A simple and practical example of the Fileinput module in Python

These days have such a demand, to the user login system information statistics, made a report. When the user logs on successfully, the server will write a log file in the archive like the following: "datetime @ User name @ip", so the journal file is born into one. So, all we have to do is make a calendar of these log files, extract all the login information, and reorganize the data format. Writing an analysis tool in Python is very simple, you would say, using glob to get all the log files, and then open (logfile) for each log file, and then a line of reading, or Os.walk, is also very simple. In fact, the standard library provides another auxiliary module, we can do this work very conveniently, that is fileinput. Below we will use Fileinput to compile all the text files under the D disk, and print out the length of each line:

Import fileinputfrom glob import glob for line in Fileinput.input (Glob (R ' D:/*.txt ')):  print Fileinput.lineno (), U ' file : ', Fileinput.filename (),/      U ' line number: ', Fileinput.filelineno (), u ' length: ', Len (Line.strip ('/n ')) Fileinput.close ()

The code is very simple and straightforward. Input () accepts a list of all file paths to be compiled, returns the file name of the file currently being read through filename (), Filelineno () returns the line number of the currently read row, and Lineno () returns the number (or ordinal) of the currently read row. In fact, the module internally through the Fileinput class to implement the file's calendar reading, input () in the internal creation of an object of the class, when the data row is finished, the Fileinput.close () to close the internal object.

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