simonh wrote:
> In my attempt to learn Python I'm writing a small (useless) program to
> help me understand the various concepts. I'm going to add to this as I
> learn to serve as a single place to see how something works,
> hopefully. Here is the first approach:
> That works fine. Then I've tried to use functions instead. The first
> two work fine, the third fails:
> def getName():
> name = input('Please enter your name: ')
> print('Hello', name)
>
> def getAge():
> while True:
> try:
> age = int(input('Please enter your age: '))
> break
> except ValueError:
> print('That was not a valid number. Please try again.')
>
> def checkAge():
> permitted = list(range(18, 31))
> if age in permitted:
> print('Come on in!')
> elif age < min(permitted):
> print('Sorry, too young.')
> elif age > max(permitted):
> print('Sorry, too old.')
>
> getName()
> getAge()
> checkAge()
>
> I get this error message: NameError: global name 'age' is not
> defined.
>
> I'm stuck, can someone help? Thanks.
Generally, when you calculate something within a function you tell it the
caller by returning it:
>>> def get_age():
... return 74
...
>>> get_age()
74
>>> age = get_age()
>>> age
74
And if you want a function to act upon a value you pass it explicitly:
>>> def check_age(age):
... if 18 <= age <= 30:
... print("Come in")
... else:
... print("Sorry, you can't come in")
...
>>> check_age(10)
Sorry, you can't come in
>>> check_age(20)
Come in
To check the age determined by the get_age() function you do:
>>> age = get_age()
>>> check_age(age)
Sorry, you can't come in
Peter
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