Python program to get percentage of word frequency

In this article, we will learn how to get word frequency as a percentage in Python.

Suppose we have obtained a string input list. Now, we will find the percentage of each word in the given list of input strings.

formula

(Occurrence of X word / Total words) * 100

usage instructions

• Use sum(), Counter(), join() and split() functions

• Use join(), split() and count() functions

• Use the countOf() function of the operator module.

Method 1: Use sum(), Counter(), join() and split() functions

join() is a string function in Python that is used to join sequence elements separated by string delimiters to form a string.

Counter() The function is a subclass that counts the number of hashable objects. It implicitly creates a hash table of iterable objects when called/invoked.

Algorithm (steps)

The following are the algorithms/steps to perform the required task:

• Use the import keyword to import the Counter function from the collection module.

• Create a variable to store the input list string and print the list.

• Use the join() function to join all string elements of the input list.

• Use the split() function (split the string into a list. The delimiter can be defined; the default delimiter is any whitespace character) to split the concatenated string into a list of words, and use Counter() Function gets word frequency as key-value pair

• Use values() function to get all values ​​(frequency/count) from Counter and use sum() function to get their sum (returns the sum of all values) in the iterable project).

• Use the items() function to get the percentage of each word in the above counter words (returns a view object, i.e. it contains the key-value pairs of the dictionary, as tuples in a list).

• Print the percentage of each word in the input list.

The Chinese translation of

Example

is:

Example

The following program uses the sum(), Counter(), join() and split() functions to return the percentage of each word in a given list of input strings –

# importing a Counter function from the collections module
from collections import Counter

# input list of strings
inputList = ["hello tutorialspoint", "python codes", "tutorialspoint for python", "see python codes tutorialspoint"]
print("Input list:\n", inputList)

# Joining all the string elements of the list using the join() function
join_string = " ".join(i for i in inputList)

# splitting the joined string into a list of words and getting the

# frequency of words as key-value pairs using Counter() function

counter_words = Counter(join_string.split())
# getting all the values(frequencies/counts) from counter and

# finding the total sum of them
total_sum = sum(counter_words.values())

# getting the percentage of each word from the above counter words
res_percentage = {key: value / total_sum for key,
value in counter_words.items()}

# printing the percentage of each word from the input list
print("Percentage of each word from the input list:\n", res_percentage)

Output

When executed, the above program will generate the following output -

Input list:
['hello tutorialspoint', 'python codes', 'tutorialspoint for python', 'see python codes tutorialspoint']
Percentage of each word from the input list:
{'hello': 0.09090909090909091, 'tutorialspoint': 0.2727272727272727, 'python': 0.2727272727272727, 'codes': 0.18181818181818182, 'for': 0.09090909090909091, 'see': 0.09090909090909091}

Method 2: Use join(), split() and count() functions

Algorithm (steps)

The following are the algorithms/steps to perform the required task:

• Create an empty dictionary to store the result percentage/term frequency.

• Use for loop to traverse the word list.

• Use the if conditional statement to check whether the current element is not in the key of the dictionary, use the keys() function.

• If the above condition is true, use the count() function to get the count of the key (word).

• Divide it by the number of words to get the current word frequency and store it as a key in the new dictionary created above.

• Print the percentage of each word in the input list.

The Chinese translation of

Example

is:

Example

The following program uses the join(), split() and count() functions to return the percentage of each word in a given list of input strings –

# input list of strings
inputList = ["hello tutorialspoint", "python codes", "tutorialspoint for python", "see python codes tutorialspoint"]

# joining all the elements of the list using join()
join_string = " ".join(i for i in inputList)

# splitting the joined string into a list of words
listOfWords = join_string.split()

# Creating an empty dictionary for storing the resultant percentages
resDict = dict()

# traversing through the list of words
for item in listOfWords:
   
   # checking whether the current element is not in the keys of a dictionary
   if item not in resDict.keys():
      
      # getting the percentage of a current word if the condition is true
      resDict[item] = listOfWords.count(item)/len(listOfWords)

# printing the percentage of each word from the input list
print("Percentage of each word from the input list:\n", resDict)

Output

When executed, the above program will generate the following output -

Percentage of each word from the input list:
{'hello': 0.09090909090909091, 'tutorialspoint': 0.2727272727272727, 'python': 0.2727272727272727, 'codes': 0.18181818181818182, 'for': 0.09090909090909091, 'see': 0.09090909090909091}

Method 3: Use the countOf() function of the operator module

The Chinese translation of

Example

is:

Example

The following program uses the countOf() function to return the percentage of each word in a given list of input strings -

import operator as op
# input list of strings
inputList = ["hello tutorialspoint", "python codes", "tutorialspoint for python", "see python codes tutorialspoint"]

# joining all the elements of list using join()
join_string = " ".join(i for i in inputList)

# splitting the joined string into list of words
listOfWords = join_string.split()
resDict = dict()
for item in listOfWords:
   
   # checking whether the current element is not in the keys of dictionary
   if item not in resDict.keys():
      resDict[item] = op.countOf(listOfWords,   item)/len(listOfWords)
print("Percentage of each word from the input list:\n", resDict)

Output

When executed, the above program will generate the following output -

Percentage of each word from the input list:
{'hello': 0.09090909090909091, 'tutorialspoint': 0.2727272727272727, 'python': 0.2727272727272727, 'codes': 0.18181818181818182, 'for': 0.09090909090909091, 'see': 0.09090909090909091}

in conclusion

In this article, we learned three different Python methods to calculate percent word frequency. We also learned how to use the operator module's new function countOf() to get the frequency of a list element.

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