python在拼接字符串时，通过参数连接时就执行报错，写死执行的文件就不报错，为什么会这样？

Question

        for item in testfiles:
           #subprocess.call("python ..\\TestCases\\" + str(item).replace("\\n", ""), shell=True)
           print "修改前：" + os.getcwd()
           os.chdir('/Users/yirong/PycharmProjects/CloudResWebTest/TestCases')
           print "修改后：" + os.getcwd()
                         #这样子报错，我将command打印出来也是python TC_Search_Python.py
           command="python "+str(item) 
                         #这样子执行正常
           #command="python TC_Search_Python.py"
           print command
           subprocess.call(command,shell=True)

Answer 1

http://www.jb51.net/article/95444.htm