python字符串格式化

Python 2.7.12rc1 (v2.7.12rc1:13912cd1e7e8, Jun 12 2016, 05:57:31) [MSC v.1500 64 bit (AMD64)] on win32
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>>> str1="i love fish"
>>> str1[:6]
'i love'
>>> str="111eee"
>>> str.isalnum()
True
>>> str6="i love cppc"
>>> str
'111eee'
>>> str6
'i love cppc'
>>> str6.splice()

Traceback (most recent call last):
  File "<pyshell#7>", line 1, in <module>
    str6.splice()
AttributeError: 'str' object has no attribute 'splice'
>>> str6.split()
['i', 'love', 'cppc']
>>> str6
'i love cppc'
>>> str6.title()
'I Love Cppc'
>>> "{a} love {b}.{c}".format(a='i',b='fish',c='com')
'i love fish.com'
>>> {0}.format("ni")

Traceback (most recent call last):
  File "<pyshell#12>", line 1, in <module>
    {0}.format("ni")
AttributeError: 'set' object has no attribute 'format'
>>> "{0}".format("ni")
'ni'
>>> {{0}}.format("ni")

Traceback (most recent call last):
  File "<pyshell#14>", line 1, in <module>
    {{0}}.format("ni")
TypeError: unhashable type: 'set'
>>>  "{{0}}".format("ni")
 
  File "<pyshell#15>", line 2
    "{{0}}".format("ni")
    ^
IndentationError: unexpected indent
>>> "{}".format("ni")
'ni'
>>> "{{0}}".format("ni")
'{0}'
>>> "{0:.1lf}{1}".format(27.546,GB)

Traceback (most recent call last):
  File "<pyshell#18>", line 1, in <module>
    "{0:.1lf}{1}".format(27.546,GB)
NameError: name 'GB' is not defined
>>> "{0:.1lf}{1}".format('27.546','GB')

Traceback (most recent call last):
  File "<pyshell#19>", line 1, in <module>
    "{0:.1lf}{1}".format('27.546','GB')
ValueError: Invalid conversion specification
>>> "{0:.1lf}{1}".format(27.546,'GB')

Traceback (most recent call last):
  File "<pyshell#20>", line 1, in <module>
    "{0:.1lf}{1}".format(27.546,'GB')
ValueError: Invalid conversion specification
>>> "{0:.1f}{1}".format('27.546','GB')

Traceback (most recent call last):
  File "<pyshell#21>", line 1, in <module>
    "{0:.1f}{1}".format('27.546','GB')
ValueError: Unknown format code 'f' for object of type 'str'
>>> '{0:.1lf}{1}'.format(27.546,'GB')

Traceback (most recent call last):
  File "<pyshell#22>", line 1, in <module>
    '{0:.1lf}{1}'.format(27.546,'GB')
ValueError: Invalid conversion specification
>>> "{0:.lf}{1}".format(27.546,'GB')

Traceback (most recent call last):
  File "<pyshell#23>", line 1, in <module>
    "{0:.lf}{1}".format(27.546,'GB')
ValueError: Format specifier missing precision
>>> "{0:.1f}{1}".format(27.546,'GB')
'27.5GB'
>>> '%c %c %c' % (97,97,99)
'a a c'
>>> '%e'  %  27.3342
'2.733420e+01'
>>>