每隔一行添加一个空格，并在文本文件中每隔一行合并 Python

Question

I have a text file of lets say this content

a
b
c
d
e
f

I want python to read the textfile and edit it to this, add whitespace to the start of every second line then merge with first line above, this is what it should look like

a b
c d
e f

How can I achieve this?

I written gotten this together but it only prints and doesn't save the contents to existing file, doesn't add white space

with open("text.txt", encoding='utf-8') as f:
    content = f.readlines()
    str = ""
    for i in range(1,len(content)+1):
        str += content[i-1].strip()
        if i % 2 == 0:
            print(str)
            str = ""

Answer 1

I would suggest differnt approch this also may works.

with open("text.txt") as file_in:
lines = []
for line in file_in:
    lines.append(line)

#lines ['a\n', 'b\n', 'c\n', 'd']

lines = [x.replace('\n', '') for x in lines]
for x in range(0,len(lines),2):
    print (lines[x], lines[x+1])

should give

a b
c d
e f

or else you can simply append spaces to list as follows and print accordingly.

for b in range (0,len(lines)-1):
    
    lines.insert(b*3,' ') 

lines.pop(0) # ['a', 'b', ' ', 'c', 'd', ' ']
lines= ''.join(lines)
for word in lines.split():
    print(word)

Gives

ab
cd