import numpy as np;
import matplotlib.pyplot as plot

lexiconSentiment = np.genfromtxt("list_of_lexicon_value.csv", delimiter = ',', dtype = [('f0', 'S24'), ('f1', '<f8')])

userInput = input("Enter the file-name: ")

textFileIntoArray = np.genfromtxt(userInput, delimiter = ' ', dtype = 'str')

booleanValues = np.in1d(lexiconSentiment['f0'], textFileIntoArray)

listOfSentimentNumberValue = []

the size of booleanValue
for x in range(0,booleanValues.size):
    if booleanValues[x]:
        listOfSentimentNumberValue.append(lexiconSentiment['f1'][x])
        print lexiconSentiment['f0'][x]

xLabelDescription = ["Negative", "Weakly Negative", "Neutral", "Weakly Positive", "Positive"]

plot.xlabel("Sentiment"); plot.ylabel("Percent of Words")

plot.hist(listOfSentimentNumberValue, bins = (-1.0,-0.5,0.0,0.5,1.0,1.5),  color = 'blue', range = (0.0, 0.0), normed = True)

label_pos = [-0.75,-0.25,0.25,0.75,1.25]

plot.xticks(label_pos, xLabelDescription)