How to prompt for user input and read command-line arguments

Question

How do I have a Python script that a  can accept user input and how do I make it b  read in arguments if run from the command line

User · Answer

The best way to process command line arguments is the argparse module   Use raw input   to get user input   If you import the readline module your users will have line editing and history

User · Answer

Careful not to use the input function  unless you know what you re doing  Unlike raw input  input will accept any python expression  so it s kinda like eval

User · Answer

The best way to process command line arguments is the argparse module   Use raw input   to get user input   If you import the readline module your users will have line editing and history

User · Answer

import six  if six PY2      input   raw input  print input  What s your name

User · Answer

If it s a 3 x version then just simply use   variantname   input     For example  you want to input 8   x   input   8   x will equal 8 but it s going to be a string except if you define it otherwise   So you can use the convert command  like   a   int x    1 1343 print round a  2      9 07  9 07

User · Answer

raw input is no longer available in Python 3 x   But raw input was renamed input  so the same functionality exists   input var   input  Enter something     print   you entered     input var     Documentation of the change

User · Answer

Use  raw input  for input from a console terminal   if you just want a command line argument like a file name or something e g      python my prog py file name txt   then you can use sys argv     import sys print sys argv   sys argv is a list where 0 is the program name  so in the above example sys argv 1  would be  file name txt   If you want to have full on command line options use the optparse module   Pev

User · Answer

If you are running Python  lt 2 7  you need optparse  which as the doc explains will create an interface to the command line arguments that are called when your application is run   However  in Python  2 7  optparse has been deprecated  and was replaced with the argparse as shown above  A quick example from the docs        The following code is a Python program that takes a list of integers   and produces either the sum or the max    import argparse  parser   argparse ArgumentParser description  Process some integers    parser add argument  integers   metavar  N   type int  nargs                         help  an integer for the accumulator   parser add argument  --sum   dest  accumulate   action  store const                      const sum  default max                     help  sum the integers  default  find the max     args   parser parse args   print args accumulate args integers

User · Answer

import six  if six PY2      input   raw input  print input  What s your name

User · Answer

Careful not to use the input function  unless you know what you re doing  Unlike raw input  input will accept any python expression  so it s kinda like eval

User · Answer

In Python 2   data   raw input  Enter something     print data   In Python 3   data   input  Enter something     print data

User · Answer

var   raw input  Please enter something     print  you entered   var   Or for Python 3   var   input  Please enter something     print  You entered      var

User · Answer

Careful not to use the input function  unless you know what you re doing  Unlike raw input  input will accept any python expression  so it s kinda like eval

User · Answer

To read user input you can try the cmd module for easily creating a mini-command line interpreter  with help texts and autocompletion  and raw input  input for Python 3   for reading a line of text from the user   text   raw input  prompt      Python 2 text   input  prompt      Python 3   Command line inputs are in sys argv  Try this in your script   import sys print  sys argv    There are two modules for parsing command line options  optparse  deprecated since Python 2 7  use argparse instead  and getopt  If you just want to input files to your script  behold the power of fileinput   The Python library reference is your friend

User · Answer

If it s a 3 x version then just simply use   variantname   input     For example  you want to input 8   x   input   8   x will equal 8 but it s going to be a string except if you define it otherwise   So you can use the convert command  like   a   int x    1 1343 print round a  2      9 07  9 07

User · Answer

Careful not to use the input function  unless you know what you re doing  Unlike raw input  input will accept any python expression  so it s kinda like eval

User · Answer

var   raw input  Please enter something     print  you entered   var   Or for Python 3   var   input  Please enter something     print  You entered      var

User · Answer

Use  raw input  for input from a console terminal   if you just want a command line argument like a file name or something e g      python my prog py file name txt   then you can use sys argv     import sys print sys argv   sys argv is a list where 0 is the program name  so in the above example sys argv 1  would be  file name txt   If you want to have full on command line options use the optparse module   Pev

User · Answer

Use  raw input  for input from a console terminal   if you just want a command line argument like a file name or something e g      python my prog py file name txt   then you can use sys argv     import sys print sys argv   sys argv is a list where 0 is the program name  so in the above example sys argv 1  would be  file name txt   If you want to have full on command line options use the optparse module   Pev

User · Answer

The best way to process command line arguments is the argparse module   Use raw input   to get user input   If you import the readline module your users will have line editing and history

User · Answer

raw input is no longer available in Python 3 x   But raw input was renamed input  so the same functionality exists   input var   input  Enter something     print   you entered     input var     Documentation of the change

User · Answer

In Python 2   data   raw input  Enter something     print data   In Python 3   data   input  Enter something     print data

User · Answer

This simple program helps you in understanding how to feed the user input from command line and to show help on passing invalid argument   import argparse import sys  try       parser   argparse ArgumentParser        parser add argument  square   help  display a square of a given number                   type int      args   parser parse args         print the square of user input from cmd line      print args square  2       print all the sys argument passed from cmd line including the program name      print sys argv       print the second argument passed from cmd line  Note it starts from ZERO     print sys argv 1  except      e   sys exc info   0      print e   1  To find the square root of 5  C  Users Desktop gt python -i emp py 5 25   emp py    5   5   2  Passing invalid argument other than number  C  Users bgh37516 Desktop gt python -i emp py five usage  emp py  -h  square emp py  error  argument square  invalid int value   five   lt type  exceptions SystemExit  gt

User · Answer

As of Python 3 2 2 7  there is now argparse for processing command line arguments

User · Answer

To read user input you can try the cmd module for easily creating a mini-command line interpreter  with help texts and autocompletion  and raw input  input for Python 3   for reading a line of text from the user   text   raw input  prompt      Python 2 text   input  prompt      Python 3   Command line inputs are in sys argv  Try this in your script   import sys print  sys argv    There are two modules for parsing command line options  optparse  deprecated since Python 2 7  use argparse instead  and getopt  If you just want to input files to your script  behold the power of fileinput   The Python library reference is your friend

User · Answer

Use  raw input  for input from a console terminal   if you just want a command line argument like a file name or something e g      python my prog py file name txt   then you can use sys argv     import sys print sys argv   sys argv is a list where 0 is the program name  so in the above example sys argv 1  would be  file name txt   If you want to have full on command line options use the optparse module   Pev

User · Answer

var   raw input  Please enter something     print  you entered   var   Or for Python 3   var   input  Please enter something     print  You entered      var

User · Answer

To read user input you can try the cmd module for easily creating a mini-command line interpreter  with help texts and autocompletion  and raw input  input for Python 3   for reading a line of text from the user   text   raw input  prompt      Python 2 text   input  prompt      Python 3   Command line inputs are in sys argv  Try this in your script   import sys print  sys argv    There are two modules for parsing command line options  optparse  deprecated since Python 2 7  use argparse instead  and getopt  If you just want to input files to your script  behold the power of fileinput   The Python library reference is your friend

User · Answer

var   raw input  Please enter something     print  you entered   var   Or for Python 3   var   input  Please enter something     print  You entered      var

User · Answer

This simple program helps you in understanding how to feed the user input from command line and to show help on passing invalid argument   import argparse import sys  try       parser   argparse ArgumentParser        parser add argument  square   help  display a square of a given number                   type int      args   parser parse args         print the square of user input from cmd line      print args square  2       print all the sys argument passed from cmd line including the program name      print sys argv       print the second argument passed from cmd line  Note it starts from ZERO     print sys argv 1  except      e   sys exc info   0      print e   1  To find the square root of 5  C  Users Desktop gt python -i emp py 5 25   emp py    5   5   2  Passing invalid argument other than number  C  Users bgh37516 Desktop gt python -i emp py five usage  emp py  -h  square emp py  error  argument square  invalid int value   five   lt type  exceptions SystemExit  gt

User · Answer

To read user input you can try the cmd module for easily creating a mini-command line interpreter  with help texts and autocompletion  and raw input  input for Python 3   for reading a line of text from the user   text   raw input  prompt      Python 2 text   input  prompt      Python 3   Command line inputs are in sys argv  Try this in your script   import sys print  sys argv    There are two modules for parsing command line options  optparse  deprecated since Python 2 7  use argparse instead  and getopt  If you just want to input files to your script  behold the power of fileinput   The Python library reference is your friend

User · Answer

If you are running Python  lt 2 7  you need optparse  which as the doc explains will create an interface to the command line arguments that are called when your application is run   However  in Python  2 7  optparse has been deprecated  and was replaced with the argparse as shown above  A quick example from the docs        The following code is a Python program that takes a list of integers   and produces either the sum or the max    import argparse  parser   argparse ArgumentParser description  Process some integers    parser add argument  integers   metavar  N   type int  nargs                         help  an integer for the accumulator   parser add argument  --sum   dest  accumulate   action  store const                      const sum  default max                     help  sum the integers  default  find the max     args   parser parse args   print args accumulate args integers

User · Answer

The best way to process command line arguments is the argparse module   Use raw input   to get user input   If you import the readline module your users will have line editing and history

User · Answer

As of Python 3 2 2 7  there is now argparse for processing command line arguments

[python] How to prompt for user input and read command-line arguments

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