(' + str(i) + ') 背后的逻辑是什么？

Question

I am new to programming, and stamp upon this line:

print('My name is')
for i in range(5):
   print('Jimmy Five Times (' + str(i) + ')')

I don't understand this part (' + str(i) + ')'), to be more specific, the + sign before and after str(i) [especially the + sign after str(i)].

I know the + sign is for strings concatenation, But in the above line, what is combined with what?

And what is the difference between the first example and say:

print('My name is')
for i in range(5):
    print('Jimmy five times ' + str(i))

Can someone give an example for a similar but complex example for such use?

Thanks.

edit: I realized that the string is Jimmy Five Times ( ,not Jimmy Five Times , that left and right brackets confused me. Thanks all for your quick responses.

Answer 1

+ concatenates strings, or if operands are numbers then adds them. Here you need to do str(i) because if i is not a string, then python tries to add them as integers, which is not possible. And the ending + ')' will add a closing parentheses to the string, and second example does not add parentheses. See yourself, first one will:

My name is
Jimmy Five Times (0)
Jimmy Five Times (1)
Jimmy Five Times (2)
Jimmy Five Times (3)
Jimmy Five Times (4)

And second one:

My name is
Jimmy five times 0
Jimmy five times 1
Jimmy five times 2
Jimmy five times 3
Jimmy five times 4

Answer 2

The sign + in the context of strings is used for string concatenation.

Specifically, in this example, the + operand is not defined for string and int ( i is an integer) so you first have to convert it to string by str(i) and then you can contact the strings.

Answer 3

For the first code mentioned, the first string 'Jimmy Five Times (' is concatenated with str(i) and then this str(i) is further concatenated with ')' so the final output is :

Jimmy Five Times (0)
Jimmy Five Times (1)
Jimmy Five Times (2)
Jimmy Five Times (3)
Jimmy Five Times (4)

Answer 4

Explanation

The sign + in the context of strings is used for string concatenation.

Specifically, in this example, the + operand is not defined for string and int (i is an integer) so you first have to convert it to string by str(i) and then you can contact the strings.

Output

First one's output:

My name is
Jimmy Five Times (0)
Jimmy Five Times (1)
Jimmy Five Times (2)
Jimmy Five Times (3)
Jimmy Five Times (4)

And second one's output:

My name is
Jimmy five times 0
Jimmy five times 1
Jimmy five times 2
Jimmy five times 3
Jimmy five times 4

Better solutions

using f' strings python 3.6 up

print(f'Jimmy Five Times ({i})')

using .format

print('My name is')
for i in range(5):
   print('Jimmy Five Times ({0})'.format(i))