Read any function in runtime

Matt McCredie mccredie at gmail.com
Fri Oct 23 18:39:40 CEST 2009


joao abrantes <senhor.abrantes <at> gmail.com> writes:

> 
> 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?
> 

check out 'eval' or 'exec'. 

statement = raw_input("Complete the function f(x)=")
print eval(statement, {'x':2})
print eval(statement, {'x':4})
print eval(statement, {'x':6})


or with 'exec':

statement = raw_input("Complete the function f(x)=")
exec "f = lambda x:"+statement in {}

print f(2)
print f(4)
print f(6)


Matt McCredie





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