How to add commas at required positions in the given string in Python? In my case, the positions are not fixed.
Example: My requirement is to add the commas after 5th, 8th, 11th, 13th in an input string = "hello Python program"
My expected output would be: hello, Py,tho,n p,rogram
Is there any simplest way to achieve this in Python?
Actually I need to apply a comma on 590 positions in my file record and then process it.
Strings are immutable in python, so if you're going to perform modifications on the string, it would be more efficient to convert the string to a list first. You can then call str.join on the string once you're done.
string = list("hello Python program") # somewhat counterintuitive a name
for i, j in enumerate([5, 8, 11, 13]):
string.insert(i + j, ',')
print(''.join(string))
'hello, Py,tho,n ,program'
>>> string = "hello Python program"
>>> commas = [5, 8, 11, 13]
One way (probably the most efficient):
>>> ','.join(string[i:j] for i, j in zip([None] + commas, commas + [None]))
'hello, Py,tho,n ,program'
Another (for this one, commas should be a set for efficiency):
>>> ''.join(c + ',' * (i in commas) for i, c in enumerate(string, 1))
'hello, Py,tho,n ,program'
Another:
>>> a = list(string)
>>> for i in reversed(commas):
a.insert(i, ',')
>>> ''.join(a)
'hello, Py,tho,n ,program'
Use this function:
def insertc(index,s,c):
return s[:index]+c+s[index:]
s='hello Python program'
j=0
for i in [5,8,11,13]:
s=insertc(i+j,s,',')
j+=1
print(s)
