Looping through a string, need the index of that string

Question

Python novice. I'm looping through a string, and I need to be able to index the location of each character in the string. However, .index() just gives me the first time the character pops up, and I need the location of the exact character I'm looping through.

string = "AT ST!"
for i in string[1:]:
    ind = string.index(i)      #only finds first instance
    quote = string[ind-1] + i
    print(quote)

Let's say I want this to return

AT
T 
 S
ST   #what I want
T!

but instead it would return

AT
T 
 S
AT   #heck
T!

Any help would be appreciated!

user2390182 · Accepted Answer · 2020-10-21 17:05:49Z

2

You can use enumerate to iterate indeces and chars in parallel:

for ind, i in enumerate(string[1:], 1):
    quote = string[ind-1] + i
    print(quote)

Or even better, use slices:

for i in range(1, len(string)):
    print(string[i-1:i+1])

answered Oct 21, 2020 at 17:05

user2390182

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Comments

rohit vinod · Accepted Answer · 2020-10-21 17:26:12Z

0

Use the enumerate() method.

string = "AT ST!"
for i, s in enumerate(string[1:]:
    quote = string[i] + s
    print(quote)

answered Oct 21, 2020 at 17:26

rohit vinod

1

Comments

Alam Sk · Accepted Answer · 2020-10-21 19:30:59Z

0

In this kind of scenario its better not to use index as is suggested by schwobaseggl. But Just for the sake of using index in this example below is the way you can use it. index can take parameters of start and end index so it will only search between those indexes so you can pass the current index as starting index in this example.

list.index(element, start, end)

for ind,i in enumerate(string[1:],1):
    ind = string.index(i,ind)     
    quote = string[ind-1] + i
    print(quote)```

edited Oct 21, 2020 at 19:30

answered Oct 21, 2020 at 17:22

Alam Sk

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Comments

Shaido · Accepted Answer · 2020-10-22 06:27:23Z

0

You could attain this by looping through the index position using the range and len functions in python like this:

string = "AT ST!"  
for i in range(len(string) - 1):  
    print(string[i]+string[i+1])

The .index() function is working as it is supposed to, it actually starts searching from the first index.

edited Oct 22, 2020 at 6:27

Shaido

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answered Oct 21, 2020 at 17:12

Shubham Chaudhary

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