lower()|upper()|Traceback|title()|字符串合并|rstrip|lstrip|str()|

print ("hello,world!")
sentence = "yyyy"
print (sentence.lower())
print (sentence.upper())

#print (sentenc)

#hello,world!
#yyyy
#YYYY
#Traceback (most recent call last):
#      File "t.py", line 4, in <module>
#          print (sentenc)
#          NameError: name 'sentenc' is not defined

print ('his name is "Li"')

#his name is "Li"

first = "a    " 
first_1 ="a"
if first == first_1:
    print ("fit!") 
else: 
    print ("wrong!")

second = "b"
print "	ook"+first.rstrip() + "      " +second.title()+"!"

#wrong!
#        ooka          B!

p = (2+3)**3 
Q = 0.1 *3
print str(p)+""+str(Q)

#1250.3