>Note you should think VERY CAREFULLY about any user input like this. What are you going to do the user gives you too many digits, too few digits, non-digits
Thanks the solution i.e using zfill() looks simple :) , we have a check that will take care of user input than's for noticing that On Fri, Sep 1, 2017 at 11:16 PM, Rhodri James <rho...@kynesim.co.uk> wrote: > On 01/09/17 18:13, Ganesh Pal wrote: > >> "a0000" + "1" ===> expected was a0001 >>>>> >>>> 'a00001' >> > > Why would you expect that? Concatenation means "joining together", so > > >>> "foo" + "bar" > 'foobar' > > No other mangling of either of your original strings is going to happen; > there is no magic going on here. > > What you want is most easily done using the zfill() string method to pad > out the user's string with zeroes: > > >>> fixed_string = "a" > >>> user_string = "1" > >>> final_string = fixed_string + user_string.zfill(4) > 'a0001' > > Note you should think VERY CAREFULLY about any user input like this. What > are you going to do the user gives you too many digits, too few digits, > non-digits? > > -- > Rhodri James *-* Kynesim Ltd > -- > https://mail.python.org/mailman/listinfo/python-list > -- https://mail.python.org/mailman/listinfo/python-list
