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1. Top results related to how to create a dictionary in python from two lists

   • how to create a dictionary using two lists in python?

     Top Answer

     Answered Mar 03, 2013 · 36 votes

     You can use zip function: dict(zip(x, y))

     >>> x = ['1', '2', '3', '4']... y = [[1,0],[2,0],[3,0],[4,]]>>> dict(zip(x, y))0: {'1': [1, 0], '2': [2, 0], '3': [3, 0], '4': [4]}-

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     1/5

   • How to create a Python dictionary from two columns in a SQL table query?

     Top Answer

     Answered May 25, 2020 · 0 votes

     You need to initialize an empty dict then add an entry to it for each row in your result set.

     cursor.execute('SELECT id, name FROM colors')test001 = {}for (id, name) in cursor: test001[id] = name

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     2/5

   • How to create a dictionary of lists from two columns in a dataframe

     Top Answer

     Answered May 23, 2017 · 3 votes

     look ad this: list to dictionary conversion with multiple values per key?

     from collections import defaultdictd = defaultdict(list)for i, j in zip(df.A,df.B): d[i].append(j)-

     if this ok?

     EDIT: If you want, you can convert it to simple dict:

     d = dict(d)-

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     3/5

   • How to create a dictionary from a list of lists in python?

     Top Answer

     Answered Nov 12, 2019 · 0 votes

     First get the list of first elements:

     filtered_list = [x[0] for x in initial_list]-

     And here are your unique elements:

     unique_elements = set([y for x in initial_list for y in x])

     Now initialize a dictionary with keys from unique elements and values of zero:

     counts = {e: 0 for e in unique_elements}

     Finally update the values of the dictionary with the frequencies of each element in the filtered list. Since you asked a solution without counter, here is a simple loop to achieve that:

     for i in filtered_list: counts[i] = counts.get(i, 0) + 1print(counts)# {'banana': 2, 'grapes': 1, 'oranges': 0}

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     4/5

   • How to create a 3 dimensional dictionary from 3 lists in Python

     Top Answer

     Answered Jun 16, 2017 · 1 votes

     Since you are using PuLP, you may want to look into pulp's makeDict().

     Suppose you have the following:

     i = ['a', 'b']j = ['1', '2', '3']l = ['01', '02']-

     and that for your demand values you have:

     value_a_1_01 = 10value_a_1_02 = 20value_a_2_01 = 30value_a_2_02 = 40value_a_3_01 = 50value_a_3_02 = 60value_b_1_01 = 70value_b_1_02 = 80value_b_2_01 = 90value_b_2_02 = 100value_b_3_01 = 110value_b_3_02 = 120

     You can then create an array that contains your demand data like this:

     array = [[{'01': 10, '02': 20}, {'01': 30, '02': 40}, {'01': 50, '02': 60}], [{'01': 70, '02': 80}, {'01': 90, '02': 100}, {'01': 110, '02': 120}]]

     and now define your dictionary:

     D = pulp.makeDict([i, j], array)-

     EDIT: Since the data set up was a bit messy before, setting up the array like this makes it much cleaner (and easier to edit):

     array = [ [[10, 20], [30, 40], [50, 60]], [[70, 80], [90, 100], [110, 120]] ]

     Now the parameters for makeDict() should be:

     D = pulp.makeDict([i, j, l], array)-

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     5/5

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2. www.geeksforgeeks.org › python-convert-two-listsPython | Convert two lists into a dictionary - GeeksforGeeks

   www.geeksforgeeks.org › python-convert-two-lists

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   Sep 1, 2023 · Convert two lists into a dictionary using dict () and zip () This method uses the built-in dict () function to create a dictionary from two lists using the zip () function. The zip () function pairs the elements in the two lists together, and dict () converts the resulting tuples to key-value pairs in a dictionary.

3. stackoverflow.com › questions › 7271385How do I combine two lists into a dictionary in Python?

   stackoverflow.com › questions › 7271385

   • Cached

   Apr 4, 2013 · Sep 1, 2011 at 15:33. 6 Answers. Sorted by: 212. dict(zip([1,2,3,4], [a,b,c,d])) If the lists are big you should use itertools.izip. If you have more keys than values, and you want to fill in values for the extra keys, you can use itertools.izip_longest.

   Usage example

   dict(zip([1,2,3,4], [a,b,c,d]))

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4. datagy.io › python-create-dictionary-from-two-listsPython: Create Dictionary From Two Lists • datagy

   datagy.io › python-create-dictionary-from-two-lists

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   • Covert Two Lists Into A Dictionary with Python Zip
   • Covert Two Lists Into A Dictionary with A Dictionary Comprehension
   • Covert Two Lists Into A Dictionary with A For Loop
   • What Is The Most Efficient Way to Covert Two Lists Into A dictionary?
   • Conclusion

   The Python zip() function is an incredibly helpful function to make iterating or multiple iterators much easier. To learn about the zip() function a bit more, check out my in-depth tutorial on zipping multiple Python lists. Let’s see how we can use the zip()function to convert two Python lists into a dictionary: Let’s see what we’ve done here: 1. W...

   See full list on datagy.io

   Dictionary comprehensions are a fun way to loop over items and create a resulting dictionary. To learn more about dictionary comprehensions, check out my in-depth tutorial here. Let’s work with the two lists that we worked with above and use a Python dictionary comprehension to create a dictionary: The way that this dictionary comprehension works i...

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   Wherever you can use a comprehension, you can also use a for-loop. Let’s see how we can loop over two lists to create a Python dictionary out of the two lists. We will want to loop over the range()of the length of one of the lists and access the items. Let’s give this a try and see how we can build on it: Let’s explore what we’ve done here: 1. We c...

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   Now that you have learned three different methods to turn two Python lists into a dictionary, let’s see which of these methods has the highest performance. We can create a decorator to time these itemsand quickly turn them into functions: From this, we can see that the zip()function method is significantly faster. It also happens to be more memory ...

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   In this post, you learned three different ways two turn two Python lists into a dictionary. You learned how to accomplish this using the built-in zip() function, a dictionary comprehension, and a for loop. You also learned that the zip()function is the most efficient way of doing this, saving you nearly 3/4 of the time. To learn more about the Pyth...

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5. blog.finxter.com › 5-best-ways-to-convert-two5 Best Ways to Convert Two Lists into a Dictionary in Python

   blog.finxter.com › 5-best-ways-to-convert-two

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   Mar 11, 2024 · Method 1: Using the zip () Function. The zip() function in Python makes it straightforward to iterate over two lists in parallel. This can be used in a dictionary comprehension to create a dictionary where elements from the first list become keys and elements from the second list become values. Here’s an example:

6. thispointer.com › how-to-create-a-dictionary-fromHow to Create a Dictionary from two Lists in Python ...

   thispointer.com › how-to-create-a-dictionary-from

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   Apr 30, 2023 · This tutorial will discuss about unique ways to create a dictionary from two lists in Python. Table Of Contents. Using zip () method. Using map () and zip () methods. Summary. Using zip () method. Us ethe zip () method in Python, to zip the two lists together into a zipped object. It will return a list of tuples.

7. statisticsglobe.com › create-dictionary-from-twoCreate Dictionary from Two Lists in Python (2 Examples)

   statisticsglobe.com › create-dictionary-from-two

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   Create Dictionary from Two Lists in Python (2 Examples) This post demonstrates how to convert two lists into a dictionary in the Python programming language. The post is structured as follows: 1) Creation of Example Data. 2) Example 1: Build Dictionary from Two Lists in Same Length.

8. People also ask

   How to create a dictionary from two lists in Python?

   • This tutorial will discuss about unique ways to create a dictionary from two lists in Python. Table Of Contents Us ethe zip () method in Python, to zip the two lists together into a zipped object. It will return a list of tuples. Each tuple will have 2 items, one from first list, and second from another list.

   How to Create a Dictionary from two Lists in Python?

   thispointer.com/how-to-create-a-dictionary-from-two-lists-in-python/

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   How to convert two lists into a dictionary?

   • Convert two lists into a dictionary using dict () and zip () This method uses the built-in dict () function to create a dictionary from two lists using the zip () function. The zip () function pairs the elements in the two lists together, and dict () converts the resulting tuples to key-value pairs in a dictionary. Example:

   Python | Convert two lists into a dictionary - GeeksforGeeks

   www.geeksforgeeks.org/python-convert-two-lists-into-a-dictionary/

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   How to create dictionary from two lists using Python enumerate?

   • Create Dictionary From Two Lists using enumerate () In this example, the Python enumerate () function is used to loop over the elements in the zip (test_keys, test_values) object, which pairs the elements in the two lists together.

   Python | Convert two lists into a dictionary - GeeksforGeeks

   www.geeksforgeeks.org/python-convert-two-lists-into-a-dictionary/

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   What is the difference between a Python list and a dictionary?

   • A Python list is an ordered sequence of objects, whereas dictionaries are unordered. The items in the list can be accessed by an index (based on their position) whereas items in the dictionary can be accessed by keys and not by their position. Let’s see how to convert a Python list to a dictionary. Converting a list of tuples to a dictionary.

   10 Ways to Convert Lists to Dictionaries in Python

   builtin.com/software-engineering-perspectives/convert-list-to-dictionary-python

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9. builtin.com › convert-list-to-dictionary-python10 Ways to Convert Lists to Dictionaries in Python

   builtin.com › convert-list-to-dictionary-python

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   Jan 13, 2023 · Let’s see how to convert a Python list to a dictionary. 10 different ways to Convert a Python List to a Dictionary. Converting a list of tuples to a dictionary. Converting two lists of the same length to a dictionary. Converting two lists of different length to a dictionary. Converting a list of alternative key, value items to a dictionary.