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# Python 2.7

# prompt user for file of specific type(s).

# 11/01/13 sebastian raschka

import os.path

def get_filename(file_type):

'''repeatedly prompts user for a file of specific type.

arguments:

file_type: list with accepted file types as strings.

returns:

(string): absolute path to the specified input file.

'''

while True:

print "\n\nplease enter a file name, \nor type --help to get"\

" a list of the accepted file formats"

file_name = raw_input(": ")

if file_name == "--help":

print "\naccepted file format(s): ",

for f in file_type:

print f,

continue

if not os.path.isfile(file_name):

print "\n\nsorry, this file doesn't exist. please try again.\n"

continue

if not (file_name.split(".")[-1] in file_type):

print "\nplease provide a file in correct format."

continue

break

return os.path.abspath(file_name)

#get_filename(["txt", "doc"])

# ===========================

# EXAMPLE

# ===========================

'''

[bash]~/Desktop >python get_filename.py

please enter a file name,

or type --help to get a list of the accepted file formats

: --help

accepted file format(s): txt doc

please enter a file name,

or type --help to get a list of the accepted file formats

: test.tx

sorry, this file doesn't exist. please try again.

please enter a file name,

or type --help to get a list of the accepted file formats

: test.txt

[bash]~/Desktop >

'''