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I have some code which will read two strings from the user: name1 = input("Enter name 1: ") name2 = input("Enter name 2: ") Later, I want to format those strings into a longer string for printing: if len(name1) > len(name2): print ("'{0}' is longer than '{1}'"% name1, name2) But I get an error message that looks like: Traceback (most recent call last): File "program.py", line 13, in <module> print ("'{0}' is longer than '{1}'"% name1, name2) TypeError: not all arguments converted during string formatting What is wrong with the code? How should I write this line instead, in order to format the string properly? See also String formatting: % vs. .format vs. f-string literal for in-depth comparison of the most common ways to do this kind of string formatting, and How do I put a variable’s value inside a string (interpolate it into the string)? for a general how-to guide for this kind of string construction. See Printing tuple with string formatting in Python for another common cause of the error.

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