Python: Count the number of sublists contain a particular element
Python List: Exercise - 93 with Solution
Write a Python program to count the number of sublists contain a particular element.
Sample Solution:
Python Code:
def count_element_in_list(input_list, x):
ctr = 0
for i in range(len(input_list)):
if x in input_list[i]:
ctr+= 1
return ctr
list1 = [[1, 3], [5, 7], [1, 11], [1, 15, 7]]
print("Original list:")
print(list1)
print("\nCount 1 in the said list:")
print(count_element_in_list(list1, 1))
print("\nCount 7 in the said list:")
print(count_element_in_list(list1, 7))
list1 = [['A', 'B'], ['A', 'C'], ['A', 'D', 'E'], ['B', 'C', 'D']]
print("\nOriginal list:")
print(list1)
print("\nCount 'A' in the said list:")
print(count_element_in_list(list1, 'A'))
print("\nCount 'E' in the said list:")
print(count_element_in_list(list1, 'E'))
Sample Output:
Original list: [[1, 3], [5, 7], [1, 11], [1, 15, 7]] Count 1 in the said list: 3 Count 7 in the said list: 2 Original list: [['A', 'B'], ['A', 'C'], ['A', 'D', 'E'], ['B', 'C', 'D']] Count 'A' in the said list: 3 Count 'E' in the said list: 1
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Previous: Write a Python program to check if a nested list is a subset of another nested list.
Next: Write a Python program to count number of unique sublists within a given list.
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Python: Tips of the Day
Find current directory and file's directory:
To get the full path to the directory a Python file is contained in, write this in that file:
import os dir_path = os.path.dirname(os.path.realpath(__file__))
(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)
To get the current working directory use
import os cwd = os.getcwd()
Documentation references for the modules, constants and functions used above:
- The os and os.path modules.
- The __file__ constant
- os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
- os.path.dirname(path) (returns "the directory name of pathname path")
- os.getcwd() (returns "a string representing the current working directory")
- os.chdir(path) ("change the current working directory to path")
Ref: https://bit.ly/3fy0R6m
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