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 get it to prompt me to enter a filename?
Use the input() function to get input from users:
print("Enter a file name:")
filename = input()
or just:
filename = input("Enter a file name: ")
In Python 2, the equivalent was raw_input().
try: input = raw_input ; except NameError: pass; And then use input freely. (Basically, if raw_input exists, assign it to the name input. If not, well, you're in python3). Semicolons are actually supposed to be newlinesIn python 3.x, use input() instead of raw_input()
input() is better than raw_input() since 3.x? Other than it being easier to type...
raw_input doesn't exist.
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]
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)
self?). I've upvoted, but it needs some work on the documentation.self wasn't supposed to be there so I removed it. I changed input for Python 2/3 compatibility. Check out the comments in the other answers.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)
