Find Common Characters Between Two Strings

I am trying to print the common letters from two different user inputs using a for loop. (I need to do it using a for loop.) I am running into two problems: 1. My statement 'If cha

Solution 1:

You are trying to perform the Set Intersection. Python has set.intersection method for the same. You can use it for your use-case as:

>>> word_1 = 'one'>>> word_2 = 'toe'#    v join the intersection of `set`s to get back the string#    v                             v  No need to type-cast it to `set`.#    v                             v  Python takes care of it>>> ''.join(set(word_1).intersection(word_2))
'oe'

set will return the unique characters in your string. set.intersection method will return the characters which are common in both the sets.

---

If for loop is must for you, then you may use a list comprehension as:

>>> unique_1 = [w for w inset(word_1) if w in word_2]# OR# >>> unique_2 = [w for w inset(word_2) if w in word_1]
>>> ''.join(unique_1)  # Or, ''.join(unique_2)
'oe'

Above result could also be achieved with explicit for loop as:

my_str =''for w inset(word_1):
    if w in word_2:
        my_str += w

# where `my_str` will hold `'oe'`

Solution 2:

For this kind of problem, you're probably better off using sets:

wrd = 'one'
sec_wrd = 'toe'
wrd = set(wrd)
sec_wrd = set(sec_wrd)

print(''.join(sorted(wrd.intersection(sec_wrd))))

Solution 3:

Function to solve the problem

def find_common_characters(msg1,msg2):
    #to remove duplication set() is used.
    set1=set(msg1)
    set2=set(msg2)
    remove={" "}
    #if you wish to exclude space
    set3=(set1&set2)-remove
    msg=''.join(set3)
    return msg

Providing input and Calling the functionProvide different values for msg1,msg2 and test your program

msg1="python"
msg2="Python"
common_characters=find_common_characters(msg1,msg2)
print(common_characters)