How to get the Items between two certain Symbols in a List-CodePudding

So I made a Example List looking like this:

dataList = ["tv", "•", "tv", "tv", "•", "tv", "•", "tv", "tv", "•"]

I want to print out the Items that are enclosed by •.

In this example,

tv, tv
tv
tv, tv

I came up with the following code:

num = 0
num2 = 0
index = 0
boolean = True

for index, elem in enumerate(dataList2):
    boolean = True
    num = index   1,
    num = int(num[0])
    if elem == "•":
        counter = 0
        if boolean:
            boolean = False
            for elem2 in dataList2[num:]:
                counter = counter   1,
                counter = int(counter[0])
                if elem2 == "•":
                    print("\n")
                    num2 = counter   num,
                    num2 = int(num2[0])
                    for el in dataList2[num:num2]:
                        print(el, end=" ")

I get this output:

tv tv • 

tv tv • tv • 

tv tv • tv • tv tv • 

tv • 

tv • tv tv • 

tv tv •

As you can see I get the unwanted behaviour that

tv tv • tv •

tv tv • tv • tv tv •

tv • tv tv •

are included in the output. I tried to fix the behaviour with a boolean but that didnt work out. What did I do wrong?

CodePudding user response：

One possible approach would be to find the indices of the special character, and split the list into chunks between the first and last occurrence:

indices = [i for i, v in enumerate(dataList) if v == "•"]
result = [dataList[indices[i - 1]   1:indices[i]] for i in range(1, len(indices))]

For your input, you get

>>> result
[['tv', 'tv'], ['tv'], ['tv', 'tv']]

Now you can print and do other things with that value. For example:

>>> for s in result:
...     print(*s, sep=', ')
tv, tv
tv
tv, tv

It's always better to compute intermediate results than just print them if you plan to reuse them for something else.

CodePudding user response：

dataList = ["tv", "•", "tv", "tv", "•", "tv", "•", "tv", "tv", "•"]
searchFor = "•"
allVals = []
isFound = False
oldIdx = -1
for idx, item in enumerate(dataList):
    if item == searchFor:
        if isFound:
            # loop complete
            allVals.append(dataList[oldIdx   1 : idx ])
            isFound = False
        else:
            isFound = True
            oldIdx = idx

allVals
[['tv', 'tv'], ['tv', 'tv']]

allStrings = [",".join(x) for x in allVals]

allStrings
['tv,tv', 'tv,tv']

CodePudding user response：

Try the below

data = ["tv", "•", "tv", "tv", "•", "tv", "•", "tv", "tv", "•"]
temp = []
counter = 0
for d in data:
  if d == "•":
    if counter == 1:
      print(','.join(temp))
      temp = []
      counter = 1
    else:
      counter  = 1
  else:
    if counter != 0:
      temp.append(d)
if temp:
  print(','.join(temp))

output

tv,tv
tv
tv,tv

CodePudding user response：

Just a slightly shorter version of the iterative solutions

dataList = ["tv", "•", "tv", "tv", "•", "tv", "•", "tv", "tv", "•"]

sub = ['tv']
for i in dataList:
    if i == '•':
        if sub[0] == '•':
            print(*sub[1:], sep=', ')
        sub = []
    sub  = [i]

Output

tv, tv
tv
tv, tv