小林编写一段文件读写操作代码， 文件如下图， 代码段如下：
file=open('ceshi.txt','w')
file.write("python is a programming language.")
file.close( )
file=open('ceshi.txt','r')
print(file.read( ))
该代码段运行后， 输出的结果为？ （ ）
IA Distributed System Based on Python.
python is a programming language.
IA Distributed System Based on Python. python is a programming language.
程序编译错误， 不会输出结果