[Tutor] how to unittest cli input

[Peter Otten]

Alex Kleider wrote:

> On 2015-10-13 14:44, Alex Kleider wrote:
>> On 2015-10-13 12:11, Danny Yoo wrote:
>> 
>> 
>>> ######################
>>> def make_ask(f, l, p):
>>>     d = {'Enter your first name: ' : f,
>>>            'Enter your last name: ' : l,
>>>            'Your mobile phone #: ' : p}
>>>     return d.get
>>> ######################
> 
> This is an example of a 'closure' is it not?

It does not make big difference, but I would call the return value "bound 
method" rather than "closure". For me closure implies access to the local 
namespace of the enclosing function, e. g.

def make_ask(f, l, p):
    d = {'Enter your first name: ' : f,
           'Enter your last name: ' : l,
           'Your mobile phone #: ' : p}
    def get(key):
        return d.get(key)
    return get

Here d is looked up when get() is invoked. Let's make a modification to 
demonstrate that the current binding of d is used:

>>> def make_ask(f, l, p):
...     d = {'Enter your first name: ' : f,
...            'Enter your last name: ' : l,
...            'Your mobile phone #: ' : p}
...     def get(key):
...         return d.get(key)
...     def set_d(new_d):
...         nonlocal d
...         d = new_d
...     return get, set_d
... 
>>> get, set_d = make_ask(*"abc")
>>> get("Enter your first name: ")
'a'
>>> class WontTell:
...     def get(self, key): return "won't tell"
... 
>>> set_d(WontTell())
>>> get("Enter your first name: ")
"won't tell"