给定一个字符串 S，将其偶数索引字符和奇数索引字符作为 2 个空格分隔的字符串打印在一行中

Question

I know it can be simply done through string slicing but i want to know where is my logic or code is going wrong. Please Help!

S=input()
string=""
string2=""
list1=[]
list1[:0]=S
for i in list1:
    if(i%2==0):
        string=string+list1[i]
    else:
        string2=string2+list1[i]
print(string," ",string2)

Here's my code. Firstly i stored each character of string in the list and went by accessing the odd even index of the list. But i'm getting this error

if(i%2==0):
TypeError: not all arguments converted during string formatting

Answer 1

You are iterating over characters, not indices, so your modulo is incorrect, equivalent to:

i = "a"
"a" % 2 == 0

You want to use enumerate

for idx, letter in enumerate(list1):
    if(idx%2 == 0)
         string += letter

Answer 2

You don't need to use an intermediate list: just iterate over the input string directly. You also need to use for i in range(len(original)) rather than for i in original , because you need to keep track of whether a given character is at an odd or an even index. (I've gone ahead and renamed some of the variables for readability.)

S = input()
even_index_characters = ""
odd_index_characters = ""

for i in range(len(S)):
    if i % 2 == 0:
        even_index_characters += S[i]
    else:
        odd_index_characters += S[i]

print(f"{even_index_characters} {odd_index_characters}")