4. 注释和#号

print "hello world!"
print "hello again"
print "#I like typing this."    #本行的#在字符串内部，不代表注释
print "#This is fun."
#print 'Yay!Printing.'          #本行开始，下面的都被注释了
#print "I'd much rather you 'not'."
#print 'I "said" do not touch this.'

输出
hello world!
hello again
#I like typing this.
#This is fun.