Differences

This shows you the differences between two versions of the page.

--- python:pythonbasicexamples [2020/02/26 15:57] – [Read and Update File] admin
+++ python:pythonbasicexamples [2022/10/29 16:15] (current) – external edit 127.0.0.1
@@ Line 218: / Line 218: @@
    with open(filename, "wb") as f:
       f.write(content)
+</code>
+===== Python Command Line Arguments =====
+refer: https://www.tutorialspoint.com/python/python_command_line_arguments.htm
+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 −
+<code bash>
+usage: test.py -i <inputfile> -o <outputfile>
+</code>
+Here is the following script to test.py −
+<code python>
+#!/usr/bin/python
+import sys, getopt
+def main(argv):
+   inputfile = ''
+   outputfile = ''
+   try:
+      opts, args = getopt.getopt(argv,"hi:o:",["ifile=","ofile="])
+   except getopt.GetoptError:
+      print 'test.py -i <inputfile> -o <outputfile>'
+      sys.exit(2)
+   for opt, arg in opts:
+      if opt == '-h':
+         print 'test.py -i <inputfile> -o <outputfile>'
+         sys.exit()
+      elif opt in ("-i", "--ifile"):
+         inputfile = arg
+      elif opt in ("-o", "--ofile"):
+         outputfile = arg
+   print 'Input file is "', inputfile
+   print 'Output file is "', outputfile
+if __name__ == "__main__":
+   main(sys.argv[1:])
+</code>
+Now, run above script as follows −
+  * Option1:<code bash>
+$ test.py -h
+</code>output:<code>
+test.py -i <inputfile> -o <outputfile>
+</code>
+  * Option2:<code bash>
+$ test.py -i inputfile
+</code>output:<code>
+Input file is " inputfile
+Output file is "
 </code>