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1. Top results related to list mean python

   • Python - Value list Mean

     Sometimes, while working with Python dictionary values, we can have problems in which we need to find mean of all the values of all dictionary value lists. This problem can have applications across many domains including web development. Let’s discuss certain ways in which this problem can be solved.

     Input : test_dict = {'best': [11, 21], 'Gfg': [7, 5]} Output : {'best': 16.0, 'Gfg': 6.0}

     Input : test_dict = {'Gfg' : [9]} Output : {'Gfg': 9.0}

     Method #1: Using loop + sum() + len()

     The combination of above functions can be used to solve this problem. In this, we compute the sum of all values using sum() and all value list lengths using len(). The iteration is done using loop. 

     Python3

     # Python3 code to demonstrate working of # Value list mean# Using loop + sum() + len() # initializing dictionarytest_dict = {'Gfg' : [6, 7, 5, 4], 'is' : [10, 11, 2, 1], 'best' : [12, 1, 2]}  # printing original dictionaryprint("The original dictionary is : " + str(test_dict)) # Value list mean# Using loop + sum() + len()res = dict()for key in test_dict:    res[key] = sum(test_dict[key]) / len(test_dict[key]) # printing result print The dictionary...

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     1/5

   • Python | Mean of tuple list

     Sometimes, while working with Python tuple list, we can have a problem in which we need to find the average of tuple values in the list. This problem has the possible application in many domains including mathematics. Let’s discuss certain ways in which this task can be performed. 

     Method #1: Using loops The first approach that can be thought of to solve this problem can be a brute force approach in which we just loop each tuple to add element and then just divide it by number of tuples in the list. 

     Python3

     # Python3 code to demonstrate working of # Mean of tuple list # Using loops  # Initializing list test_list = [(1, 4, 5), (7, 8), (2, 4, 10)]  # printing original list print("The original list is : " + str(test_list))  # Average of tuple list # Using loops sum = 0for sub in test_list:     for i in sub:         sum = sum + i res = sum / len(test_list)  # printing result print("The mean of tuple list is : " + str(res))

     Time complexity: O(n^2) where n is the total number of elements in the tuple list.  Auxiliary space: O(1) as we are only using...

     • Convert the list of tuples to a single list using extend() and list() methods.
     • Find the average and print the average using the sum() and len() methods.

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     2/5

   • Python | Harmonic Mean of List

     While working with Python, we can have a problem in which we need to find harmonic mean of a list cumulative. This problem is common in Data Science domain. Let’s discuss certain ways in which this problem can be solved. 

     Method #1 : Using loop + formula The simpler manner to approach this problem is to employ the formula for finding harmonic mean and perform using loop shorthands. This is the most basic approach to solve this problem. 

     Python3

     # Python3 code to demonstrate working of# Harmonic Mean of List# using loop + formula # initialize listtest_list = [6, 7, 3, 9, 10, 15] # printing original listprint("The original list is : " + str(test_list)) # Harmonic Mean of List# using loop + formulasum = 0for ele in test_list:    sum += 1 / ele    res = len(test_list)/sum # printing resultprint("The harmonic mean of list is : " + str(res))

     Output : 

     The original list is : [6, 7, 3, 9, 10, 15]The harmonic mean of list is : 6.517241379310345

     Time Complexity: O(n) where n is the number of elements in the string list. The loop + formula is used to perform...

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     3/5

   • Python: Mean Value function, raise exceptions when list is empty and argument not a list

     Top Answer

     Answered Nov 30, 2013 · 0 votes

     Python 3.3 work perfectly I don't understand what do you expect?? Both cases of exception prints the message and average works... Tried:

     mean_value(445)-

     got :

     TypeError: wrong argument -

     also with a empty list:

     ValueError: empty list-

     Check all answers on Stack Overflow

     4/5

   • Python | Column Mean in tuple list

     Sometimes, while working with records, we can have a problem in which we need to average all the columns of a container of lists which are tuples. This kind of application is common in web development domain. Let’s discuss certain ways in which this task can be performed.

     Method #1 : Using sum() + list comprehension + zip()  This task can be performed using combination of above functions. In this, we cumulate the like index elements, i.e columns using zip(), and then iterate through them using list comprehension and perform summation using sum(). We divide the each result with No of rows for average computation.

     Python3

     # Python3 code to demonstrate working of # Column Mean in tuple list # using list comprehension + sum() + zip()    # initialize list test_list = [(1, 2, 3), (6, 7, 6), (1, 6, 8)]    # printing original list print("The original list : " + str(test_list))    # Column Mean in tuple list # using list comprehension + sum() + zip() res = [sum(ele) / len(test_list) for ele in zip(*test_list)]    # printing result print("The Cumulative column mean is : " + str(res))

     Output

     The original list 1 2 3 6 7 6...

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     5/5

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2. stackoverflow.com › questions › 9039961python - Finding the average of a list - Stack Overflow

   stackoverflow.com › questions › 9039961

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   Dec 8, 2023 · This is because under the hood, mean() uses statistics._sum() which returns a data type to convert the mean into (and Decimal is not on Python's number hierarchy), while fmean() uses math.fsum() which just adds the numbers up (which is also much faster than built-in sum() function).

   Code sample

   LIST_RANGE = 10000000000

   NUMBERS_OF_TIMES_TO_TEST = 10000

   l = list(range(10))

   def mean1():

     return statistics.mean(l)...

   See more on stackoverflow

3. www.digitalocean.com › average-of-list-in-python5 Ways to Find The Average of a List in Python | DigitalOcean

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   • Python mean() function. Python 3 has statistics module which contains an in-built function to calculate the mean or average of numbers. The statistics.mean() function is used to calculate the mean/average of input values or data set.
   • Using Python sum() function. Python statistics.sum()function can also be used to find the average of data values in Python list. The statistics.len() function is used to calculate the length of the list i.e.
   • Using Python reduce() and lambda method. We can use Python reduce() function along with the lambda() function. Python reduce() function: The reduce() function is basically used to apply a particular(input) function to the set of elements passed to the function.
   • Python operator.add() function to find the average of a list. The Python operator module contains various functions to perform basic calculations and operations efficiently.

4. www.geeksforgeeks.org › find-average-list-pythonFind average of a list in python - GeeksforGeeks

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   • Average of A List Using Sum() and len() in Python
   • Average of A List Using reduce() and Lambda in Python
   • Average of A List Using Python Mean
   • Average of A List by Iterating List in Python

   In Python,we can find the average of a list by simply using the sum() and len() functions. 1. sum(): Using sum() function we can get the sum of the list. 2. len(): len() function is used to get the length or the number of elements in a list. Output: Time Complexity: O(n)where n is the length of the list. Auxiliary Space: O(1)as we only require a si...

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   We can use the reduce()to reduce the loop and by using the lambda functioncan compute the summation of the list. We use len() to calculate length as discussed above. Output: Time complexity:O(n), where n is the length of the list lst. Auxiliary space:O(1). The space used is constant and independent of the size of the input list.

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   The inbuilt function mean()can be used to calculate the mean( average ) of the list. Output: Time complexity:O(n), where n is the length of the list. Auxiliary space:O(1).

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   Iterating listsusing for loop and doing operations on each element of the list. Output: Time complexity: O(n) Auxiliary space: O(n), where n is the length of list.

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   • Video Duration: 3 min

5. stackoverflow.com › questions › 71981733Finding the mean of Python list - Stack Overflow

   stackoverflow.com › questions › 71981733

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   Apr 23, 2022 · statistics.mean() works on vanilla Python lists. It does not work on numpy.ndarrays. You should use numpy.mean() instead. Also, it looks like accuracy_list is a list containing a one-element numpy list. If that is the case, you can use list unpacking:

   • statistics.mean() works on vanilla Python lists. It does not work on numpy.ndarray s. You should use numpy.mean() instead. Also, it looks lik...
   • Try this: l = [15, 18, 2, 36, 12, 78, 5, 6, 9] import statistics statistics.mean(l) OR On older versions of Python you can do: sum(l) / len(l) O...
   • I'm not sure why there's a NumPy array in the list, so you could just extract it and compute the mean: accuracy_list[0].mean()

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   • In Python programming, a list is created by placing all the items (elements) inside square brackets [], separated by commas. It can have any number of items and they may be of different types (integer, float, string etc.).

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   What are some of the methods associated with a Python list?

   • Python List provides different methods to add items to a list. 1. Using append () The append () method adds an item at the end of the list. For example, numbers = [21, 34, 54, 12] print("Before Append:", numbers) # using append method numbers.append (32) print("After Append:", numbers)

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   What are the benefits of using a list in Python?

   • Sets are the iterable and mutable unordered collection of data types in Python. Python uses lists to store the sequential order of different kinds of data. Because Python lists are mutable types, we can change their elements after they’ve been generated.

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7. pythonguides.com › how-to-find-mean-of-a-list-pythonHow to Find Mean of a List Python

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   May 11, 2024 · The Mean of a List Python. First, to find the mean of a list in Python, I want to explain what means are and how to calculate them. Remember that means are also known as averages. The average is the sum of elements divided by the number of elements. For example, you have a list of numbers like this [3, 5, 7]. As you can see, this list contains ...

8. datagy.io › python-average-of-listPython: Find Average of List or List of Lists • datagy

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   Aug 31, 2021 · Python doesn’t have a built-in function to calculate an average of a list, but you can use the sum() and len() functions to calculate an average of a list. In order to do this, you first calculate the sum of a list and then divide it by the length of that list. Let’s see how we can accomplish this: # Returns 5.0.

9. www.freecodecamp.org › news › how-to-calculate-theHow to Calculate the Average of a List — Statistics and ...

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   Jul 9, 2020 · Finally, the mean is another way to refer to the average of the set. To find the mean, just add all the numbers together and divide it by the total number of elements in the set. In the case of the numbers above, if we add them all together, we get 28. The total number of items in the set is 7, so our mean is 4.