Using multiple arguments for string formatting in Python e g s s

Question

I have a string that looks like   s in  s  and I want to know how to seperate the arguments so that they are two different  s  My mind coming from Java came up with this      s in  s    unicode self author    unicode self publication    But this doesn t work so how does it look in Python

User · Answer

You must just put the values into parentheses:

'%s in %s' % (unicode(self.author),  unicode(self.publication))

Here, for the first %s the unicode(self.author) will be placed. And for the second %s, the unicode(self.publication) will be used.

Note: You should favor string formatting over the % Notation. More info here

User · Answer

You could also use it clean and simple  but wrong  because you should use format like Mark Byers said  by doing   print  This is my  s formatted with  d arguments      string   2

User · Answer

If you re using more than one argument it has to be in a tuple  note the extra parentheses      s in  s     unicode self author    unicode self publication     As EOL points out  the unicode   function usually assumes ascii encoding as a default  so if you have non-ASCII characters  it s safer to explicitly pass the encoding     s in  s     unicode self author  utf-8     unicode self publication  utf-8       And as of Python 3 0  it s preferred to use the str format   syntax instead     0  in  1   format unicode self author  utf-8   unicode self publication  utf-8

User · Answer

For completeness  in python 3 6 f-string are introduced in PEP-498  These strings make it possible to     embed expressions inside string literals  using a minimal syntax    That would mean that for your example you could also use   f  self author  in  self publication

User · Answer

Mark Cidade s answer is right - you need to supply a tuple   However from Python 2 6 onwards you can use format instead of       0  in  1   format unicode self author  utf-8     unicode self publication  utf-8      Usage of   for formatting strings is no longer encouraged      This method of string formatting is the new standard in Python 3 0  and should be preferred to the   formatting described in String Formatting Operations in new code

User · Answer

There is a significant problem with some of the answers posted so far  unicode   decodes from the default encoding  which is often ASCII  in fact  unicode   tries to make  sense  of the bytes it is given by converting them into characters   Thus  the following code  which is essentially what is recommended by previous answers  fails on my machine     - - coding  utf-8 - - author      ric  print   0   format unicode author     gives   Traceback  most recent call last     File  test py   line 3  in  lt module gt      print   0   format unicode author   UnicodeDecodeError   ascii  codec can t decode byte 0xc3 in position 0  ordinal not in range 128    The failure comes from the fact that author does not contain only ASCII bytes  i e  with values in  0  127    and unicode   decodes from ASCII by default  on many machines    A robust solution is to explicitly give the encoding used in your fields  taking UTF-8 as an example   u  0  in  1   format unicode self author   utf-8    unicode self publication   utf-8       or without the initial u  depending on whether you want a Unicode result or a byte string    At this point  one might want to consider having the author and publication fields be Unicode strings  instead of decoding them during formatting

User · Answer

On a tuple mapping object for multiple argument format The following is excerpt from the documentation   Given format   values    conversion specifications in format are replaced with zero or more elements of values  The effect is similar to the using sprintf   in the C language  If format requires a single argument  values may be a single non-tuple object  Otherwise  values must be a tuple with exactly the number of items specified by the format string  or a single mapping object  for example  a dictionary    References  docs python org library stdtypes - string formatting   On str format instead of   A newer alternative to   operator is to use str format  Here s an excerpt from the documentation   str format  args    kwargs  Perform a string formatting operation  The string on which this method is called can contain literal text or replacement fields delimited by braces     Each replacement field contains either the numeric index of a positional argument  or the name of a keyword argument  Returns a copy of the string where each replacement field is replaced with the string value of the corresponding argument  This method is the new standard in Python 3 0  and should be preferred to   formatting   References  docs python org library stdtypes - str format - syntax   Examples Here are some usage examples   gt  gt  gt    s for  s      quot tit quot    quot tat quot   tit for tat   gt  gt  gt      and     format  quot chicken quot    quot waffles quot   chicken and waffles   gt  gt  gt     last s    first s   last s      first    quot James quot    last    quot Bond quot   Bond  James Bond   gt  gt  gt    last    first   last   format first  quot James quot   last  quot Bond quot   Bond  James Bond  See also  docs python org library string - format examples

User · Answer

For python2 you can also do this     author s in   publication s    author  unicode self author                                      publication  unicode self publication     which is handy if you have a lot of arguments to substitute  particularly if you are doing internationalisation   Python2 6 onwards supports  format      author  in  publication   format author self author                                     publication self publication

[python] Using multiple arguments for string formatting in Python (e.g., '%s ... %s')

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