Programming language for self-modifying code?

Question

• I am recently thinking about writing self-modifying programs, I think it may be powerful and fun. So I am currently looking for a language that allows

Answer 1

May I suggest Python, a nice very high-level dynamic language which has rich introspection included (and by e.g. usage of compile, eval or exec permits a form of self-modifying code). A very simple example based upon your question:

def label1(a,b,c):
    c=a+b
    return c

a,b,c=10,20,0    
print label1(a,b,c) # prints 30

newdef= \
"""
def label1(a,b,c):
    c=a*b
    return c
"""
exec(newdef,globals(),globals())

print label1(a,b,c) # prints 200

Note that in the code sample above c is only altered in the function scope.