d)

Python: 4 ways to print items of a dictionary line by line – thispointer , Although it printed the contents of the dictionary, all the key-value pairs printed in a single line. Print a dictionary line by line using for loop & dict.items() In a single line using list comprehension & dict.items(), we can print the We passed the dictionary object and count of indent spaces in json.dumps(). Loop Through Dictionary Elements and Print Keys. If you want to use only the keys of the dictionary variable in our programming. You have to use the below code to get keys of dictionary variable in the output. It uses the for loop to iterate or loop through dictionary elements in Python.

Or use:

print({k:len(dic[k]) for k in dic})

Output:

{0: 5, 1: 3}

20. Dictionaries — How to Think Like a Computer Scientist: Learning , We can print the current value of the dictionary in the usual way: Another way to create a dictionary is to provide a list of key:value pairs using the the keys in a dictionary that we can omit the keys method call in the for loop If it's there, the function can return immediately without making any more Counting letters�. By using for in dictionary, it loops through all the keys in dictionary and for each key select the value and prints it. ''' Iterate over the dictionary using for loop ''' for key in wordFrequency: value = wordFrequency[key] print(key, " :: ", value)

9. Dictionaries � Python for person in everybody, In a list, the index positions have to be integers; in a dictionary, the indices can be The function dict creates a new dictionary with no items. If we print the dictionary again, we see a key-value pair with a colon between the key and value : The use of the get method to simplify this counting loop ends up being a very � You just have to use dict.values(). This will return a list containing all the values of your dictionary, without having to specify any key. You may also be interested in:.keys(): return a list containing the keys.items(): return a list of tuples (key, value) Note that in Python 3, returned value is not actually proper list but view object.

Using dictionaries to store data as key-value pairs, The dictionary stores objects as key-value pairs and can be used to represent complex The Python list stores a collection of objects in an ordered sequence. And that dictionary itself contains another dictionary via the key, "counts" . If we pass a dict object into a for-loop, by default, only the key will be yielded: I am just having trouble making the for loop. list = [102, 232, 424] count = 0 d = {} #Empty dictionary to add values into for i in list: #dictionary key = count #key.append(i) count+=1 So in the for loop I essentially want to make the count variable the key, and have the corresponding item in the list as the value. Then I would add one to

Python Dictionary(Dict): Update, Cmp, Len, Sort, Copy, Items, str , When you run this code, it should print the dictionary list without Charlie. The items() method returns a list of tuple pairs (Keys, Value) in the dictionary. For that, we use the for loop method with else if method. Python List Comprehension � Find AVERAGE List � Python List count() � Remove Duplicates List � Remove� Loop Through a Dictionary. 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.