How to prompt for user input and read command-line arguments [closed]
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?
Asked by: Roman224 | Posted: 27-01-2022
Answer 1
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: optparseargparse 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.
Answered by: Aida924 | Posted: 28-02-2022Answer 2
var = raw_input("Please enter something: ")
print "you entered", var
Or for Python 3:
var = input("Please enter something: ")
print("You entered: " + var)
Answer 3
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)
Answer 4
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.
Answer 5
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
Answer 6
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>python -i emp.py 5
25
['emp.py', '5']
5
2) Passing invalid argument other than number
C:\Users\bgh37516\Desktop>python -i emp.py five
usage: emp.py [-h] square
emp.py: error: argument square: invalid int value: 'five'
<type 'exceptions.SystemExit'>
Answer 7
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
Answered by: Abigail288 | Posted: 28-02-2022Answer 8
If you are running Python <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)
Answer 9
As of Python 3.2 2.7, there is now argparse for processing command line arguments.
Answer 10
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
Answer 11
In Python 2:
data = raw_input('Enter something: ')
print data
In Python 3:
data = input('Enter something: ')
print(data)
Answer 12
import six
if six.PY2:
input = raw_input
print(input("What's your name? "))
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