一个小脚本，为什么进不了这个判断？

test.py

import os,sys

os.system("echo \"================are you ok ? =====================\"")

def execCmd(cmd):
    r = os.popen(cmd)
    text = r.read()
    r.close()
    return text

action = sys.argv[1]

if action=="test":
        exeResult = os.popen("cat test1.txt")
        results = exeResult.readlines()
        exeResult.close()

        for result in results:
                print(result)
                if result == "hello world":
                        print("hello!")
        print("execute finally")


else:
        os.system("echo \">>>>>>>>>>>>>No Action Defind\"")

test1.txt 内容

this text from test1
my name is dd
hello world

输出:

================are you ok ? =====================
this text from test1

my name is dd

hello world

execute finally

为什么出不来那个 hello?