maurobio - 7 months ago 29

Python Question

I have strings in the format

`"1-3 6:10-11 7-9"`

`{1,2,3,6,10,11,7,8,9}`

For creating the set from the range of numbers, I have the following code:

`def create_set(src):`

lset = []

if len(src) > 0:

pos = src.find('-')

if pos != -1:

first = int(src[:pos])

last = int(src[pos+1:])

else:

return [int(src)] # Only one number

for j in range (first, last+1):

lset.append(j)

return set(lset)

But I cannot figure out how to correctly treat the ':' when it appears in the string. Can someone help me?

Thanks in advance!

EDIT: By the way, is there a more compact way of parsing such strings, perhaps using regular expressions?

Answer

Something like this might work for you:

```
s = '1-3 6:10-11 7-9'
s = s.replace(':', ' ')
lset = set()
fs = s.split()
for f in fs:
r = f.split('-')
if len(r)==1:
# add a single number
lset.add(int(r[0]))
else:
# add a range of numbers (inclusive of the endpoints)
lset |= set(range(int(r[0]), int(r[1])+1))
print(lset)
```