Python: Extract specified number of elements from a given list, which follows each other continuously
Python List: Exercise - 103 with Solution
Write a Python program to extract specified number of elements from a given list, which follows each other continuously.
Sample Solution:
Python Code:
from itertools import groupby
def extract_elements(nums, n):
result = [i for i, j in groupby(nums) if len(list(j)) == n]
return result
nums1 = [1, 1, 3, 4, 4, 5, 6, 7]
n = 2
print("Original list:")
print(nums1)
print("Extract 2 number of elements from the said list which follows each other continuously:")
print(extract_elements(nums1, n))
nums2 = [0, 1, 2, 3, 4, 4, 4, 4, 5, 7]
n = 4
print("Original lists:")
print(nums2)
print("Extract 4 number of elements from the said list which follows each other continuously:")
print(extract_elements(nums2, n))
Sample Output:
Original list: [1, 1, 3, 4, 4, 5, 6, 7] Extract 2 number of elements from the said list which follows each other continuously: [1, 4] Original lists: [0, 1, 2, 3, 4, 4, 4, 4, 5, 7] Extract 4 number of elements from the said list which follows each other continuously: [4]
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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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