[Python] Why do I get "TypeError: not all arguments converted during string formatting" trying...

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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