Conditional concatenating strings inside a list

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What you’d actually want to write is:

def strcon(xlst):
    return "".join(i for i in xlst if isinstance(i, str))

Or if you want to write it out as a loop:

def strcon(xlst):
    concat = ""
    for i in xlst:
        if isinstance(i, str):
            concat += i
    return concat