# Basic value comparison
from operator import *


# Main compare class
class Compare(object):
    def __init__(self):
        self.OpError = "OpError: Invalid operator or brace.n"
        self.IntError = "IntError: Invalid integers.n"
        self.StrError = "StrError: Invalid strings.n"
        self.LstError = "LstError: Invalid list.n"
        self.BoolError = "BoolError: Invalid boolean.n"
        self.st_brace = "["
        self.end_brace = "]"
        self.OPERATORS = {
            ">=": ge,
            "<=": le,
            "==": eq,
            "!=": ne,
            ">": gt,
            "<": lt}

    # Compare two integers
    def compareint(self, command):
        if command[1] == self.st_brace and command[3] in self.OPERATORS and command[5] == self.end_brace:
            try:
                print self.OPERATORS[command[3]](
                    int(command[2]), int(command[4]))
            except ValueError:
                print self.IntError
        if command[3] not in self.OPERATORS:
            print self.OpError

    # Compare two strings
    def comparestr(self, command):
        if command[1] == self.st_brace and command[3] in self.OPERATORS and command[5] == self.end_brace:
            try:
                print self.OPERATORS[command[3]](
                    eval(command[2]), eval(command[4]))
            except SyntaxError:
                print self.StrError
        if command[3] not in self.OPERATORS:
            print self.OpError

    # Compare two lists
    def comparelst(self, command):
        if command[1] == self.st_brace and command[3] in self.OPERATORS and command[5] == self.end_brace:
            try:
                print self.OPERATORS[command[3]](
                    eval(command[2]), eval(command[4]))
            except SyntaxError:
                print self.LstError
        if command[3] not in self.OPERATORS:
            print self.OpError

    # Compare two booleans
    def comparebool(self, command):
        if command[1] == self.st_brace and command[3] in self.OPERATORS and command[5] == self.end_brace:
            try:
                print self.OPERATORS[command[3]](
                    eval(command[2]), eval(command[4]))
            except NameError:
                print self.BoolError
        if command[3] not in self.OPERATORS:
            print self.OpError


# Dict containing commands
COMMANDS = {
    "cmpbool": Compare().comparebool,
    "cmplst": Compare().comparelst,
    "cmpint": Compare().compareint,
    "cmpstr": Compare().comparestr,
}


# Read the inputted commands
def read_command(prompt):
    command = raw_input(prompt)
    split_cmd = command.split(" ")
    if split_cmd[0] in COMMANDS:
        COMMANDS[split_cmd[0]](split_cmd)
    if split_cmd[0] not in COMMANDS:
        print "CmdError: Invalid command.n"


# Run the program
if __name__ == "__main__":
    while True: read_command(">}}>")

>}}>cmpbool [ True == True ]
True
>}}>cmplst [ [""] == [""] ]
True
>}}>cmpint [ 2 == 2 ]
True
>}}>cmpstr [ "Hello" == "Hello" ]
True