在字符串中以"+"号联接列表项 [英] Join items of a list with '+' sign in a string

问题描述

我希望输出为:

Enter a number : n
List from zero to your number is : [0,1,2,3, ... , n]
0 + 1 + 2 + 3 + 4 + 5 ... + n = sum(list)

但是我的实际输出是:

Enter a number : 5
List from zero to your number is :  [0, 1, 2, 3, 4, 5]
[+0+,+ +1+,+ +2+,+ +3+,+ +4+,+ +5+] =  15

我正在使用join，因为它是我所知道的唯一类型.

I'm using join as it's the only type I know.

为什么在项目周围打印加号?为什么在空格周围?

Why are the plus signs printed around the items and why are they surrounding blank spaces?

我应该如何将list的值打印到字符串中以供用户阅读?

How should I print the list's values into a string for the user to read ?

谢谢.这是我的代码:

##Begin n_nx1 application
n_put = int(input("Choose a number : "))

n_nx1lst = list()
def n_nx1fct():
    for i in range(0,n_put+1):
        n_nx1lst.append(i)
    return n_nx1lst

print ("List is : ", n_nx1fct())
print ('+'.join(str(n_nx1lst)) + " = ", sum(n_nx1lst))

推荐答案

将list中的每个int元素更改为.join调用中的str，而不是使用generator expression:

Change each individual int element in the list to a str inside the .join call instead by using a generator expression:

print("+".join(str(i) for i in n_nx1lst) + " = ", sum(n_nx1lst))    

在第一种情况下，您是在整个list上而不是在该list中的单个元素上调用str.结果，它连接列表表示中的每个字符，如下所示:

In the first case, you're calling str on the whole list and not on individual elements in that list. As a result, it joins each character in the representation of the list, which looks like this:

'[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]'

带有+符号的

会产生您所看到的结果.

with the + sign yielding the result you're seeing.

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