Python: Count number of unique lists within list
Python List: Exercise - 94 with Solution
Write a Python program to count number of unique sublists within a given list.
Sample Solution:
Python Code:
def unique_sublists(input_list):
result ={}
for l in input_list:
result.setdefault(tuple(l), list()).append(1)
for a, b in result.items():
result[a] = sum(b)
return result
list1 = [[1, 3], [5, 7], [1, 3], [13, 15, 17], [5, 7], [9, 11]]
print("Original list:")
print(list1)
print("Number of unique lists of the said list:")
print(unique_sublists(list1))
color1 = [["green", "orange"], ["black"], ["green", "orange"], ["white"]]
print("\nOriginal list:")
print(color1)
print("Number of unique lists of the said list:")
print(unique_sublists(color1))
Sample Output:
Original list: [[1, 3], [5, 7], [1, 3], [13, 15, 17], [5, 7], [9, 11]] Number of unique lists of the said list: {(1, 3): 2, (5, 7): 2, (13, 15, 17): 1, (9, 11): 1} Original list: [['green', 'orange'], ['black'], ['green', 'orange'], ['white']] Number of unique lists of the said list: {('green', 'orange'): 2, ('black',): 1, ('white',): 1}
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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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