ex1 to ex3.py

#_*_ coding: utf-8 _*_  #表示的是在脚本中使用unicode utf-8 编码
print ("hello world!")
print ("hello again")
print ("this is fun")
print ("yay! printing")
print ("i'd much rather you 'not'")
print ('i "said" do not touch this.')

"""# A comment,this is so you can read your program later
# anything after the # is ignored by python

print ("i could have code like this.") # and the commment after is ignored"""

# you can also use a comment to "disable" or comment out a piece od code:
#print "this won't run"

print ("this will run")
print ("hi # here")

# -*- coding: utf-8 -*- 
"""print ("i will now count chickens:")

print ("hens",25+30/6)
print ("roosters",100-25*3%4)

print ("now i will count the eggs:")

print (3+2+1-5+4%-1/4+6)

print ("is it true that 3+2<5-7?")

print (3 + 2  < 5 - 7)

print ("what is 3 + 2?", 3+2)

print ("what is 5 - 7?",5-7)

print ("oh,that's why it's false")

print ("how about some more.")

print ("is it great?", 5 > -2)
print ("is it greater or equal?" ,5 >= -2)
print ("IS it less or equal ?", 5 <= -2)"""