Question

Who could help me to understand the behavior of Python in this function?

I'm trying to convert into integers some numeric strings inside a list.

Numbers = ('1', '2', '3', '4')

def StrToInt(x):
for i in x:
print i
int(i)

I think it doesn't work because function assign a value to a local variable. But, if a try something like:

def StrToInt(x):
for i in x:
print i
int(i)
return x

or

def StrToInt(x):
global x
for i in x:
print i
int(i)

both functions doesn't work either.

Answer 1

numbers = ['1' ,'2' ,'3'] # our list of numeric strings

def toInt(x): # a function which will use x, here a list of strings
a = [ ] # create an empty list to hold our integers
for n in x: # for each entry in the list x
a.append(int(n)) # put the int value of n into our list
return a # return our list of integers

b = toInt(numbers) # let's test it
print(b)
[1,2,3] # Surprise!

Answer 2

Yes. As Snark says. You need to add the converted strings to a list to be returned.

Answer 3

Nice Snark!!! Thank a lot!!!! Take your medal. You deserve a lot of it!