itertools.permutations() python
itertools.permutations(iterable[, r]) This tool returns successive r length permutations of elements in an iterable. If r is not specified or is None, then r defaults to the length of the iterable, and all possible full length permutations are generated. Permutations are printed in a lexicographic sorted order. So, if the input iterable is sorted, the permutation tuples will be produced in a sorted order. Sample Code >>> from itertools import permutations >>> print permutations([
View Solution →itertools.combinations() python
itertools.combinations(iterable, r) This tool returns the r length subsequences of elements from the input iterable. Combinations are emitted in lexicographic sorted order. So, if the input iterable is sorted, the combination tuples will be produced in sorted order. Sample Code >>> from itertools import combinations >>> >>> print list(combinations('12345',2)) [('1', '2'), ('1', '3'), ('1', '4'), ('1', '5'), ('2', '3'), ('2', '4'), ('2', '5'), ('3', '4'), ('3', '5'), ('4', '5')] >>
View Solution →itertools.combinations_with_replacement() python
itertools.combinations_with_replacement(iterable, r) This tool returns r length subsequences of elements from the input iterable allowing individual elements to be repeated more than once. Combinations are emitted in lexicographic sorted order. So, if the input iterable is sorted, the combination tuples will be produced in sorted order. Sample Code >>> from itertools import combinations_with_replacement >>> >>> print list(combinations_with_replacement('12345',2)) [('1', '1'), ('1',
View Solution →Compress the String! python
In this task, we would like for you to appreciate the usefulness of the groupby() function of itertools . To read more about this function, Check this out . You are given a string S. Suppose a character 'c' occurs consecutively X times in the string. Replace these consecutive occurrences of the character 'c' with (X,c) in the string. For a better understanding of the problem, check the explanation. Input Format A single line of input consisting of the string S. Output Format
View Solution →Iterables and Iterators python
The itertools module standardizes a core set of fast, memory efficient tools that are useful by themselves or in combination. Together, they form an iterator algebra making it possible to construct specialized tools succinctly and efficiently in pure Python. To read more about the functions in this module, check out their documentation here. You are given a list of N lowercase English letters. For a given integer k, you can select any k indices (assume 1-based indexing) with a uniform prob
View Solution →