Separate specific characters in a list with strings-CodePudding

I have this list:

List:
00001:GR00034.asd
00001:GR00020.asd
00001:GR00002.asd
...

I want to convert these lines in something like this:

List:
GR34
GR20
GR2
...

I've tried using loops but I can't make it work:

(indexes is the first list presented before)

for idx in indexes: #to limit between  the ":" and the "."

    i = ((idx).index(":"))
    f = ((idx.index(".")))
    idx = idx[i 1:f]
    list1 = []

    for pos in idx: #Iterate trough each character in idx
        if pos.isalpha():
            list1.append(pos)
        else:
            if pos != "0":
                list1.append(pos)
                if idx[-1] == 0: #to add a 0 at the end if necessary 
                   list1 =0

My output is this:

Index List:
1      G
2      R
3      2
4      1

(Just appears the last iteration and separated)

CodePudding user response：

So the problem is stems from the fact your "list1" variable is nested inside the for loop. This means that everytime your loop is iterated, list1 gets reset. To avoid that, you have to define list1 outside of the loop and append to it at the end of each loop. For example:

list1 = []
for idx in indexes: #to limit between  the ":" and the "."

    i = ((idx).index(":"))
    f = ((idx.index(".")))
    idx = idx[i 1:f]
    entry = ""
    for pos in idx: #Iterate trough each character in idx

        if pos.isalpha():
            entry = entry   pos
        else:
            if pos != "0":
                entry = entry   pos
                if idx[-1] == '0': #to add a 0 at the end if necessary 
                    entry = entry   '0'
        
    list1.append(entry)

Here I defined a new variable "entry" that will add all the desired character through the loop, and before the loop resets, I append entry to list1 giving us the characters "G" "R" and non-zeros.

This gives the output: ['GR34', 'GR20', 'GR2']

CodePudding user response：

I don't have enough reputation to comment, so to add to patrick7's post,the final two lines should have 0 as a string, not as an integer

 if idx[-1] == "0": #to add a 0 at the end if necessary 
      list1 ="0"