Python: Find the characters which occur in more than and less than a given number in list of strings
Python Collections: Exercise-25 with Solution
Write a Python program to find the characters in a list of strings which occur more than and less than a given number.
Sample Solution:
Python Code:
from collections import Counter
from itertools import chain
def max_aggregate(list_str, N):
temp = (set(sub) for sub in list_str)
counts = Counter(chain.from_iterable(temp))
gt_N = [chr for chr, count in counts.items() if count > N]
lt_N = [chr for chr, count in counts.items() if count < N]
return gt_N, lt_N
list_str = ['abcd', 'iabhef', 'dsalsdf', 'sdfsas', 'jlkdfgd']
print("Original list:")
print(list_str)
N = 3
result = max_aggregate(list_str, N)
print("\nCharacters of the said list of strings which occur more than:",N)
print(result[0])
print("\nCharacters of the said list of strings which occur less than:",N)
print(result[1])
Sample Output:
Original list: ['abcd', 'iabhef', 'dsalsdf', 'sdfsas', 'jlkdfgd'] Characters of the said list of strings which occur more than: 3 ['a', 'd', 'f'] Characters of the said list of strings which occur less than: 3 ['c', 'b', 'h', 'e', 'i', 's', 'l', 'k', 'j', 'g']
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Previous: Write a Python program to calculate the maximum aggregate from the list of tuples (pairs).
Next: Write a Python program to find the difference between two list including duplicate elements. Use collections module.
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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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