python int function

Question

The code below shows error if a decimal  eg  49 9  is sent to next variable  Can you please tell me why  Why does int   converts it into an integer   next raw input   gt     how much   int next  if how much  lt  50      print Nice  you re not greedy  you win      exit 0  else      dead  You greedy bastard      If I dont use int   or float   and just use   how much next   then it moves to  else  even if I give the input as 49 8

User · Answer

Use float   in place of int   so that your program can handle decimal points  Also  don t use next as it s a built-in Python function  next      Also you code as posted is missing import sys and the definition for dead

User · Answer

Integers  int for short  are the numbers you count with 0  1  2  3     and their negative counterparts     -3  -2  -1 the ones without the decimal part   So once you introduce a decimal point  your not really dealing with integers  You re dealing with rational numbers  The Python float or decimal types are what you want to represent or approximate these numbers   You may be used to a language that automatically does this for you Php   Python  though  has an explicit preference for forcing code to be explicit instead implicit

User · Answer

As the other answers have mentioned  the int operation will crash if the string input is not convertible to an int  such as a float or characters   What you can do is use a little helper method to try and interpret the string for you   def interpret string s       if not isinstance s  basestring           return str s      if s isdigit            return int s      try          return float s      except ValueError          return s   So it will take a string and try to convert it to int  then float  and otherwise return string  This is more just a general example of looking at the convertible types  It would be an error for your value to come back out of that function still being a string  which you would then want to report to the user and ask for new input   Maybe a variation that returns None if its neither float nor int   def interpret string s       if not isinstance s  basestring           return None     if s isdigit            return int s      try          return float s      except ValueError          return None  val raw input   gt     how much interpret string val  if how much is None        ask for more input  Error

User · Answer

import random import time import sys while True      x random randint 1 100      print    Guess my number--it s from 1 to 100          z 0     while True          z z 1         xx int str sys stdin readline             if xx  gt  x              print  Too High            elif xx  lt  x              print  Too Low            elif xx  x              print  You Win   You used  s guesses    z               print               break         else              break   in this  I first string the number str    which converts it into an inoperable number  Then  I int   integerize it  to make it an operable number  I just tested your problem on my IDLE GUI  and it said that 49 8  lt  50

User · Answer

int   only works for strings that look like integers  it will fail for strings that look like floats  Use float   instead

[python] python int( ) function

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