在 python 中写入文件后文件处理程序未打印

Question

我正在尝试写入一个文件并在写入后读取。下面是我的代码。

with open('1.txt','w') as fr:
    x = '3'
    fr.write(x)
    with open('1.txt','r') as fr_r:
        fr_w = fr_r.read()
        print (fr_w)

预期输出低于

3

Answer 1

你的代码应该是这样的（第二个没有缩进）

with open('1.txt','w') as fr:
    x = '3'
    fr.write(x)
with open('1.txt','r') as fr_r:
    fr_w = fr_r.read()
    print (fr_w)

Answer 2

一旦您使用 'with' 语句打开文件。你不需要关闭那个频道。出于这个原因 python 开发人员设置了一个限制，不能在此块中写入或使用另一个权限通道。

                   once read /write permission in opened we cannot add another permission channel in that block or indentation. it should be in seperate indentation like this below as follows``

在 python 中写入文件后文件处理程序未打印

file handler is not printing after writing in to file in python

python

file-io