Read any function in runtime

[joao abrantes]

Hey. I want to make a program like this:

print "Complete the function f(x)="

then the user would enter x+2 or 1/x or any other function that only uses
the variable x. Then my python program would calculate f(x) in some points
for example in f(2),f(4).. etc . How can I do this?
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