Execute the Python code contained in script, which must be a filesystem path absolute or relative referring to either a Python file, a directory containing. I need to get the line number of a phrase in a text file. The phrase could be the dog barked I need to open the file, search it for that phrase and print the line. Python File readline Method Learn Python in simple and easy steps starting from basic to advanced concepts with examples including Python Syntax Object Oriented. Python Command Line Arguments. Python provides a getopt module that helps you parse command line options and arguments. The line above, which again should work for Linux or Mac, will open a new file in vim, the commandline text editor that I prefer. You can follow along, or feel free. How can I get the file name and line number in python script. Exactly the file information we get from an exception traceback. In this case without raising an exception. Builtin Functions The Python interpreter has a number of functions built into it that are always available. They are listed here in alphabetical order. The official home of the Python Programming Language. OYy.png' alt='Python Print Line Number In File' title='Python Print Line Number In File' />The Python sys module provides access to any command line arguments via the sys. This serves two purposes sys. Here sys. argv0 is the program ie. Example. Consider the following script test. Number of arguments, lensys. Argument List, strsys. Now run above script as follows. Python Print Line Number In File' title='Python Print Line Number In File' />Php The mbstring package adds UTF8 aware string functions with mb prefixes. We assume that os, re, and sys are always imported. Grammar and Execution. This produce following result. Number of arguments 4 arguments. Argument List test. NOTE As mentioned above, first argument is always script name and it is also being counted in number of arguments. Parsing Command Line Arguments. Python provided a getopt module that helps you parse command line options and arguments. Regex-Master_1.png' alt='Python Print Line Number In File' title='Python Print Line Number In File' />This module provides two functions and an exception to enable command line argument parsing. This method parses command line options and parameter list. Following is simple syntax for this method. Here is the detail of the parameters args This is the argument list to be parsed. This is the string of option letters that the script wants to recognize, with options that require an argument should be followed by a colon. This is optional parameter and if specified, must be a list of strings with the names of the long options, which should be supported. Long options, which require an argument should be followed by an equal sign. To accept only long options, options should be an empty string. This method returns value consisting of two elements the first is a list of option, value pairs. The second is the list of program arguments left after the option list was stripped. Each option and value pair returned has the option as its first element, prefixed with a hyphen for short options e. Exception getopt. Getopt. Error. This is raised when an unrecognized option is found in the argument list or when an option requiring an argument is given none. The argument to the exception is a string indicating the cause of the error. The attributes msg and opt give the error message and related option. Example. Consider we want to pass two file names through command line and we also want to give an option to check the usage of the script. Usage of the script is as follows. Here is the following script to test. Camp Flog Gnaw Patch on this page. Getopt. Error. print test. Input file is, inputfile. Output file is, outputfile. Now, run above script as follows. BMP o. usage test. Input file is inputfile.