1. 使用EOF(End of File) EOF是指文件的末尾。在Python中,我们可以使用文件对象的read方法和readline方法来读取文件内容,当文件已经读取完毕时,这两个方法都会返回空字符串。因此,我们可以通过判断返回结果是空字符串来判断文件是否已经读取完毕。 withopen('file.txt','r')asfile:w
在这种情况下,我们可以使用try/except语句来处理异常。 withopen('file.txt','r')asfile:try:line=file.readline()whileline!='':print(line)line=file.readline()exceptEOFError:print("Reached end of file.")exceptExceptionase:print("An error occurred:",str(e)) 1. 2. 3. 4. 5. 6. 7. 8. ...
file.readline([size]) 读取整行,包括 "\n" 字符。 8 file.readlines([sizeint]) 读取所有行并返回列表,若给定sizeint>0,返回总和大约为sizeint字节的行, 实际读取值可能比 sizeint 较大, 因为需要填充缓冲区。 9 file.seek(offset[, whence]) 设置文件当前位置 10 file.tell() 返回文件当前位置。 11 ...
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Python中统称为file-like Object。除了file外,还可以是内存的字节流,网...
" "is_config_file = {}".format(is_config_file)) return ERR, "" sha256_obj = sha256() with open(file_path_real, "rb") as fhdl: if is_config_file is True: # skip the first line fhdl.seek(0) fhdl.readline() for chunk in read_chunks(fhdl): sha256_obj.update(chunk) sha...
In the example, we read 4, 20, and 10 characters from the file. $ ./read_characters.py Lost Illusions Beatrix H onorine Th Python readlineThe readline function reads until newline or EOF and return a single string. If the stream is already at EOF, an empty string is returned. If ...
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...
f=open('myfile.txt') s=f.readline() i=int(s.strip()) exceptOSErroraserr: print("OS error: {0}".format(err)) exceptValueError: print("Could not convert data to an integer.") except: print("Unexpected error:",sys.exc_info()[0]) ...
('a.txt','r',encoding='utf-8') as f: data1=f.readline() #读取文件每一行内容 print(data1,end='') #print()函数自带换行,使用end=''去掉换行 data2=f.readline() print(data2) data3=f.readline() print(data3) with open('a.txt','r',encoding='utf-8') as f: data=f.readlines(...
print myfile.readline() # empty string: end of file myfile.close() 读文本文件 input = open('data', 'r') #第二个参数默认为r input = open('data') 读固定字节 file_object = open('abinfile', 'rb') try: while True: chunk = file_object.read(100) ...