Full bayes classifier

I have been working on coding bayes classifier. I managed to bring out a working model of naive bayes classifier. Any suggestions on how to convert it to full bayes classifier? I have written down various functions for printing means, covariance matrix and probabilities.

The current model works well and I am able to train and predict various values from csv files. But I would need to convert this to full bayes for fitting my needs better.

import csv
import random
import math

import pandas as pd
df = pd.read_csv('iris.txt.shuffled', sep=',', header=None)
from sklearn.preprocessing import LabelEncoder

import numpy as np
means = df.groupby([4]).mean()[[0, 1, 2, 3]]
means.columns = ['Feature 1', 'Feature 2', 'Feature 3', 'Feature 4']
print('Means: \n', means, '\n')

le = LabelEncoder()
df[4] = le.fit_transform(df[4])
dataset = df.values.tolist()
print('Covariance matrix: \n', np.cov(df[[0, 1, 2, 3]].T), '\n')

def loadCsv(filename):
    df = pd.read_csv('iris.txt.shuffled', sep=',', header=None)
    print('Class probabilities: \n', df[4].value_counts()/df.shape[0], '\n')
    le = LabelEncoder()
    df[4] = le.fit_transform(df[4])
    dataset = df.values.tolist()
    return dataset


def splitDataset(dataset, splitRatio):
    trainSize = int(len(dataset) * splitRatio)
    trainSet = []
    copy = list(dataset)
    while len(trainSet) < trainSize:
        index = random.randrange(len(copy))
        trainSet.append(copy.pop(index))
    return [trainSet, copy]

def separateByClass(dataset):
    separated = {}
    for i in range(len(dataset)):
        vector = dataset[i]
        if (vector[-1] not in separated):
            separated[vector[-1]] = []
        separated[vector[-1]].append(vector)
    return separated

def mean(numbers):
    return sum(numbers)/float(len(numbers))

def stdev(numbers):
    avg = mean(numbers)
    variance = sum([pow(x-avg,2) for x in numbers])/float(len(numbers)-1)
    return math.sqrt(variance)

def summarize(dataset):
    summaries = [(mean(attribute), stdev(attribute)) for attribute in zip(*dataset)]
    del summaries[-1]
    return summaries

def summarizeByClass(dataset):
    separated = separateByClass(dataset)
    summaries = {}
    for classValue, instances in zip(separated.keys(), separated.values()):
        summaries[classValue] = summarize(instances)
    return summaries

def calculateProbability(x, mean, stdev):
    exponent = math.exp(-(math.pow(x-mean,2)/(2*math.pow(stdev,2))))
    return (1 / (math.sqrt(2*math.pi) * stdev)) * exponent

def calculateClassProbabilities(summaries, inputVector):
    probabilities = {}
    for classValue, classSummaries in zip(summaries.keys(), summaries.values()):
        probabilities[classValue] = 1
        for i in range(len(classSummaries)):
            mean, stdev = classSummaries[i]
            x = inputVector[i]
            probabilities[classValue] *= calculateProbability(x, mean, stdev)
    return probabilities

def predict(summaries, inputVector):
    probabilities = calculateClassProbabilities(summaries, inputVector)
    bestLabel, bestProb = None, -1
    for classValue, probability in zip(probabilities.keys(), probabilities.values()):
        if bestLabel is None or probability > bestProb:
            bestProb = probability
            bestLabel = classValue
    return bestLabel

def getPredictions(summaries, testSet):
    predictions = []
    for i in range(len(testSet)):
        result = predict(summaries, testSet[i])
        predictions.append(result)
    return predictions

def getAccuracy(testSet, predictions):
    correct = 0
    for i in range(len(testSet)):
        if testSet[i][-1] == predictions[i]:
            correct += 1
    return (correct/float(len(testSet))) * 100.0

def main():
    filename = 'iris'
    splitRatio = 0.80
    dataset = loadCsv(filename)
    trainingSet, testSet = splitDataset(dataset, splitRatio)
    print('Split {} rows into train={} and test={} rows'.format(len(dataset), len(trainingSet), len(testSet)))
    # prepare model
    summaries = summarizeByClass(trainingSet)
    # test model
    predictions = getPredictions(summaries, testSet)
    accuracy = getAccuracy(testSet, predictions)
    print('Accuracy: {}%'.format(accuracy))

main()