Author xiang.zhang
Recipients xiang.zhang
Date 2018-05-28.14:57:29
SpamBayes Score -1.0
Marked as misclassified Yes
Message-id <1527519449.91.0.682650639539.issue33669@psf.upfronthosting.co.za>
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Content
I'm somewhat surprised when I have code like `"hello %s".format(person)` in my project there is no exception raised and "hello %s" returned. Have several tries it seems `str.format` won't check argument number.

>>> '{} {}'.format(1)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IndexError: tuple index out of range
>>> '{} {}'.format(1, 2, 3)
'1 2'
>>> ''.format(1, 2, 3)
''
>>>

The IndexError is not ideal. I think this behavior could be improved since it's highly possible such code is an oversight bug. The old format string does a good job in this place:

>>> "%s %s" % 1
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: not enough arguments for format string
>>> "%s %s" % (1,2,3)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: not all arguments converted during string formatting
>>> "" % 1
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: not all arguments converted during string formatting
History
Date User Action Args
2018-05-28 14:57:29xiang.zhangsetrecipients: + xiang.zhang
2018-05-28 14:57:29xiang.zhangsetmessageid: <1527519449.91.0.682650639539.issue33669@psf.upfronthosting.co.za>
2018-05-28 14:57:29xiang.zhanglinkissue33669 messages
2018-05-28 14:57:29xiang.zhangcreate