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1. Top results related to what is a dictionary function in python?

   • What is the benefit to define a function in a function in python?

     Top Answer

     Answered Jul 22, 2011 · 72 votes

     Why defining a function within a function?

     To keep it isolated. It's only used in this one place. Why define it more globally when it's used locally?

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     1/5

   • What is a def __call__(self,in_data) function used for in python and where is the in_data getting its value

     Top Answer

     Answered Jul 17, 2019 · 0 votes

     __call__

     is called when you try to invoke the object as though it were a function. You can see that being done at the bottom. p

     is a Perceptron object, but it's being treated as a function when you write

     y = p(np.array(x))-

     So where is the data coming from? It's the np.array(x)

     that's being passed in.

     You can read more about the "dunder"/"magic" methods here.

     I'd actually argue that this is an abuse of __call__

     though. I wouldn't consider a Perceptron to be inherently function-like. I think using a normal method would be clearer:

     class Perceptron: . . . def give_input(self, in_data): # Instead of __call__ weighted_input = self.weights*in_data weighted_sum = weighted_input.sum() return Perceptron.unit_step_function(weighted_sum)for x in [np.array([0,0]),np.array([0,1]),np.array([1,0]),np.array([1,1])]: y = p.give_input(np.array(x)) # Just a typical method call now

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     2/5

   • What is a good alternative to use assignment in map function in python?

     Top Answer

     Answered May 30, 2013 · 5 votes

     Use this, it's preferred:

     for i in somelist: test[i] += value[i]-

     And anyway, your example is not a good case for using map. You use map or even better, list comprehensions, when you want to create a new list as a result. In this case an assignment is being performed over each item, so there's no point in creating a new list here!

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     3/5

   • What is the [x] in a "Function()[x]" in Python?

     Top Answer

     Answered Aug 23, 2019 · 3 votes

     [] is the indexing operator in Python.

     If you have a list or tuple l, l[n] means the nth element of it.

     If you have a dictionary d, d[x] means the element whose key is x.

     If you have a string s, s[n]means then`th character in the string.

     Some other datatypes define their own indexing functions, but they generally implement the same idea, possibly extending it (Numpy arrays allow you to use a tuple to perform multi-dimensional indexing and slicing).

     If you put [x] after a function call, it performs the indexing on whatever the function returns.

     y = function()[x]-

     is equivalent to

     temp = function()y = temp[x]

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     4/5

   • What is the benefit of using assigning a default value to a parameter in a function in python

     Top Answer

     Answered Sep 10, 2018 · 0 votes

     It's because when doing:

     def calc_tax(sales_total,tax_rate=0.04): print(sales_total * tax_rate)-

     You can do:

     calc_tax(100)

     Then here tax_rate is an argument that's assigned to a default value so can change it by:

     calc_tax(any thing here,any thing here)

     OR:

     calc_tax(any thing here,tax_rate=any thing here)

     So in the other-hand, this code:

     def calc_tax(sales_total): print(sales_total*0.04)

     Is is only able to do:

     calc_tax(any thing here)

     Because there is no second argument

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     5/5

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2. realpython.com › python-dictsDictionaries in Python – Real Python

   realpython.com › python-dicts

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   Python provides another composite data type called a dictionary, which is similar to a list in that it is a collection of objects. Here’s what you’ll learn in this tutorial: You’ll cover the basic characteristics of Python dictionaries and learn how to access and manage dictionary data.

   • Dictionaries in Python

     Python provides a composite data type called a dictionary,...

   • Take The Quiz

     Python Tutorials → In-depth articles and video courses...

3. www.w3schools.com › python › python_dictionariesPython Dictionaries - W3Schools

   www.w3schools.com › python › python_dictionaries

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   A dictionary is a collection which is ordered*, changeable and do not allow duplicates. As of Python version 3.7, dictionaries are ordered. In Python 3.6 and earlier, dictionaries are unordered. Dictionaries are written with curly brackets, and have keys and values: Example Get your own Python Server. Create and print a dictionary: thisdict = {

   Code sample

   thisdict ={

     "brand": "Ford",

     "model": "Mustang",

     "year": 1964

   }...

   See more on w3schools

4. People also ask

   What is a dictionary in Python?

   • Dictionaries are used to store data values in key:value pairs. A dictionary is a collection which is ordered*, changeable and do not allow duplicates. As of Python version 3.7, dictionaries are ordered. In Python 3.6 and earlier, dictionaries are unordered. Dictionaries are written with curly brackets, and have keys and values:

   Python Dictionaries - W3Schools

   www.w3schools.com/python/python_dictionaries.asp

   See all results for this question

   How do dictionaries work in Python?

   • In Python 3.6 and earlier, dictionaries are unordered. Dictionaries are written with curly brackets, and have keys and values: Create and print a dictionary: Dictionary items are ordered, changeable, and do not allow duplicates. Dictionary items are presented in key:value pairs, and can be referred to by using the key name.

   Python Dictionaries - W3Schools

   www.w3schools.com/python/python_dictionaries.asp

   See all results for this question

   Are dictionaries ordered in Python?

   • As of Python version 3.7, dictionaries are ordered. In Python 3.6 and earlier, dictionaries are unordered. Dictionaries are written with curly brackets, and have keys and values: Create and print a dictionary: Dictionary items are ordered, changeable, and do not allow duplicates.

   Python Dictionaries - W3Schools

   www.w3schools.com/python/python_dictionaries.asp

   See all results for this question

   What is a dictionary key in Python?

   • Almost any type of value can be used as a dictionary key in Python. You just saw this example, where integer, float, and Boolean objects are used as keys: You can even use built-in objects like types and functions: However, there are a couple restrictions that dictionary keys must abide by.

   Dictionaries in Python – Real Python

   realpython.com/python-dicts/

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5. www.geeksforgeeks.org › python-dictionaryDictionaries in Python - GeeksforGeeks

   www.geeksforgeeks.org › python-dictionary

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   Apr 9, 2024 · Python Dictionary Syntax. dict_var = {key1 : value1, key2 : value2, …..} What is a Dictionary in Python? Dictionaries in Python is a data structure, used to store values in key:value format. This makes it different from lists, tuples, and arrays as in a dictionary each key has an associated value.

6. python.land › python-data-types › dictionariesPython Dictionary: How To Create And Use, With Examples

   python.land › python-data-types › dictionaries

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   Jul 14, 2023 · Table of Contents [ hide] 1 Creating a Python Dictionary. 2 Access and delete a key-value pair. 3 Overwrite dictionary entries. 4 Using try… except. 5 Valid dictionary values. 6 Valid dictionary keys. 7 More ways to create a Python dictionary. 8 Check if a key exists in a Python dictionary. 9 Getting the length of a Python dictionary.

7. stackabuse.com › python-dictionary-tutorialGuide to Dictionaries in Python - Stack Abuse

   stackabuse.com › python-dictionary-tutorial

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   Aug 31, 2023 · A Python dictionary is one such data structure that can store data in the form of key-value pairs - conceptually similar to a map. The values in a Python dictionary can be accessed using the keys. In this guide, we will be discussing Python dictionaries in detail.

8. www.dataquest.io › blog › python-dictionariesPython Dictionaries: A Comprehensive Tutorial (with 52 Code ...

   www.dataquest.io › blog › python-dictionaries

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   Apr 1, 2022 · A Python dictionary is a data structure that allows us to easily write very efficient code. In many other languages, this data structure is called a hash table because its keys are hashable. We'll understand in a bit what this means. A Python dictionary is a collection of key:value pairs.

9. www.pythontutorial.net › python-dictionaryPython Dictionary - Python Tutorial

   www.pythontutorial.net › python-dictionary

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   empty_dict = {} print(type(empty_dict)) Code language: Python (python) Output: < class 'dict'> Code language: Python (python) The following example defines a dictionary with some key-value pairs: person = { 'first_name': 'John' , 'last_name': 'Doe' , 'age': 25 , 'favorite_colors': [ 'blue', 'green' ], 'active': True . }