How to reverse a list without specific elements being reversed in python

Question

f = open (FilePath, "r")

#print f

with open(FilePath, "r") as f:

    lines = f.readlines()
    #print lines


    for iterms in lines:
        new_file = iterms[::-1]
        print new_file

it gives me a result like this: 7340.12,8796.4871825,0529.710635,751803.0,fit.69-81-63-40tuo

original list is like this: out04-32-45-95.tif,0.330693,536043.5237,5281852.0362,20.2260

it is supposed to be like this: 20.2260, ...........out04-32-45-95.tif

I suspect you want to be splitting your lines (or perhaps using the csv module, which will split it for you in a slightly more sophisticated way). Then you can reverse the list of strings before re-joining them with commas, rather than reversing a single string. — Blckknght
– Blckknght, Commented Sep 23, 2017 at 6:41

Moinuddin Quadri · Accepted Answer · 2017-09-23 06:44:52Z

2

You should be using your for loop like:

for iterms in lines:
    new_file = ','.join(iterms.split(',')[::-1])
    print new_file

Explanation:

In your current code, the line iterms[::-1] reverses the entire string present in your line. But you want to only reverse the words separated by ,.

Hence, you need to follow below steps:

Split the words based on , and get list of words:
```
word_list = iterms.split(',') 
```
Reverse the words in the list:
```
reversed_word_list = word_list[::-1]
```

Join the reversed wordlist with ,

new_line = ','.join(reversed_word_list)

edited Sep 23, 2017 at 6:44

answered Sep 23, 2017 at 6:39

Moinuddin Quadri

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