''':多行字符,内可'和"
'*'的时候,在第二个'''前没有空格会EOL。
print '''''''',啥都不输出
print '''""''' 输出 ""
>>> print ''' ' a' '''
' a'
>>> print ''''''''
>>> print '''a'''''
a
>>> print ''' ' ' '''
' '
>>> print '''' ''''
SyntaxError: EOL while scanning string literal
>>> print '''' ''''
SyntaxError: EOL while scanning string literal
>>> print ''''''''
>>> print ''''' '''
''
>>> print ''''''
>>> print ''' '''
>>> print ''' '''''
>>> print ''''''''
>>> print ''' '''''
>>> print '''' ''''
SyntaxError: EOL while scanning string literal
>>> print '''atirng '''''
atirng
>>> print '''' ''''
SyntaxError: EOL while scanning string literal
>>> print ''' ' ' '''
' '
>>> print ''' ' ''''
SyntaxError: EOL while scanning string literal
>>> print '''a' ''''
SyntaxError: EOL while scanning string literal
>>>
' a'
>>> print ''''''''
>>> print '''a'''''
a
>>> print ''' ' ' '''
' '
>>> print '''' ''''
SyntaxError: EOL while scanning string literal
>>> print '''' ''''
SyntaxError: EOL while scanning string literal
>>> print ''''''''
>>> print ''''' '''
''
>>> print ''''''
>>> print ''' '''
>>> print ''' '''''
>>> print ''''''''
>>> print ''' '''''
>>> print '''' ''''
SyntaxError: EOL while scanning string literal
>>> print '''atirng '''''
atirng
>>> print '''' ''''
SyntaxError: EOL while scanning string literal
>>> print ''' ' ' '''
' '
>>> print ''' ' ''''
SyntaxError: EOL while scanning string literal
>>> print '''a' ''''
SyntaxError: EOL while scanning string literal
>>>
>>> print '''""'''
""
>>> print ''''''''
""
>>> print ''''''''