读取文件的方法还有很多,除了read( )一次性读取全部内容外,还有: read(size),每次读取size个字节的内容,适合于未知文件大小的读取; readline( ),每次读取一行内容; readlines( ),一次性读取所有内容,并按行返回list,适用于配置文件的读取。 file-like Object:像open()函数返回的这种有个read()方法的对象,在Pytho...
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...
print("Filename is '{}'.".format(f.name)) 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()...
# Maximum number of file downloading retries. MAX_TIMES_RETRY_DOWNLOAD = 3 MAX_TIMES_RETRY = 5 DELAY_INTERVAL = 10 # Define the file length. FELMNAMME_127 = 127 FELMNAMME_64 = 64 FELMNAMME_4 = 4 FELMNAMME_5 = 5 # Mode for activating the device deployment file EFFECTIVE_MODE_REBOOT...
file.close() 关闭文件。关闭后文件不能再进行读写操作。 2 file.flush() 刷新文件内部缓冲,直接把内部缓冲区的数据立刻写入文件, 而不是被动的等待输出缓冲区写入。 3 file.fileno() 返回一个整型的文件描述符(file descriptor FD 整型), 可以用在如os模块的read方法等一些底层操作上。 4 file.isatty() 如...
read_file.py #!/usr/bin/python with open('works.txt', 'r') as f: for line in f: print(line.rstrip()) The example iterates over the file object to print the contents of the text file. $ ./read_file.py Lost Illusions Beatrix Honorine The firm of Nucingen Old Goriot Colonel ...
with open('file.log') as file: read_data = file.read() except FileNotFoundError as fnf_error: print(fnf_error) except : #except子句可以忽略异常的名称,将被当作通配符使用,可以使用这种方法打印一个错误信息,然后再次把异常抛出,raise print("Unexpected error:", sys.exc_info()[0]) ...
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 call last) ~\AppData\Local\Temp/ipykernel_9828/3059900045.py in <module...
deftest_3():try:f=open("hello.txt","r")try:print(f.read(6))# hello.ofhello.txtexcept:print("read file except")finally:print("release resource")f.close()except IOError:print("file not exist")# file not exist # raise显示地引发异常,raise后面的语句将不能执行 ...
Return an empty string at EOF."""passdefreadlines(self, size=None):#real signature unknown; restored from __doc__读取所有数据,并根据换行保存值列表"""readlines([size]) -> list of strings, each a line from the file. Call readline() repeatedly and return a list of the lines so read. ...