Python: for loop iteration accumulate values in string variable

Question

Say I have a for loop that iterates through the characters in a string one by one.

Ex:

string_x = "abc"
 for i in range (0, len(string_x))
     data = str(string_x[i])
     print(data)

The output gives me a, b, c one by one.

Now I want to group this back into a different string after I scramble it character by character. I already figured out how to scramble it, but I can't just append it back to a string inside the loop because it overrides the string value each iteration and only ends up with one character such as 'b'. I want the for loop to create a new string named string_y that can incrementally have new characters appended to it without overriding the whole string every loop iteration. Any ideas?

Your question is not much clear, can you gives the excepted outputs ? — Arun
– Arun, Commented Jun 5, 2017 at 6:02

Arun · Accepted Answer · 2017-06-05 06:10:16Z

2

I think you are looking for this

string_x = "abc"
data = ""
for i in range (0, len(string_x)):
    data += str(string_x[i])
print(data)

output

abc

you can use += or data = data + str(string_x[i])

answered Jun 5, 2017 at 6:10

Arun

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1 Comment

Infinity Loop Over a year ago

I knew it was simple. Thanks. I've been up too long.

CDtoday · Accepted Answer · 2017-06-05 06:17:20Z

2

Not pretty clear question, but I'll give it a try.

Since you didn't mention it, I'll just presume that you got something like a scrambled list like scrambled_list = ['c', 'a', 'b'].

I guess you're asking for something like ''.join(scrambled_list), which will give you 'cab'.

scrambled_list = ['c', 'a', 'b']
sep = ''
output = sep.join(scrambled_list)

print(output)
'cab'

the join() method of string returns a string concatenate by the seperater, so

'-'.join(scrambled_list) will gives you 'c-a-b'.

answered Jun 5, 2017 at 6:17

CDtoday

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Comments

Shai · Accepted Answer · 2017-06-05 06:09:01Z

0

Try using += (as suggested by xzoert in his comment)

string_x = 'abc'
string_y = ''  # init to empty string
for c in string_x:
    string_y += c  # add a character to string_y
print string_y

answered Jun 5, 2017 at 6:09

Shai

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Comments

Arpit · Accepted Answer · 2017-06-05 06:11:59Z

In order to add letter b to an existing string_y suppose, you'll have to concatenate it to the existing string_y like

string_y = string_y + 'b'

or in the above loop, it would be

string_x = "abc"
string_y = ""
 for i in range (0, len(string_x))
     data = str(string_x[i])
     print(data)
     string_y = string_y + data

Since strings are immutable data types in Python, concatenating two strings together actually creates a third string which is the combination of the previous two. So it's more efficient to add the letters to a list and combine it into a string.

string_x = "abc"
stringlist = []
 for i in range (0, len(string_x))
     data = str(string_x[i])
     print(data)
     stringlist.append(data)
string_y = "".join(stringlist)

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