How to put multiple statements in one line

Question

I wasn t sure under what title to ponder this question exactly  coding golf seems appropriate if a bit unspecific  I know a little bit of comprehensions in python but they seem very hard to  read   The way I see it  a comprehension might accomplish the same as the following code  for i in range 10   if i    9  print  i equals 9    This code is much easier to read than how comprehensions currently work but I ve noticed you cant have two   in one line     this brings me too    my question  Is there any way I can get the following example into ONE LINE  try      if sam 0      harry           print  hello    sam  except      pass  Something like this would be great  try  if sam 0      harry   print  hellp    sam  except pass  But again I encounter the conflicting   I d also love to know if there s a way to run try  or something like it  without except  it seems entirely pointless that I need to put except pass in there  its a wasted line

User · Answer

Its acctualy possible  -     not pep8 compatible  sam     Sam    try  print  hello  sam  if sam 0      harry  else rais except  pass   You can do very ugly stuff in python like   def o s  return   join  chr ord n   13if Z  lt n lt  n or N  gt n else-13  if n isalpha  else n for n in s     which is function for rot13 cesa encryption in one line with 99 characters

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Yes this post is 8 years old  but incase someone comes on here also looking for an answer  you can now just use semicolons  However  you cannot use if elif else staments  for while loops  and you can t define functions  The main use of this would be when using imported modules where you don t have to define any functions or use any if elif else for while statements loops   Here s an example that takes the artist of a song  the song name  and searches genius for the lyrics   import bs4  requests  song   input  Input artist then song name n    print bs4 BeautifulSoup requests get f https   genius com  song replace       -   -lyrics   text  html parser   select   lyrics   0  text strip

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Unfortunately  what you want is not possible with Python  which makes Python close to useless for command-line one-liner programs   Even explicit use of parentheses does not avoid the syntax exception  You can get away with a sequence of simple statements  separated by semi-colon   for i in range 10   print  foo   print  bar    But as soon as you add a construct that introduces an indented block  like if   you need the line break  Also   for i in range 10   print  i equals 9  if i  9 else None   is legal and might approximate what you want   As for the try     except thing  It would be totally useless without the except  try says  I want to run this code  but it might throw an exception   If you don t care about the exception  leave away the try  But as soon as you put it in  you re saying  I want to handle a potential exception   The pass then says you wish to not handle it specifically  But that means your code will continue running  which it wouldn t otherwise

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You could use the built-in exec statement  eg     exec  try   n  t if sam 0      harry    n  t t print  hello    sam   nexcept  pass     Where  n is a newline and  t is used as indentation  a tab   Also  you should count the spaces you use  so your indentation matches exactly   However  as all the other answers already said  this is of course only to be used when you really have to put it on one line   exec is quite a dangerous statement  especially when building a webapp  since it allows execution of arbitrary Python code

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I know I am late  but stumped into the question  and based on ThomasH s answer  for i in range 4   print  quot i equals 3 quot  if i  3 else None  output  None None None i equals 3 I propose to update as  for i in range 4   print  quot i equals 3 quot   if i  3 else print     end      output  i equals 3 Note  I am in python3 and had to use two print commands  pass after else won t work  Wanted to just comment on ThomasH s answer  but can t because I don t have enough reputation yet

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maybe with   and  or  or   after false need to write  or   after true need to write  and   like   n 0 def returnsfalse        global n     n n 1     print   false  d     n       return False def returnstrue        global n     n n 1     print   true  d     n       return True n 0 returnsfalse   or  returnsfalse   or returnsfalse   or returnstrue   and returnsfalse     result   false 1 false 2 false 3 true 4 false 5   or maybe like    returnsfalse   or true  and  returnstrue   or true  and         got here by searching google  how to put multiple statments in one line python    not answers question directly  maybe somebody else needs this

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For a python -c oriented solution  and provided you use Bash shell  yes you can have a simple one-line syntax like in this example   Suppose you would like to do something like this  very similar to your sample  including except  pass instruction    python -c   from   future   import print function ntry  import numpy  print  numpy get include    end   n    nexcept pass n  OUTPUT VARIABLE   numpy path   This will NOT work and produce this Error     File   lt string gt    line 1     from   future   import print function ntry  import numpy  print  numpy get include    end   n    nexcept pass n                                                                                                                     SyntaxError  unexpected character after line continuation character     This is because the competition between Bash and Python Interpretation of  n escape sequences  To solve the problem one can use the   string  Bash syntax to force  n Bash interpretation BEFORE the Python one  To make the example more challenging I added a typical Python end    n   specification in the Python print call  at the end you will be able to get BOTH  n interpretations from bash and Python working together  each on its piece of text of concern  So that finally the proper solution is like this    python -c    from   future   import print function ntry  n import numpy  n print  numpy get include    end    n    n print   Hello    nexcept pass n  OUTPUT VARIABLE   numpy path   That leads to the proper clean output with no error    Softs anaconda lib python3 7 site-packages numpy core include Hello   Note  this should work as well with exec oriented solutions  because the problem is still the same  Bash and Python interpreters competition    Note2  one could workaround the problem by replacing some  n by some   but it will not work anytime  depending on Python constructs   while my solution allows to always  one-line  any piece of classic multi-line Python program   Note3  of course  when one-lining  one has always to take care of Python spaces and indentation  because in fact we are not strictly  one-lining  here  BUT doing a proper mixed-management of  n escape sequence between bash and Python  This is how we can deal with any piece of classic multi-line Python program  The solution sample illustrates this as well

User · Answer

I do not incentivise this  but say you re on command line  you have nothing but Python and you really need a one-liner  you can do this    python -c    echo -e  a  True  nif a   print 1      What we re doing here is pre-processing  n before evaluating Python code     That s super hacky  Don t write code like this

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I recommend not doing this     What you are describing is not a comprehension    PEP 8 Style Guide for Python Code  which I do recommend  has this to say on compound statements         Compound statements  multiple statements on the same line  are generally discouraged          Yes         if foo     blah             do blah thing         do one         do two         do three         Rather not         if foo     blah   do blah thing         do one    do two    do three      Here is a sample comprehension to make the distinction    gt  gt  gt   i for i in xrange 10  if i    9   9

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Here is an example  for i in range 80  90   print i  end  quot   quot   if  i  89  else print i   Output  80 81 82 83 84 85 86 87 88 89  gt  gt  gt

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if you want it without try and except then there is the solution what you are trying to do is print  hello  if  harry  in a list then the solution is  hello  if  harry  in sam else

User · Answer

You are mixing a lot of things  which makes it hard to answer your question  The short answer is  As far as I know  what you want to do is just not possible in Python - for good reason   The longer answer is that you should make yourself more comfortable with Python  if you want to develop in Python  Comprehensions are not hard to read  You might not be used to reading them  but you have to get used to it if you want to be a Python developer  If there is a language that fits your needs better  choose that one  If you choose Python  be prepared to solve problems in a pythonic way  Of course you are free to fight against Python  But it will not be fun   -   And if you would tell us what your real problem is  you might even get a pythonic answer   Getting something in one line  us usually not a programming problem

[python] How to put multiple statements in one line?

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