How do I run Python script using arguments in windows command line

Question

This is my python hello py script   def hello a b       print  hello and that s your sum       sum a b     print sum     import sys  if   name         main         hello sys argv 2     The problem is that it can t be run from the windows command line prompt  I used this command   C  Python27 gt hello 1 1   But it didn t work unfortunately  may somebody please help

User · Answer

There are more than a couple of mistakes in the code.

'import sys' line should be outside the functions as the function is itself being called using arguments fetched using sys functions.
If you want correct sum, you should cast the arguments (strings) into floats. Change the sum line to --> sum = float(a) + float(b).
Since you have not defined any default values for any of the function arguments, it is necessary to pass both arguments while calling the function --> hello(sys.argv[2], sys.argv[2])

import sys def hello(a,b): print ("hello and that's your sum:") sum=float(a)+float(b) print (sum)

if __name__ == "__main__": hello(sys.argv[1], sys.argv[2])

Also, using "C:\Python27>hello 1 1" to run the code looks fine but you have to make sure that the file is in one of the directories that Python knows about (PATH env variable). So, please use the full path to validate the code. Something like:

C:\Python34>python C:\Users\pranayk\Desktop\hello.py 1 1

User · Answer

Here are all of the previous answers summarized    modules should be imported outside of functions  hello sys argv 2   needs to be indented since it is inside an if statement  hello has 2 arguments so you need to call 2 arguments  as far as calling the function from terminal  you need to call python  py        The code should look like this   import sys def hello a  b       print  hello and that s your sum       sum   a b     print sum  if   name        main         hello int sys argv 1    int sys argv 2      Then run the code with this command   python hello py 1 1

User · Answer

To execute your program from the command line  you have to call the python interpreter  like this    C  Python27 gt python hello py 1 1   If you code resides in another directory  you will have to set the python binary path in your PATH environment variable  to be able to run it  too  You can find detailed instructions here

User · Answer

import sys  def hello a  b       print   hello and that  s your sum   0   format a   b   if   name         main         hello int sys argv 1    int sys argv 2      Moreover see  thibauts answer about how to call python script

User · Answer

Your indentation is broken  This should fix it   import sys  def hello a b       print  hello and thats your sum       sum a b     print sum  if   name         main         hello sys argv 1   sys argv 2     Obviously  if you put the if   name   statement inside the function  it will only ever be evaluated if you run that function  The problem is  the point of said statement is to run the function in the first place

User · Answer

I found this thread looking for information about dealing with parameters  this easy guide was so cool   import argparse  parser   argparse ArgumentParser description  Script so useful    parser add argument  --opt1   type int  default 1  parser add argument  --opt2    args   parser parse args    opt1 value   args opt1 opt2 value   args opt2   run like   python myScript py --opt2    hi

User · Answer

import sys out of hello function  arguments should be converted to int  String literal that contain   should be escaped or should be surrouned by    Did you invoke the program with python hello py  lt some-number gt   lt some-number gt  in command line      import sys  def hello a b       print  hello and that s your sum    a   b  if   name         main         a   int sys argv 1       b   int sys argv 2       hello a  b

[python] How do I run Python script using arguments in windows command line

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