为什么我在第10行收到无效的语法？

Question

 # this program says hello and ask my name.
 print('Hello World')
 print('Whats your name?')
 myname = input()
 print('its good to meet you, ' + myname) #ask for my name
 print('the length of your name is : ')
 print(len(myname))
 print('whats your age?')#ask for my age
 myage = input()
 print('you  will be ' + str(int(myage) + 1) + 1 'in a year')

I see syntax error at line 10 of the code i see all the parenthesis are correctly placed.

Answer 1

I think this is what you want based on the logic of your program

print('you will be ' + str(int(myage) + 1) + ' in a year')

output:

Hello World
Whats your name?
Jon Doe
its good to meet you, Jon Doe
the length of your name is : 
7
whats your age?
23
you will be 24 in a year

Edit: OP wants me to explain when to use + in print() . usually if you are printing more than one arguments in your print() statement you want to join them using + . and when you join arguments together remember their type have to be the same. so for example. print(1 + '2') would give you an error because 1 is a int and '2' is a str . you would have to cast the arguments to make them the same. so print(1 + int('2')) would correctly give you 3

Answer 2

You got an extra 1 . change print('you will be ' + str(int(myage) + 1) + 1 'in a year') to

print('you will be ' + str(int(myage) + 1) + ' in a year')

Answer 3

Check your code here

Try :

# this program says hello and ask my name.
print('Hello World')
print('Whats your name?')
myname = input()
print('its good to meet you, ' + myname) #ask for my name
print('the length of your name is : ')
print(len(myname))
print('whats your age?')#ask for my age
myage = input()
print('you  will be ' + str(int(myage) + 1) + ' in a year')

Answer 4

Following will solve your problem:

print('Hello World')
print('Whats your name?')
myname = raw_input()
print('its good to meet you, ' + myname) #ask for my name
print('the length of your name is : ')
print(len(myname))
print('whats your age?')#ask for my age
myage = raw_input()
print("you  will be " + str(int(myage) + 1) + " years old by next year")

You have missed out the '+' in your line 10 to concatenate your strings. Also there was an unwanted '+ 1' which would have caused another error for you as you were trying to concatenate int and str objects.

Another correction, I have changed the input() function with raw_input() , as I am using python2. If you need any better explanation on this chnage, you could check this link .

Answer 5

you should have a string in this command:

print('you  will be ' + str(int(myage) + 1) + 1 'in a year')

these are your strings: 'you will be ' and str(int(myage) + 1) and 'in a year' . but you are wrong in writing 1 'in a year' . this is not string. i think you don't need to the second "1". you can write:

print('you  will be ' + str(int(myage) + 1) +'in a year')