尽管有逗号，python print语句打印换行符

Question

'2.6.5 (r265:79063, Apr 16 2010, 13:57:41) \\n[GCC 4.4.3]'

I have this

#! /usr/bin/env python

f = open('filetest', 'w')
f.write("This is a line")

f.close()

f = open('filetest', 'r')


for i in f.readlines():
    print i,

This prints the o/p like this:

$ ./filetest.py 
This is a line
abc@abc-ubuntu:~/pythonpractice$

I am wondering why does the prompt go to the newline after "This is a line" is printed? Because cat filestest gives this:

$ cat filetest
This is a lineabc@abc-ubuntu:~/pythonpractice$ 

Answer 1

This is standard behavior, afaik. You can use sys.output.write instead, or you can set sys.output.softspace=False to prevent the newline.

See this article for more details: http://code.activestate.com/lists/python-list/419182/

Answer 2

OR you can also use:

#! /usr/bin/env python
from __future__ import print_function

with open('filetest', 'w') as f1:
    f1.write("This is a line")

with open('filetest', 'r') as f2:
    for line in f2.readlines():
        print(line, end='')

Answer 3

from __future__ import print_function

for line in f:
    print(line, end="")