How to copy a string to another string in python

Question

I have two strings, s1 and s2, and I need to find if there are letters in common in both of them and make it double for example:

s1 = "Hello World"
s2 = "lo"
output = "Helllloo Woorlld"

My code:

s2="lo"
s1="Hello World"

    def Str_dup(s1,s2):
        s3=str()
        d=dict()
        for i in s2:
            d[i]=True
            print i
            w=0
        for w in range(len(s1)):
            if d[s1[w]]:
                s3[w]=s3[w]+s1[w]
            else :
                s3[w]=s1[w]
        return s3
    Str_dup(s1,s2)

I get an error on:

    if d[s2[w]]:
IndexError: string index out of range

s1 is longer than s2, so obviously w is too big sometimes to get s2[w]. Also you can't modify a string as in s3[w]=.... You need to make a list of characters and then combine them into a string with ''.join(list_of_chars). — Alex Hall
– Alex Hall, Commented May 6, 2017 at 10:58
"string index out of the range"?! Please just copy and paste the literal text, it makes it far less likely you'll provide inaccurate information. — jonrsharpe
– jonrsharpe, Commented May 6, 2017 at 11:00

Mureinik · Accepted Answer · 2017-05-06 10:58:51Z

2

It would be so much easier to treat the strings as lists of characters and use list comprehension to construct the output string:

output = ''.join([c*2 if c in s2 else c for c in s1])

answered May 6, 2017 at 10:58

Mureinik

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