str type also has a method for replacing occurences of one sub-string with another sub-string in a given string. For more demanding cases, one can use
str.replace(old, new[, count]):
str.replace takes two arguments
new containing the
old sub-string which is to be replaced by the
new sub-string. The optional argument
count specifies the number of replacements to be made:
For example, in order to replace
'spam' in the following string, we can call
old = 'foo' and
new = 'spam':
>>> "Make sure to foo your sentence.".replace('foo', 'spam') "Make sure to spam your sentence."
If the given string contains multiple examples that match the
old argument, all occurrences are replaced with the value supplied in
>>> "It can foo multiple examples of foo if you want.".replace('foo', 'spam') "It can spam multiple examples of spam if you want."
unless, of course, we supply a value for
count. In this case
count occurrences are going to get replaced:
>>> """It can foo multiple examples of foo if you want, \ ... or you can limit the foo with the third argument.""".replace('foo', 'spam', 1) 'It can spam multiple examples of foo if you want, or you can limit the foo with the third argument.'