如何在 CodeHS 8.4.4: How Many Names 中打印名称？

Question

This is what I'm supposed to do:

The first part of this exercise is the same as the first part of How Many Names? in the Control Flow module.

Some people have just a first name and a last name. Some people also have a middle name. Some people have five middle names.

Write a program that asks the user how many names they have. (If they have a first name, two middle names, and a last name, for example, they would type 4.) Then, using a for loop, ask the user for each of their names. Store the names in a list.

Then, use slices to separately print the person's first name, middle name(s), and last name.

An example run of your program might look like this:

Number of names: 4
Name: Nora
Name: Stanton
Name: Blatch
Name: Barney
First name: Nora
Middle name(s): ['Stanton', 'Blatch']
Last name: Barney
Your program should work regardless of how many middle names the person has!

Hints

The index -1 may come in handy in a couple places. You'll need to use the str function to print the middle names.

I have found the correct answer to this problem. Here it is:

name_amount = int(input("How many names do you have? "))
namelist = []
index = 0
for i in range (name_amount):
    name = input("Name: ")
    namelist.append(name)
    index += 1
print "First name: " + namelist[0]
print "Middle names: " + str(namelist[1:-1])
print "Last name: " + namelist[-1]

Answer 1

You issue is in this line here:

print "Middle names: " + namelist[1:-1]

When you have more than 1 middle name namelist[1:-1] will be a list at least 2 long. The + you use in this line is trying to concatenate the string "Middle Names: " with the list ["middlename1","middlename2"] and Python doesn't know what to do here so it thrown the exception:

TypeError: cannot concatenate 'str' and 'list' objects

To fix this and get the format you want for the middle names ( Middle name(s): ['Stanton', 'Blatch'] ) you need to tell python to turn the list into a string with str() so your line should be:

print "Middle names: " + str(namelist[1:-1])

This will force python to turn your list into a string that can be concatenated and printed.

Answer 2

还要在要打印的行周围添加括号，例如：

print("Middle names: " + str(namelist[1:-1]))