Python how to only accept numbers as a input

Question

mark= eval(raw_input(\"What is your mark?\"))
try:
    int(mark)
except ValueError:
    try:
        float(mark)
    except ValueError:
        print \"This is not a         


        

Answer 1

remove eval and your code is correct:

mark = raw_input("What is your mark?")
try:
    int(mark)
except ValueError:
    try:
        float(mark)
    except ValueError:
        print "This is not a number"

Just checking for a float will work fine:

try:
    float(mark)
except ValueError:
    print "This is not a number"