What s the difference between raw input and input in Python 3

Question

What is the difference between raw input   and input   in Python 3

User · Answer

In Python 3  raw input   doesn t exist which was already mentioned by Sven   In Python 2  the input   function evaluates your input   Example    name   input  what is your name     what is your name  harsha  Traceback  most recent call last     File   lt pyshell 0 gt    line 1  in  lt module gt      name   input  what is your name       File   lt string gt    line 1  in  lt module gt  NameError  name  harsha  is not defined   In the example above  Python 2 x is trying to evaluate harsha as a variable rather than a string  To avoid that  we can use double quotes around our input like  harsha     gt  gt  gt  name   input  what is your name    what is your name  harsha   gt  gt  gt  print name  harsha   raw input    The raw input    function doesn t evaluate  it will just read whatever you enter   Example   name   raw input  what is your name     what is your name  harsha  gt  gt  gt  name  harsha    Example     name   eval raw input  what is your name     what is your name harsha  Traceback  most recent call last     File   lt pyshell 11 gt    line 1  in  lt module gt      name   eval raw input  what is your name       File   lt string gt    line 1  in  lt module gt  NameError  name  harsha  is not defined   In example above  I was just trying to evaluate the user input with the eval function

User · Answer

If You want to ensure  that your code is running with python2 and python3  use function input    in your script and add this to begin of your script   from sys import version info if version info major    3      pass elif version info major    2      try          input   raw input     except NameError          pass else      print   Unknown python version - input function not safe

User · Answer

The difference is that raw input   does not exist in Python 3 x  while input   does   Actually  the old raw input   has been renamed to input    and the old input   is gone  but can easily be simulated by using eval input       Remember that eval   is evil  Try to use safer ways of parsing your input if possible

User · Answer

I d like to add a little more detail to the explanation provided by everyone for the python 2 users  raw input    which  by now  you know that evaluates what ever data the user enters as a string  This means that python doesn t try to even understand the entered data again  All it will consider is that the entered data will be string  whether or not it is an actual string or int or anything    While input   on the other hand tries to understand the data entered by the user  So the input like helloworld would even show the error as  helloworld is undefined     In conclusion  for python 2  to enter a string too you need to enter it like  helloworld  which is the common structure used in python to use strings

User · Answer

In Python 2  raw input   returns a string  and input   tries to run the input as a Python expression   Since getting a string was almost always what you wanted  Python 3 does that with input    As Sven says  if you ever want the old behaviour  eval input    works

User · Answer

Python 2    raw input   takes exactly what the user typed and passes it back as a string   input   first takes the raw input   and then performs an eval   on it as well     The main difference is that input   expects a syntactically correct python statement where raw input   does not   Python 3    raw input   was renamed to input   so now input   returns the exact string  Old input   was removed     If you want to use the old input    meaning you need to evaluate a user input as a python statement  you have to do it manually by using eval input

[python] What's the difference between `raw_input()` and `input()` in Python 3?

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