#!/usr/bin/env python
#-*- coding: utf-8 -*-
# print 语法
print('hello world!')

# if 语法
if True:
    print('this is True')
else:
    print('this is False')

# 运算符
print(1 == 2)
print(1 != 2)

# and or not
print('(True and False) yields:',  True and False)
print('(True and True) yields:',  True and True)
print('(False and True) yields:',  False and True)
print('(True or False) yields:',  True or False)
print('(False or True) yields:',  False or True)
print('(False or False) yields:',  False or False)
print('(not True) yields:',  not True)
print('(not False) yields:',  not False)