CODEWITHSUNDEEP
pythonpython-3.xfile
Flaried
Flaried

Reputation: 39

How Do I Replace Lines in a for Loop

The File I'm editing

45940736:1330:0.266667:1602990684:10023084.555000
48545806:16000000:0.000000:9999999999:0.000000
1191125008:1185:37.408333:1602991293:10282893.310000
116776982:1811:0.637500:1602990076:10022476.137000

My Code

f = open("values", "r+")
lines = f.readlines()

for i in lines:
    if str(IDS) in i:
        spl = i.split(":")
        asset_id = spl[0]
        value = spl[1]
        volume = spl[2]
        updated = spl[3]
        item_age = spl[4]
        new_line = asset_id + ":" + "this is a test" + ":"+ volume + ":" + updated + ":" + item_age
        old_line = i
        print(new_line)

How would I replace the line while in the for loop instead of doing

lines[0] = new_line
ff = open('values', 'w')
ff.writelines(lines)

I can't do that because some files will have 2k values and I need to change all of them.

Upvotes: 0

Views: 359

Answers (1)

Barmar
Barmar

Reputation: 781058

Use enumerate() so you get the index in the list, so you can replace the element.

for index, i in enumerate(lines):
    if str(IDS) in i:
        spl = i.split(":")
        asset_id = spl[0]
        value = spl[1]
        volume = spl[2]
        updated = spl[3]
        item_age = spl[4]
        new_line = asset_id + ":" + "this is a test" + ":"+ volume + ":" + updated + ":" + item_age
        old_line = i
        lines[index] = new_line

Upvotes: 1

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