isco.py $x$

molecule.py

$"$

allmolecule.py

dis.py $x$

gu$.$py

fingort math

$fp=0$ ang $("$isco$.$xyz$","$r$")$

net $=$ int $($fp$.$readline $())$

comment $=$ fp$.$readline$()$

all$\_$lists $=[]$

atom range$($net$)$:

line $=$ fp$.$readline$().$split$()$

all$\_$lists.append$([$line$[0],$ flog $($line$[1]),$ filoat$($line$[2]),$ loat $($line$[3])])$

point$1\_$input $=$ input $("$Enter the number of atom $")$

point$2\_$input $=$ input $("$Enter the number of atom $")$

$17$ point$\_\_$input $==$ point$2\_$input:

$("$You used the same atom for both points."$)$

oth:

point$1=$ all$\_$lists int$($point$1\_$input$)$