Program to Search the Number of Times a Particular Number Occurs in a List

Python Program to Search the Number of Times a Particular Number Occurs in a List

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Lists in Python:

The Python list is a straightforward ordered list of items. Python lists are extremely powerful since the objects in them do not have to be homogeneous or even of the same type. Strings, numbers, and characters, as well as other lists, can all be found in a Python list. Python lists are also mutable: once stated, they can be easily altered via a variety of list methods. Let’s look at how to use these techniques to handle Python lists.

Given a list and a element, the task is to write a  Python Program to Determine the Number of Occurrences of a Specific Number in a given List

Examples:

Examples1:

Input:

given list = ["my", "name", "is", "BTechGeeks", "coding", "platform", "for", "BTechGeeks"]

Output:

The count of the element ' BTechGeeks ' in the list ['my', 'name', 'is', 'BTechGeeks', 'coding', 'platform', 'for', 'BTechGeeks'] = 2

Examples2:

Input:

given list = [5, 9, 1, 3, 6, 9, 2, 12, 8]

Output:

The count of the element ' 9 ' in the list [5, 9, 1, 3, 6, 9, 2, 12, 8] = 2

Python Program to Search the Number of Times a Particular Number Occurs in a List

There are several ways to determine the Number of Occurrences of a Specific Number in a given List some of them are:

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Method #1: Using a Counter Variable

Approach:

  • Scan the given list or give list input as static.
  • Scan the given element or give given element as static.
  • Take a variable which stores the count of the element say countEleme and initialize it to 0.
  • Traverse the given list using for loop.
  • If the iterator element is equal to the given element.
  • Then increment the countEleme value by 1.
  • Print the countEleme.

Below is the implementation:

# given list
given_list = ["my", "name", "is", "BTechGeeks",
              "coding", "platform", "for", "BTechGeeks"]
# given element
given_element = "BTechGeeks"
# Take a variable which stores the count of the element
# say totalCount and initialize it to 0.
countEleme = 0
# Traverse the given list using for loop.
for value in given_list:
    # if the value is equal too given_element then increase the countEleme by 1
    if(value == given_element):
        countEleme = countEleme+1
# Print the countEleme
print("The count of the element '", given_element,
      "' in the list", given_list, "=", countEleme)

Output:

The count of the element ' BTechGeeks ' in the list ['my', 'name', 'is', 'BTechGeeks', 'coding', 'platform', 'for', 'BTechGeeks'] = 2

Method #2: Using Count() function

Approach:

  • Scan the given list or give list input as static.
  • Scan the given element or give given element as static.
  • Count the given element in the list using count() function.
  • Print the countEleme.

Below is the implementation:

# given list
given_list = ["my", "name", "is", "BTechGeeks",
              "coding", "platform", "for", "BTechGeeks"]
# given element
given_element = "BTechGeeks"
# Count the given element in the list using count() function.
countEleme = given_list.count(given_element)
# Print the countEleme
print("The count of the element '", given_element,
      "' in the list", given_list, "=", countEleme)

Output:

The count of the element ' BTechGeeks ' in the list ['my', 'name', 'is', 'BTechGeeks', 'coding', 'platform', 'for', 'BTechGeeks'] = 2

Method #3: Using Counter() function

Approach:

  • Scan the given list or give list input as static.
  • Scan the given element or give given element as static.
  • Use Counter function which stores the frequency as values and element as keys in its dictionary
  • Print the value of the given element

Below is the implementation:

# importing counter function from collections
from collections import Counter
# given list
given_list = ["my", "name", "is", "BTechGeeks",
              "coding", "platform", "for", "BTechGeeks"]
# given element
given_element = "BTechGeeks"
# Using counter function
freqValues = Counter(given_list)
# Count the given element in the list
countEleme = freqValues[given_element]
# Print the countEleme
print("The count of the element '", given_element,
      "' in the list", given_list, "=", countEleme)

Output:

The count of the element ' BTechGeeks ' in the list ['my', 'name', 'is', 'BTechGeeks', 'coding', 'platform', 'for', 'BTechGeeks'] = 2

Method #4:Using List Comprehension

Approach:

  • Scan the given list or give list input as static.
  • Scan the given element or give given element as static.
  • Using list Comprehension checking if given element is equal to the iterator value
  • The count of the length of this new list gives the required answer

Below is the implementation:

# given list
given_list = ["my", "name", "is", "BTechGeeks",
              "coding", "platform", "for", "BTechGeeks"]
# given element
given_element = "BTechGeeks"
# Using list comprehension
elementlist = [eleme for eleme in given_list if eleme == given_element]

# Count the given element in the list using len function
countEleme = len(elementlist)
# Print the countEleme
print("The count of the element '", given_element,
      "' in the list", given_list, "=", countEleme)

Output:

The count of the element ' BTechGeeks ' in the list ['my', 'name', 'is', 'BTechGeeks', 'coding', 'platform', 'for', 'BTechGeeks'] = 2