ValueError unsupported format character while forming strings

Question

This works   print  Hello World s         But this doesn t  print  Hello 20World s         the error is ValueError  unsupported format character  W   0x57  at index 8  I am using Python 2 7   Why would I do this  Well  20 is used in place of spaces in urls  and if use it  I can t form strings with the printf formats  But why does Python do this

User · Answer

For anyone checking this using python 3  If you want to print the following output  quot 100  correct quot   python 3 8  print  quot 100  correct quot   python 3 7 and less  print  quot 100   correct quot    A neat programming workaround for compatibility across diff versions of python is shown below   Note  If you have to use this  you re probably experiencing many other errors    I d encourage you to upgrade   downgrade python in relevant machines so that they are all compatible  DevOps is a notable exception to the above -- implementing the following code would indeed be appropriate for specific DevOps   Debugging scenarios   import sys  if version info major  3      if version info minor gt  8          my string    quot 100  correct quot      else          my string    quot 100   correct quot     Finally print my string

User · Answer

You might have a typo   In my case I was saying  w where I meant to say  s

User · Answer

You could escape the   in  20 like so   print  Hello  20World s         or you could try using the string formatting routines instead  like   print  Hello 20World 0   format        http   docs python org library string html formatstrings

User · Answer

Well  why do you have  20 url-quoting escapes in a formatting string in first place  Ideally you d do the interpolation formatting first   formatting template    Hello World s  text       full string   formatting template   text   Then you url quote it afterwards   result   urllib quote full string    That is better because it would quote all url-quotable things in your string  including stuff that is in the text part

User · Answer

You could escape the   with another   so   20  This is a similar relevant question Python string formatting when string contains  quot  s quot  without escaping

User · Answer

I was using python interpolation and forgot the ending s character   a   dict foo  bar   print  What comes after foo    foo     a    Should be   foo s   Watch those typos

[python] ValueError: unsupported format character while forming strings

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