How do you insert a symbol in python?

Is there any function in Python that I can use to insert a value in a certain position of a string?

Something like this:

"3655879ACB6" then in position 4 add "-" to become "3655-879ACB6"

martineau

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asked Mar 10, 2011 at 1:32

Michel AndradeMichel Andrade

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No. Python Strings are immutable.

>>> s='355879ACB6'
>>> s[4:4] = '-'
Traceback [most recent call last]:
  File "", line 1, in 
TypeError: 'str' object does not support item assignment

It is, however, possible to create a new string that has the inserted character:

>>> s[:4] + '-' + s[4:]
'3558-79ACB6'

answered Mar 10, 2011 at 1:34

2

This seems very easy:

>>> hash = "355879ACB6"
>>> hash = hash[:4] + '-' + hash[4:]
>>> print hash
3558-79ACB6

However if you like something like a function do as this:

def insert_dash[string, index]:
    return string[:index] + '-' + string[index:]

print insert_dash["355879ACB6", 5]

answered Mar 10, 2011 at 1:39

2

As strings are immutable another way to do this would be to turn the string into a list, which can then be indexed and modified without any slicing trickery. However, to get the list back to a string you'd have to use .join[] using an empty string.

>>> hash = '355879ACB6'
>>> hashlist = list[hash]
>>> hashlist.insert[4, '-']
>>> ''.join[hashlist]
'3558-79ACB6'

I am not sure how this compares as far as performance, but I do feel it's easier on the eyes than the other solutions. ;-]

answered Mar 10, 2011 at 1:48

jathanismjathanism

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Simple function to accomplish this:

def insert_str[string, str_to_insert, index]:
    return string[:index] + str_to_insert + string[index:]

answered Mar 16, 2017 at 10:26

vatsugvatsug

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Python 3.6+ using f-string:

mys = '1362511338314'
f"{mys[:10]}_{mys[10:]}"

gives

'1362511338_314'

amain

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answered Apr 24, 2020 at 19:14

DarinPDarinP

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I have made a very useful method to add a string in a certain position in Python:

def insertChar[mystring, position, chartoinsert ]:
    longi = len[mystring]
    mystring   =  mystring[:position] + chartoinsert + mystring[position:] 
    return mystring  

for example:

a = "Jorgesys was here!"

def insertChar[mystring, position, chartoinsert ]:
    longi = len[mystring]
    mystring   =  mystring[:position] + chartoinsert + mystring[position:] 
    return mystring   

#Inserting some characters with a defined position:    
print[insertChar[a,0, '-']]    
print[insertChar[a,9, '@']]    
print[insertChar[a,14, '%']]   

we will have as an output:

-Jorgesys was here!
Jorgesys @was here!
Jorgesys was h%ere!

answered Feb 4, 2016 at 15:13

JorgesysJorgesys

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I think the above answers are fine, but I would explain that there are some unexpected-but-good side effects to them...

def insert[string_s, insert_s, pos_i=0]:
    return string_s[:pos_i] + insert_s + string_s[pos_i:]

If the index pos_i is very small [too negative], the insert string gets prepended. If too long, the insert string gets appended. If pos_i is between -len[string_s] and +len[string_s] - 1, the insert string gets inserted into the correct place.

answered Feb 7, 2020 at 1:57

Gary02127Gary02127

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If you need to insert a given char at multiple locations, always consider creating a list of substrings and then use .join[] instead of + for string concatenation. This is because, since Python str are mutable, + string concatenation always adds an aditional overhead. More info can be found here.

answered Jul 25 at 22:06

WenukaWenuka

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If you want many inserts

from rope.base.codeanalyze import ChangeCollector

c = ChangeCollector[code]
c.add_change[5, 5, '']
c.add_change[10, 10, '']
rend_code = c.get_changed[]

answered May 31, 2015 at 15:27

enomadenomad

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