How do I use user input to invoke a function in Python?

This question already has an answer here:

Calling a function of a module by using its name (a string) 10 answers

Create a raw input with commands inside a Python script 1 answer

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The error is because function names are not string you can't call function like 'func1'() it should be func1() ,

You can do like:

{
'func1':  func1,
'func2':  func2,
'func3':  func3, 
}.get(choice)()

its by mapping string to function references

side note : you can write a default function like:

def notAfun():
  print "not a valid function name"

and improve you code like:

{
'func1':  func1,
'func2':  func2,
'func3':  func3, 
}.get(choice, notAfun)()

---

If you make a more complex program it is probably simpler to use the cmd module from the Python Standard Library than to write something.
Your example would then look so:

import cmd

class example(cmd.Cmd):
    prompt  = '<input> '

    def do_func1(self, arg):
        print 'func1 - call'

    def do_func2(self, arg):
        print 'func2 - call'

    def do_func3(self, arg):
        print 'func3 - call'

example().cmdloop()

and an example session would be:

<input> func1
func1 - call
<input> func2
func2 - call
<input> func3
func3 - call
<input> func
*** Unknown syntax: func
<input> help

Undocumented commands:
======================
func1  func2  func3  help

When you use this module every function named do_* will be called when the user inputs the name without the do_ . Also a help will be automatically generated and you can pass arguments to the functions.

For more informations about this look into the Python manual (here) or into the Python 3 version of the manual for examples (here).

---

你可以使用locals

>>> def func1():
...     print 'func1 - call'
... 
>>> def func2():
...     print 'func2 - call'
... 
>>> def func3():
...     print 'func3 - call'
... 
>>> choice = raw_input()
func1
>>> locals()[choice]()
func1 - call

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