python-3.x – Python错误消息io.UnsupportedOperation：不可读

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("\n")

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

它显示以下错误消息：

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

UnsupportedOperation: not readable

使用w你将无法读取文件.请改用以下内容：

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

此外,以下是其他选项：

"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.