Is there a Python equivalent to Ruby s string interpolation

Question

Ruby example   name    Spongebob Squarepants  puts  Who lives in a Pineapple under the sea   n  name      The successful Python string concatenation is seemingly verbose to me

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import inspect def s template    kwargs        Usage  s string    locals         if not kwargs          frame   inspect currentframe           try              kwargs   frame f back f locals         finally              del frame         if not kwargs              kwargs   globals       return template format   kwargs    Usage   a   123 s   a    locals      print  123  s   a      it is equal to the above statement  print  123  s   b      raise an KeyError  b variable not found   PS  performance may be a problem  This is useful for local scripts  not for production logs   Duplicated    Python string formatting    vs   format What is the Python equivalent of embedding an expression in a string   ie   quot   expr  quot  in Ruby  What is Ruby equivalent of Python  39 s  s   quot hello   s  Where is  s  quot      quot John quot   quot Mary quot    Is there a Python equivalent to Ruby  39 s string interpolation

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I ve developed the interpy package  that enables string interpolation in Python   Just install it via pip install interpy  And then  add the line   coding  interpy at the beginning of your files   Example      usr bin env python   coding  interpy  name    Spongebob Squarepants  print  Who lives in a Pineapple under the sea   n  name

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Since Python 2 6 X you might want to use    my  0  string   1   format  cool    Hello there

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String interpolation is going to be included with Python 3 6 as specified in PEP 498  You will be able to do this   name    Spongebob Squarepants  print f Who lives in a Pineapple under the sea   n name      Note that I hate Spongebob  so writing this was slightly painful

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You can also have this  name    Spongebob Squarepants  print  Who lives in a Pineapple under the sea   n name    format name name    http   docs python org 2 library string html formatstrings

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For old Python  tested on 2 4  the top solution points the way  You can do this   import string  def try interp        d   1     f   1 1     s    s      print string Template  d   d f   f s   s   substitute   locals     try interp     And you get  d  1 f  1 1 s  s

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Python 3 6 will add literal string interpolation similar to Ruby s string interpolation   Starting with that version of Python  which is scheduled to be released by the end of 2016   you will be able to include expressions in  f-strings   e g   name    Spongebob Squarepants  print f Who lives in a Pineapple under the sea   name       Prior to 3 6  the closest you can get to this is  name    Spongebob Squarepants  print  Who lives in a Pineapple under the sea    name s     locals      The   operator can be used for string interpolation in Python   The first operand is the string to be interpolated  the second can have different types including a  mapping   mapping field names to the values to be interpolated   Here I used the dictionary of local variables locals   to map the field name name to its value as a local variable   The same code using the  format   method of recent Python versions would look like this   name    Spongebob Squarepants  print  Who lives in a Pineapple under the sea   name s    format   locals       There is also the string Template class   tmpl   string Template  Who lives in a Pineapple under the sea   name    print tmpl substitute name  Spongebob Squarepants

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Python 3 6 and newer have literal string interpolation using f-strings   name  world  print f Hello  name

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Python s string interpolation is similar to C s printf     If you try   name    SpongeBob Squarepants  print  Who lives in a Pineapple under the sea   s    name   The tag  s will be replaced with the name variable  You should take a look to the print function tags  http   docs python org library functions html

[python] Is there a Python equivalent to Ruby's string interpolation?

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