"7" + 1 should be 71 Why Python occur an exception?

Answer 1

you can't add two operands with different types

Answer 2

Plus sign joins strings but in this case the number 1 is an integer.
You should do "7" + str(1) to get '71'

Answer 3

you are trying to add numbers with string. it does not work in python , if trying to multiply string to an integer, oh yes , all right

Answer 4

"7" is string and 1 is number. so it can't be added by + operands.

Answer 5

Python won't implicitly coerce types on must cases, string addition is one of those.

Answer 6

if you want to add string and integer you can use: str(value)+ int_value.

Answer 7

Thanks for good answers. In many other languages like JavaScript you can and string to number implicitly.