#coding=utf-8

print 'hello world!!!'
print 'i want to ', 'quit the job'
# name = raw_input('please enter your name')
# print name


# this is comment
# 其他每一行都是一个语句，当语句以冒号:结尾时，缩进的语句视为代码块
# python大小写敏感
a = 100
if a >= 0:
    print a
else:
    print -a

print "\n"
print "i am a boy \t \\ \n \r"
print "i am bbb\r aaa"
print r"nihao a a\\\\\n\r\r\r"
print '''line1
line2
line3'''
print not (1>2 and 3>4)
PI = 3.1415926
print PI