Getting user input [duplicate]

This question already has answers here: How to read keyboard input? (5 answers) Closed 4 years ago.

I am running this:

import csv
import sys
reader = csv.reader(open(sys.argv[0], "rb"))
for row in reader:
    print row

And I get this in response:

['import csv']
['import sys']
['reader = csv.reader(open(sys.argv[0]', ' "rb"))']
['for row in reader:']
['    print row']
>>> 

For the sys.argv[0] I would like it to prompt me to enter a filename.

How do I g开发者_如何转开发et it to prompt me to enter a filename?

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Use the raw_input() function to get input from users (2.x):

print "Enter a file name:",
filename = raw_input()

or just:

filename = raw_input('Enter a file name: ')

or if in Python 3.x:

filename = input('Enter a file name: ')

---

In python 3.x, use input() instead of raw_input()

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sys.argv[0] is not the first argument but the filename of the python program you are currently executing. I think you want sys.argv[1]

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To supplement the above answers into something a little more re-usable, I've come up with this, which continues to prompt the user if the input is considered invalid.

try:
    input = raw_input
except NameError:
    pass

def prompt(message, errormessage, isvalid):
    """Prompt for input given a message and return that value after verifying the input.

    Keyword arguments:
    message -- the message to display when asking the user for the value
    errormessage -- the message to display when the value fails validation
    isvalid -- a function that returns True if the value given by the user is valid
    """
    res = None
    while res is None:
        res = input(str(message)+': ')
        if not isvalid(res):
            print str(errormessage)
            res = None
    return res

It can be used like this, with validation functions:

import re
import os.path

api_key = prompt(
        message = "Enter the API key to use for uploading", 
        errormessage= "A valid API key must be provided. This key can be found in your user profile",
        isvalid = lambda v : re.search(r"(([^-])+-){4}[^-]+", v))

filename = prompt(
        message = "Enter the path of the file to upload", 
        errormessage= "The file path you provided does not exist",
        isvalid = lambda v : os.path.isfile(v))

dataset_name = prompt(
        message = "Enter the name of the dataset you want to create", 
        errormessage= "The dataset must be named",
        isvalid = lambda v : len(v) > 0)

---

Use the following simple way to interactively get user data by a prompt as Arguments on what you want.

Version : Python 3.X

name = input('Enter Your Name: ')
print('Hello ', name)