converting string to long in python

Question

Python provides a convenient method long   to convert string to long   long  234        converts  234  into a long  If user keys in 234 89 then python will raise an error message   ValueError  invalid literal for long   with base 10   234 89    How should we a python programmer handles scenarios where a string with a decimal value     Thank you

User · Accepted Answer

longcan only take string convertibles which can end in a base 10 numeral  So  the decimal is causing the harm  What you can do is  float the value before calling the long  If your program is on Python 2 x where int and long difference matters  and you are sure you are not using large integers  you could have just been fine with using int to provide the key as well   So  the answer is long float  234 89    or it could just be int float  234 89    if you are not using large integers  Also note that this difference does not arise in Python 3  because int is upgraded to long by default  All integers are long in python3 and call to covert is just int

User · Answer

Well  longs can t hold anything but integers    One option is to use a float   float  234 89    The other option is to truncate or round   Converting from a float to a long will truncate for you   long float  234 89      gt  gt  gt  long float  1 1    1L  gt  gt  gt  long float  1 9    1L  gt  gt  gt  long round float  1 1     1L  gt  gt  gt  long round float  1 9     2L

[python] converting string to long in python

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