Python Assign print output to a variable

Question

I would like to know how to assign the output of the print function  or any function  to a variable  To give an example   import eyeD3 tag   eyeD3 Tag   tag link   some file mp3   print tag getArtist     How do I assign the output of print tag getArtist to a variable

User · Answer

To answer the question more generaly how to redirect standard output to a variable    do the following     from io import StringIO import sys  result   StringIO   sys stdout   result result string   result getvalue     If you need to do that only in some function do the following     old stdout   sys stdout      your function containing the previous lines my function    sys stdout   old stdout

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The print statement in Python converts its arguments to strings  and outputs those strings to stdout   To save the string to a variable instead  only convert it to a string   a   str tag getArtist

User · Answer

This is a standalone example showing how to save the output of a user-written function in Python 3  from io import StringIO import sys  def print audio tagging result value       print f quot value    value  quot    tag list      for i in range 0 1       save stdout   sys stdout     result   StringIO       sys stdout   result     print audio tagging result i      sys stdout   save stdout     tag list append result getvalue    print tag list

User · Answer

Please note  I wrote this answer based on Python 3 x  No worries you can assign print   statement to the variable like this   gt  gt  gt  var   print  some text   some text  gt  gt  gt  var  gt  gt  gt  type var   lt class  NoneType  gt   According to the documentation   All non-keyword arguments are converted to strings like str   does and written to the stream  separated by sep and followed by end  Both sep and end must be strings  they can also be None  which means to use the default values  If no objects are given  print   will just write end  The file argument must be an object with a write string  method  if it is not present or None  sys stdout will be used  Since printed arguments are converted to text strings  print   cannot be used with binary mode file objects  For these  use file write      instead   That s why we cannot assign print   statement values to the variable  In this question you have ask  or any function   So print   also a function with the return value with None  So the return value of python function is None  But you can call the function with parenthesis     and save the return value in this way   gt  gt  gt  var   some function    So the var variable has the return value of some function   or the default value None  According to the documentation about print    All non-keyword arguments are converted to strings like str   does and written to the stream  Lets look what happen inside the str     Return a string version of object  If object is not provided  returns the empty string  Otherwise  the behavior of str   depends on whether encoding or errors is given  as follows   So we get a string object  then you can modify the below code line as follows   gt  gt  gt  var   str some function     or you can use str join   if you really have a string object   Return a string which is the concatenation of the strings in iterable  A TypeError will be raised if there are any non-string values in iterable  including bytes objects  The separator between elements is the string providing this method   change can be as follows   gt  gt  gt  var      join some function       you can use this if some function   really returns a string value

User · Answer

somevar   tag getArtist     http   docs python org tutorial index html

User · Answer

probably you need one of  str repr or unicode functions  somevar   str tag getArtist      depending which python shell are you using

[python] Python: Assign print output to a variable

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