Print 4 letter combinations of a string without using lists or itertools-CodePudding

we are to write a function that takes a single parameter string, and then outputs each 4 letter permutation from the possible combinations of the string. so for example even if it is a 5 letter word you have to return all 4 letter combinations of the string. it can also only be solved iteratively so no recursion.

currently i've tried using nested for loops, so for instance

for i in word:
    for x in word:
        for z in word:
            for y in word:
                print(y)
            print(z)
        print(x)
    print(i)

However the issue i'm coming across is that firstly, i'm not sure on how I would concatenate these outputs into a single string output given that i cannot use lists or any form of sets/dictionaries/tuples etc. secondly, how exactly would i avoid duplicate strings?

CodePudding user response：

You can just use a operator to join two strings together:

a = 'str1'
b = 'str2'
c = a   b
print(c)

output:

'st1str2'

So you can use this to join together i, x, z and y into one string, and print it as 1 'word'.

CodePudding user response：

The question is not very clear so I suppose that for word='abcd' you have to print the words: 'abcd', 'aabc', aaab' and so on. I suppose that a single letter can be present more than one time in the different combinations of letters.

In this condition try this code (that exactly the solution of @Emi OB)

word="abcd"
for i in word:
    for x in word:
        for z in word:
            for y in word:
                print(i   x   z   y)