how to print only the return values of a function?

Question

I would like to learn how to print only the return value of a function.

I.E.

def dude():
  print("Hello")
  return 1

I would like to print only the return value and not the all of the functions process. I would like to use the function and be able to use a different command to get just the values of return,without suppresing print.As print(dude()) prints Hello and the return value.

Looks like it's really a case of wanting proper logging: https://stackoverflow.com/questions/6918493/in-python-why-use-logging-instead-of-print — Flexo, Mar 20 '18 at 09:03

TTT · Answer 1 · 2018-03-19T18:15:39.277

1

Decorate your dude!

def dude_is_decorated(f):
  def wrap(*args, **kwargs):
    import os
    import sys
    nothing = open(os.devnull, 'w')
    sys.stdout = nothing
    sys.stderr = nothing # remove if you want your exceptions to print
    output = f()
    nothing.close()
    sys.stdout = sys.__stdout__
    sys.stderr = sys.__stderr__
    return output
  return wrap

@dude_is_decorated
def dude():
  print("Hello")
  return 1

print(dude())

output:

1

edited Mar 19 '18 at 18:15

answered Mar 19 '18 at 18:09

TTT

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And `sys.stderr`, too? – DYZ Mar 19 '18 at 18:13
Right, the exceptions should probably be visible. – DYZ Mar 19 '18 at 18:15
@TeachMeEverything Works for me. Did you forget the `@dude_is_decorated` part? – DYZ Mar 19 '18 at 18:17

TeachMeEverything · Accepted Answer · 2018-03-23T17:14:50.710

This seems to work better:

def dude(x,y):
    z= x+y:
    print ("Hello")
    return z

    print(str(dude(2,3))[1:len(str(dude(2,3)))-1])

While it is ugly, It works and does not break anything else and I can make it a function. It can output just the values , it would just need more work for separating values to be used by another bit of code. It is still ugly and I was hoping for a simple solution like print(dude(2,3).return) that would be clean. I find this very useful for more complex mathematical calculations I have made. With a tiny bit of work I made this a function that automatically outputs single and multiple values. the premise remained the same , str(dude()) was the easy solution.

how to print only the return values of a function?

2 Answers2