CODEWITHSUNDEEP
pythonpython-3.xsorting
Suliman Sharif
Suliman Sharif

Reputation: 607

How to select specifics in a file and sort them

So to put it simply lets say have data in a file that begins with 

Start
47 Data
70 Data
60 Data
Finish

Start 
56 Data
86 Data
75 Data
Finish

How do I read in the file and have each data within the Start and Finish sorted respectively?

The Output would look liek

Start
47 Data
60 Data
70 Data
Finish

Start
56 Data
75 Data
86 Data
Finish

I really don't know how to apply the sort method selectively?

Upvotes: 0

Views: 33

Answers (1)

Jean-François Fabre
Jean-François Fabre

Reputation: 140168

you could make a list of lists, store each block in a list, then sort all lists:

data = []
with open("data.txt") as f:
    for l in f:
        l = l.strip()
        if l:  # discard empty lines
            if l=="Start":
                # create a new list
                data.append([])
            elif l=="Finish":  # we don't really need that tag, we have "Start"
                pass
            else:
                data[-1].append(l)  # append to current list (last one)

# list comprehension to order sub-lists
sorted_data = [sorted(d) for d in data]

# print sorted in console
for d in data:
    print("Start")
    for i in d:
        print(i)
    print("Finish\n")

Upvotes: 2

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