Python 错误消息 io.UnsupportedOperation:不可读 [英] Python error message io.UnsupportedOperation: not readable

问题描述

我做了一个简单的程序，但运行时显示以下错误:

I made a simple program but It shows the following error when I run it:

line1 = []
line1.append("xyz ")
line1.append("abc")
line1.append("mno")

file = open("File.txt","w")
for i in range(3):
    file.write(line1[i])
    file.write("
")

for line in file:
    print(line)
file.close()

它显示此错误消息:

文件C:/Users/Sachin Patil/fourth,py.py"，第 18 行，
对于文件中的行:

File "C:/Users/Sachin Patil/fourth,py.py", line 18, in
for line in file:

UnsupportedOperation:不可读

UnsupportedOperation: not readable

推荐答案

您正在打开文件为 "w"，代表可写.

You are opening the file as "w", which stands for writable.

使用 "w" 您将无法读取文件.请改用以下内容:

Using "w" you won't be able to read the file. Use the following instead:

file = open("File.txt","r")

此外，还有其他选项:

"r"   Opens a file for reading only.
"r+"  Opens a file for both reading and writing.
"rb"  Opens a file for reading only in binary format.
"rb+" Opens a file for both reading and writing in binary format.
"w"   Opens a file for writing only.
"a"   Open for writing.  The file is created if it does not exist.
"a+"  Open for reading and writing.  The file is created if it does not exist.

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