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Python concatenate string & list

Is it possible to concatenate a string and a list?

The following code causes the error: TypeError: not enough arguments for format string

t = ["a", "b", "c"]
s = "%s.%s.%s" % t

Answer 1

That could work if you convert your list to tuple like this:

t = ["a", "b", "c"]
s = "%s.%s.%s" % tuple(t)

But, python strings has the built in method .join, so, if your list grows, you can handle it like this:

'.'.join(t)

That’s the “pythonic way”, you also should avoid using the + operator with strings, always use .join and format strings. This is because Python Strings (and tuples) are not mutable objects, so, when you’re doing

"abc" + "cde"

Python has to allocate new memory to store the new string.

I hope this solved your question