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A convenient way to read all lines in a file is to use iteration with a for loop For example:
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for line in f: # Iterate over all lines in the file # Do something with line
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Be aware that in Python 2, the various read operations always return 8-bit strings, regardless of the file mode that was specified (text or binary) In Python 3, these operations return Unicode strings if a file has been opened in text mode and byte strings if the file is opened in binary mode The write() method writes a string to the file, and the writelines() method writes a list of strings to the file write() and writelines() do not add newline characters to the output, so all output that you produce should already include all necessary formattingThese methods can write raw-byte strings to a file, but only if the file has been opened in binary mode
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Standard Input, Output, and Error
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Internally, each file object keeps a file pointer that stores the byte offset at which the next read or write operation will occurThe tell() method returns the current value of the file pointer as a long integerThe seek() method is used to randomly access parts of a file given an offset and a placement rule in whence If whence is 0 (the default), seek() assumes that offset is relative to the start of the file; if whence is 1, the position is moved relative to the current position; and if whence is 2, the offset is taken from the end of the file seek() returns the new value of the file pointer as an integer It should be noted that the file pointer is associated with the file object returned by open() and not the file itselfThe same file can be opened more than once in the same program (or in different programs) Each instance of the open file has its own file pointer that can be manipulated independently The fileno() method returns the integer file descriptor for a file and is sometimes used in low-level I/O operations in certain library modules For example, the fcntl module uses the file descriptor to provide low-level file control operations on UNIX systems File objects also have the read-only data attributes shown in Table 92
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Table 92
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File Object Attributes Description
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Boolean value indicates the file state: False if the file is open, True if closed The I/O mode for the file Name of the file if created using open() Otherwise, it will be a string indicating the source of the file Boolean value indicating whether a space character needs to be printed before another value when using the print statement Classes that emulate files must provide a writable attribute of this name that s initially initialized to zero (Python 2 only) When a file is opened in universal newline mode, this attribute contains the newline representation actually found in the file The value is None if no newlines have been encountered, a string containing '\n', '\r', or '\r\n', or a tuple containing all the different newline encodings seen A string that indicates file encoding, if any (for example, 'latin-1' or 'utf-8') The value is None if no encoding is being used
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Attribute
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fclosed fmode fname fsoftspace
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fnewlines
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fencoding
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The interpreter provides three standard file objects, known as standard input, standard output, and standard error, which are available in the sys module as sysstdin, sysstdout, and sysstderr, respectively stdin is a file object corresponding to the stream of input characters supplied to the interpreter stdout is the file object that receives output produced by print stderr is a file that receives error messages More often than not, stdin is mapped to the user s keyboard, whereas stdout and stderr produce text onscreen
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9 Input and Output
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The methods described in the preceding section can be used to perform raw I/O with the user For example, the following code writes to standard output and reads a line of input from standard input:
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Alternatively, the built-in function raw_input(prompt) can read a line of text from stdin and optionally print a prompt:
name = raw_input("Enter your name : ")
Lines read by raw_input() do not include the trailing newlineThis is different than reading directly from sysstdin where newlines are included in the input text In Python 3, raw_input() has been renamed to input() Keyboard interrupts (typically generated by Ctrl+C) result in a KeyboardInterrupt exception that can be caught using an exception handler If necessary, the values of sysstdout, sysstdin, and sysstderr can be replaced with other file objects, in which case the print statement and input functions use the new values Should it ever be necessary to restore the original value of sysstdout, it should be saved firstThe original values of sysstdout, sysstdin, and sysstderr at interpreter startup are also available in sys_ _stdout_ _, sys_ _stdin_ _, and sys_ _stderr_ _, respectively Note that in some cases sysstdin, sysstdout, and sysstderr may be altered by the use of an integrated development environment (IDE) For example, when Python is run under IDLE, sysstdin is replaced with an object that behaves like a file but is really an object in the development environment In this case, certain lowlevel methods, such as read() and seek(), may be unavailable