写入

当文件以写模式打开时，文件的已有内容被删除

file = open("newfile.txt", "r")
print("初始化读写内容")
print(file.read())
print("完成")
file.close()

file = open("newfile.txt", "w")
file.write("新的内容")
file.close()

file = open("newfile.txt", "r")
print("写入新的内容")
print(file.read())
print("结束")
file.close()

结果
>>>