Filenameis'zen_of_python.txt'.Fileisclosed. 1. 2. 但是此时是不可能从文件中读取内容或写入文件的,关闭文件时,任何访问其内容的尝试都会导致以下错误: 复制 f.read() 1. Output: 复制 ---ValueErrorTraceback(mostrecentcalllast)~\AppData\Local\Temp/ipykernel_9828/3059900045.pyin<module>--->1f.r...
if f.closed: print("File is closed.") else: print("File isn't closed.") Output: Filename is 'zen_of_python.txt'. File is closed. 但是此时是不可能从文件中读取内容或写入文件的,关闭文件时,任何访问其内容的尝试都会导致以下错误: f.read() Output: --- ValueError Traceback (most recent ...
print("Filename is '{}'.".format(f.name)) iff.closed: print("File is closed.") else: print("File isn't closed.") Output: Filename is 'zen_of_python.txt'. File is closed. 但是此时是不可能从文件中读取内容或写入文件的,关闭文件时,任何访问其内容的尝试都会导致以下错误: f.read Outpu...
A closed file cannot be used for further I/O operations. close() may be called more than once without error. Some kinds of file objects (for example, opened by popen()) may return an exit status upon closing. """ def fileno(self): # real signature unknown; restored from __doc__ ...
closed #标记文件是否已经关闭,由close()改写 encoding #文件编码 mode #打开模式 name #文件名 newlines #文件中用到的换行模式,是一个tuple softspace #boolean型,一般为0,据说用于print file的读写方法: F.read([size]) #size为读取的长度,以byte为单位 ...
Here are some of the functions in Python that allow you to read and write to files: read() :This function reads the entire file and returns a string readline() :This function reads lines from that file and returns as a string. It fetch the line n, if it is been called nth time. ...
要使用csv模块读取一个 CSV 文件,首先使用open()函数 ➋ 打开它,就像您处理任何其他文本文件一样。但不是在open()返回的File对象上调用read()或readlines()方法,而是将其传递给csv.reader()函数 ➌。这将返回一个reader对象供您使用。注意,您没有将文件名字符串直接传递给csv.reader()函数。
read()) print("after with语句:", f.closed) 同时打开两个文件对象( python2中不支持) 代码语言:javascript 代码运行次数:0 运行 AI代码解释 with open('/tmp/passwd') as f1, open('/tmp/passwdBack', 'w+') as f2: # 将第一个文件的内容写入第二个文件中,文件复制即使如此。 f2.write(f1....
2.操作文件class file(object) def close(self): # real signature unknown; restored from __doc__ 关闭文件 """ close() -> None or (perhaps) an integer. Close the file. Sets data attribute .closed to True. A closed file cannot be used for ...
for row in read_csv: ValueError: I/O operation on closed file. Process finished with exit code 1 因为异常处理语句with 发生 ValueError: I/O operation on closed file 错误。 如前所述,with 语句创建一个异常处理块,一旦编译器离开该块,内部启动的任何操作都会终止。