On 13 March 2013 00:21, Jiewei Huang <jiewe...@gmail.com> wrote:
> Hi all,
>
> I'm currently stuck at this question on
>
> Writing a function len_str that takes a string as an argument and returns a
> pair consisting of the length of the string and the string itself.
>
> Example: len_str('Meaning of life') should return the tuple (15, 'Meaning of
> life').
>
>
> I can only think of this :
>
> len_str = ('welcome to life' )
>
> print (len(len_str,), len_str)
>
>
> However that not an correct answer I need to make a def len_str but I can't
> seen to get it right.
Perhaps an example will help. Let's say we have a variable called x
that we initialise with
x = 2
Here's a line of code that prints 2*x:
print(2 * x)
This will print out 4 but that's not what you want. Here's a function
that prints its argument multiplied by 2:
def double(y):
print(2 * y)
Now we have a function and we can call it with
double(x)
so that it prints 4. Again, though, you didn't want to print it. You
wanted to *return* the value. So here's a function that *returns* 2
times its argument:
def double(x):
return 2 * x
Now if we do
z = double(x)
z will have the value 4. You can check this with
print(z)
Try the code above and see if you can apply the same principles to your problem.
Oscar
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