python3 slice

Python 3.4.3 (v3.4.3:9b73f1c3e601, Feb 24 2015, 22:43:06) [MSC v.1600 32 bit (Intel)] on win32
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>>> 'spam eggs'
'spam eggs'
>>> 'doesn\'t' #单引号转义
"doesn't"
>>> '"yes",he said .'
'"yes",he said .'
>>> "\"yes,\" he said"
'"yes," he said'
>>> '"Isn\'t," she said'
'"Isn\'t," she said'
>>> print('"Isn\'t," she said')
"Isn't," she said
>>> s = 'First line.\n Second line' #"\n" 意味着新的一行
>>> s
'First line.\n Second line'
>>> print(s)
First line.
Second line
>>> print('c:\some\name') #here \n means newline
c:\some
ame
>>> print(r'c:\some\name')
c:\some\name
>>> print("""\
    Usage: thingy [OPTIONS]
           -h               Display this usage message
           -H   hostname    Hostname to connect to
           """)
    Usage: thingy [OPTIONS]
           -h               Display this usage message
           -H   hostname    Hostname to connect to
>>> # 3 times 'un' ,followed by 'ium'
>>> 3*'un' + 'ium'
'unununium'
>>> 'Py' 'thon'
'Python'
>>> text =('put several strings within parentheses'
           'to have them joined together')
>>> text
'put several strings within parenthesesto have them joined together'
>>> word = 'Python3'
>>> word[0]
'P'
>>> word[5]
'n'
>>> word[-1]
'3'
>>> word = 'Python'
>>> word[0]
'P'
.
>>> word[5]
'n'
>>> word[0:2]
'Py'
>>> word[2:5]
'tho'
>>> word[:2]+word[2:]
'Python'
>>> word[:4]+word[4:]
'Python'
>>> word[-2:]
'on'
>>>