How do you replace a character in a string?

[pythondummy]

just wondering how to replace a space (' ') in a string to a dot ('.')

so far i have this...

def add_dots(game):
       for row in game:
        for char in row:
            if char == ' ':
 

thanks

[bvdet]

Since strings are immutable, you must create a new string. Following are a couple of ways:

>>> s = 'abcdef ghijk'
>>> s1 = s.replace(' ', '.')
>>> s1
'abcdef.ghijk'
>>> s2 = ''.join([[c,'.'][c == ' ' or 0] for c in s])
>>> s2
'abcdef.ghijk'
>>> 

[pythondummy]

@bvdet
hey, thanks for that. However i am using python IDLE... i can't use '.replace' i have to use range or enumerate....

[bvdet]

The last time I checked, str.replace() worked in Idle. Did you notice the list comprehension in my previous post? You could do something like that.

[Glenton]

@pythondummy
So obviously the ways that @bvdet suggested are superior, but if you really want to do it the way you suggested, then do the following (by the way, the indentation in your code was wrong - you need to be careful with python! The standard is 4 spaces for a tab, but any number is okay as long as it's consistent)

def add_dots(game):
    newgame=[]
    for row in game:
        newrow=""
        for char in row:
            if char == ' ':
                newrow+="."
            else:
                newrow+=char
        newgame.append(newrow)
    return newgame

I haven't tried it, so I'll leave it as an exercise to debug. If you're still stuck, just post back.

We'd also appreciate it if you post back how you've done good or bad!

[pythondummy]

@Glenton
haha, all good... i figured it out finally. i used enumerate

[bvdet]

Here's a couple of ways using a for loop:

>>> s
'abcdef ghijk'
>>> sList = []
>>> for letter in s:
...     if letter == " ":
...         sList.append(".")
...     else:
...         sList.append(letter)
...         
>>> "".join(sList)
'abcdef.ghijk'
>>> s
'abcdef ghijk'
>>> s1 = ''
>>> for letter in s:
...     if letter == " ":
...         s1 += "."
...     else:
...         s1 += letter
...         
>>> s1
'abcdef.ghijk'
>>>