python 高階學習之2

>>> print ("hello")    

hello

>>> mystring = 'aa'

>>> print(mystring)

aa下劃線(_)在直譯器中有特別的含義，表示最後乙個表示式的值

>>> a="22"

>>> _    

traceback (most recent call last):

file "", line 1, in

nameerror: name '_' is not defined

>>> a

'22'

>>> _

'22'

python 的print 語句，與字串格式運算子( % )結合使用，可實現字串替換功能

>>> print("%s is %d" % ("ss",0))

ss is 0

>>> logfile = open('1.txt', 'a') 

>>> print >> logfile, 'fatal error: invalid input!'

>>> logfile.close()

>>> user = raw_input('enter login name: ')

enter login name: daf

>>> print 'your login is:', user

your login is: daf

#

def foo():

"this is a doc string."

return true

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