Updated README and removed args from commandline

README

@@ -1,2 +1,13 @@
 USAGE:
-$> python convert_tide.py source_file.txt new_file.txt
+$ python convert_tide.py
+Tide Format Converter
+CTRL + C to exit
+Enter the location of file you want to convert: non-existen-file.txt
+'non-existen-file.txt' not found.
+Please enter again the filename you want to convert: waterlevel.txt
+Enter the filename of the output file: converted_waterlevel.txt
+Creating file converted_waterlevel.txt .....
+-------------------------------------------------------------
+Time zone is GMT + 1 hour in the Winter Time
+and GMT + 2 hours in the Summer Time (daylight saving time).
+Press enter to exit

convert_tide.py

@@ -1,26 +1,30 @@
 from sys import argv
 import os
 
-script, input_file, output_file = argv
 """
 input_file:         your tide input file
 output_file:        the name of the output file
 """
 print "Tide Format Converter"
 print "CTRL + C to exit"
 
-#input_file = raw_input("Enter the location of file you want to convert: ")
-#output_file = raw_input("Enter the filename of the output file: ")
+input_file = raw_input("Enter the location of file you want to convert: ")
+
+while not os.path.exists(input_file):
+    print "'%s' not found." % input_file
+    input_file = raw_input("Please enter again the filename you want to convert: ")
+
+if os.path.exists(input_file):
+    output_file = raw_input("Enter the filename of the output file: ")
 
 start_line = 8 #you can edit this
 
 i = 0;
 error = False
-cwd = os.getcwd()
 try:
     new_file = open(output_file, 'w')
     new_file.truncate()
-    print "Creating file:", output_file, 
+    print "Creating file %s ....." % output_file
 
     for line in open(input_file, 'r'):  
         if i >= start_line: #start reading at specified linen number
@@ -47,12 +51,7 @@
     print "Time zone is GMT + 1 hour in the Winter Time"
     print "and GMT + 2 hours in the Summer Time (daylight saving time)."
 
-except IOError as (errno, strerror):
-    print "I/O error({0}): {1}".format(errno, strerror)
-except ValueError:
-    print "Could not convert data to an integer."
 except:
-    print "Unexpected error:", sys.exc_info()[0]
-    raise
+    print "Unexpected error"
 
 raw_input("Press enter to exit")