property of class JsNgramReader

Description

Set the json file directory to read.

Example 
self.src = '/scratch/a/pub/idx'
Default value 
'.'
Usage 
import jsngram.jsngram

# gives at class initializing
chk = jsngram.jsngram.JsNgramReader(src='/scratch/a/pub/idx')

# sets property value later
chk.src = '/scratch/b/pub/idx'