Python: Generate combinations of an given iterable
Python Itertools: Exercise-11 with Solution
Write a Python program to generate combinations of a given length of given iterable.
Sample Solution:
Python Code:
import itertools as it
def combinations_data(iter, length):
return it.combinations(iter, length)
#List
result = combinations_data(['A','B','C','D'], 1)
print("\nCombinations of an given iterable of length 1:")
for i in result:
print(i)
#String
result = combinations_data("Python", 1)
print("\nCombinations of an given iterable of length 1:")
for i in result:
print(i)
#List
result = combinations_data(['A','B','C','D'], 2)
print("\nCombinations of an given iterable of length 2:")
for i in result:
print(i)
#String
result = combinations_data("Python", 2)
print("\nCombinations of an given iterable of length 2:")
for i in result:
print(i)
Sample Output:
Combinations of an given iterable of length 1: ('A',) ('B',) ('C',) ('D',) Combinations of an given iterable of length 1: ('P',) ('y',) ('t',) ('h',) ('o',) ('n',) Combinations of an given iterable of length 2: ('A', 'B') ('A', 'C') ('A', 'D') ('B', 'C') ('B', 'D') ('C', 'D') Combinations of an given iterable of length 2: ('P', 'y') ('P', 't') ('P', 'h') ('P', 'o') ('P', 'n') ('y', 't') ('y', 'h') ('y', 'o') ('y', 'n') ('t', 'h') ('t', 'o') ('t', 'n') ('h', 'o') ('h', 'n') ('o', 'n')
Python Code Editor:
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Previous: Write a Python program to create an iterator to get specified number of permutations of elements.
Next: Write a Python program to create Cartesian product of two or more given lists using itertools.
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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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