How can I convert a string to an int in Python

Question

The output I m getting for my little example app is the following   Welcome to the Calculator  Please choose what you d like to do  0  Addition 1  Subtraction 2  Multiplication 3  Division 4  Quit Application 0 Enter your first number  1 Enter your second number  1 Your result is  11   This is because the addition   method is taking the input   as strings and not numbers  How can I use them as numbers   Here is my entire script   def addition a  b       return a   b  def subtraction a  b       return a - b  def multiplication a  b       return a   b  def division a  b       return a   b  keepProgramRunning   True  print  Welcome to the Calculator    while keepProgramRunning          print  Please choose what you d like to do        print  0  Addition      print  1  Subtraction      print  2  Multiplication      print  3  Division      print  4  Quit Application          Capture the menu choice      choice   raw input            if choice     0           numberA   raw input  Enter your first number             numberB   raw input  Enter your second number             print  Your result is           print addition numberA  numberB      elif choice     1           numberA   raw input  Enter your first number             numberB   raw input  Enter your second number             print  Your result is           print subtraction numberA  numberB      elif choice     2           numberA   raw input  Enter your first number             numberB   raw input  Enter your second number             print  Your result is           print multiplication numberA  numberB      elif choice     3           numberA   raw input  Enter your first number             numberB   raw input  Enter your second number             print  Your result is           print division numberA  numberB      elif choice     4           print  Bye           keepProgramRunning   False     else          print  Please choose a valid option           print   n

User · Answer

def addition a  b       return a   b  def subtraction a  b       return a - b  def multiplication a  b       return a   b  def division a  b       return a   b  keepProgramRunning   True  print  Welcome to the Calculator    while keepProgramRunning      print  Please choose what you d like to do    print  0  Addition  print  1  Subtraction  print  2  Multiplication  print  3  Division  print  4  Quit Application      Capture the menu choice  choice   raw input        if choice     0       numberA   input  Enter your first number         numberB   input  Enter your second number         print  Your result is      str addition numberA  numberB       n  elif choice     1       numberA   input  Enter your first number         numberB   input  Enter your second number         print  Your result is      str subtraction numberA  numberB       n  elif choice     2       numberA   input  Enter your first number         numberB   input  Enter your second number         print  Your result is      str multiplication numberA  numberB       n  elif choice     3       numberA   input  Enter your first number         numberB   input  Enter your second number         print  Your result is      str division numberA  numberB       n  elif choice     4       print  Bye       keepProgramRunning   False else      print  Please choose a valid option       print   n

User · Answer

easy       if option    str 1           numberA   int raw input  enter first number              numberB  int raw input  enter second number              print             print addition numberA  numberB       etc etc etc

User · Answer

def addition a  b   return a   b  def subtraction a  b   return a - b  def multiplication a  b   return a   b  def division a  b   return a   b  keepProgramRunning   True  print  Welcome to the Calculator    while keepProgramRunning   print  Please choose what you d like to do

User · Answer

While calling your sub functions from your main functions you can convert the variables into int and then call  Please refer the below code   import sys  print  Welcome to Calculator n   print  Please find the options  n     1  Addition n     2  Subtraction n      3  Multiplication n     4  Division n     5  Exponential n     6  Quit n    def calculator        choice   input  Enter choice n        if int choice     1          a   input  Enter first number n           b   input  Enter second number n           add int a   int b        if int choice     2          a   input  Enter first number n           b   input  Enter second number n           diff int a   int b        if int choice     3          a   input  Enter first number n           b   input  Enter second number n           mult int a   int b        if int choice     4          a   input  Enter first number n           b   input  Enter second number n           div float a   float b        if int choice     5          a   input  Enter the base number n           b   input  Enter the exponential n           exp int a   int b        if int choice     6          print  Bye           sys exit 0     def add a  b       c   a b     print  Sum of    and    is     format a  b  c    def diff a b       c   a-b     print  Difference between    and    is     format a  b  c    def mult a  b       c   a b     print  The Product of    and    is     format a  b  c    def div a  b       c   a b     print  The Quotient of    and    is     format a  b  c    def exp a  b       c   a  b     print  The result of    to the power of    is     format a  b  c    calculator     Here what I did is I called each of the function while converting the parameters inputted to int  I hope this has been helpful   In your case it could be changed like this    if choice     0           numberA   raw input  Enter your first number             numberB   raw input  Enter your second number             print  Your result is           print addition int numberA   int numberB

User · Answer

gt  gt  gt  a    123   gt  gt  gt  int a  123   Here s some freebie code   def getTwoNumbers        numberA   raw input  Enter your first number         numberB   raw input  Enter your second number         return int numberA   int numberB

User · Answer

Don t use str   method directly in html instead use with y x string     lt div class  row  gt         for x in range photo upload count                with y x string            lt div col-md-4  gt           lt div class  col-md-12  gt               lt div class  card card-primary    style  border 1px solid  000  gt                   lt div class  card-body  gt                         if data  profile photo     None                              lt img class  profile-user-img img-responsive  src     data  photo   y      width  200px  alt  User profile picture  gt                         else                              lt img class  profile-user-img img-responsive  src  static img user png  width  200px  alt  User profile picture  gt                         endif                     lt  div gt                   lt div class  card-footer text-center  gt                       lt a href    value  edit photo     photo   y     class  btn btn-primary  gt Edit lt  a gt                   lt  div gt               lt  div gt           lt  div gt       lt  div gt         endwith           endfor     lt  div gt

User · Answer

Perhaps the following  then your calculator can use arbitrary number base  e g  hex  binary  base 7  etc    untested   def convert str       try          base   10    default         if     in str              sstr   str split                  base  str   int sstr 0    sstr 1          val   int str  base      except ValueError          val   None      return val  val   convert raw input  Enter value       10       Decimal   16 a     Hex  10   2 1010   Binary  10

User · Answer

Since you re writing a calculator that would presumably also accept floats  1 5  0 03   a more robust way would be to use this simple helper function   def convertStr s          Convert string to either int or float         try          ret   int s      except ValueError           Try float          ret   float s      return ret   That way if the int conversion doesn t work  you ll get a float returned   Edit  Your division function might also result in some sad faces if you aren t fully aware of how python 2 x handles integer division    In short  if you want 10 2 to equal 2 5 and not 2  you ll need to do from   future   import division or cast one or both of the arguments to float  like so    def division a  b       return float a    float b

[python] How can I convert a string to an int in Python?

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