Why is input in Python 3 throwing NameError name is not defined

Question

I have a string variable test  in Python 2 x this works fine   test   raw input  enter the test    print test   But in Python 3 x  I do   test   input  enter the test    print test   with the input string sdas  and I get an error message  Traceback  most recent call last    File   home ananiev PycharmProjects PigLatin main py   line 5  in  lt module gt      test   input  enter the test    File   lt string gt    line 1  in  lt module gt   NameError  name  sdas  is not defined

User · Answer

sdas is being read as a variable  To input a string you need

User · Answer

I d say the code you need is   test   input  enter the test   print test    Otherwise it shouldn t run at all  due to a syntax error  The print function requires brackets in python 3  I cannot reproduce your error  though  Are you sure it s those lines causing that error

User · Answer

I got the same error  In the terminal when I typed  python filename py   with this command  python2 was tring to run python3 code  because the is written python3  It runs correctly when I type  python3 filename py  in the terminal  I hope this works for you too

User · Answer

You re running your Python 3 code with a Python 2 interpreter  If you weren t  your print statement would throw up a SyntaxError before it ever prompted you for input   The result is that you re using Python 2 s input  which tries to eval your input  presumably sdas   finds that it s invalid Python  and dies

User · Answer

In operating systems like Ubuntu python comes preinstalled  So the default version is python 2 7 you can confirm the version by typing below command in your terminal   python -V   if you installed it but didn t set default version you will see   python 2 7   in terminal  I will tell you how to set the default python version in Ubuntu   A simple safe way would be to use an alias  Place this into    bashrc or    bash aliases file   alias python python3   After adding the above in the file  run the command below   source    bash aliases or source    bashrc  now check python version again using python -V  if python version 3 x x one  then the error is in your syntax like using print with parenthesis  change it to   test   input  enter the test   print test

User · Answer

temperature   input  What s the current temperature in your city   please use the format   C or    F   gt  gt  gt          warning    the result from input will  lt str gt  on Python 3 x only     in the case of Python 2 x  the result from input is the variable type  lt int gt      for the  lt str gt  type as the result for Python 2 x it s neccessary to use the another  raw input    temp int   int temperature  -1         25  lt int gt   as example  temp str   temperature -1               C   lt str gt   as example   if temp str lower       c       print  Your temperature in Fahrenheit is      format    9 5   temp int    32           elif temp str lower       f       print  Your temperature in Celsius is      format        5 9     temp int - 32

User · Answer

If we setaside the syntax error of print  then the way to use input in multiple scenarios are -  If using python 2 x    then for evaluated input use  input  example  number   input  enter a number    and for string use  raw input  example  name   raw input  enter your name     If using python 3 x    then for evaluated result use  eval  and  input  example  number   eval input  enter a number     for string use  input  example  name   input  enter your name

[python] Why is `input` in Python 3 throwing NameError: name... is not defined

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