>>> x = 'xpple bxnxnx cherry'
>>> a = x.replace(x,a) # replaces x with a
'apple banana cherry'
>>> first_a = x.replace(x,a,1) # only replaces first a
'apple bxnxnx cherry'
# Python3 program to demonstrate the
# use of replace() method
string = "geeks for geeks geeks geeks geeks"
# Prints the string by replacing geeks by Geeks
print(string.replace("geeks", "Geeks"))
# Prints the string by replacing only 3 occurrence of Geeks
print(string.replace("geeks", "GeeksforGeeks", 3))
>>> s = list("Hello zorld")
>>> s
['H', 'e', 'l', 'l', 'o', ' ', 'z', 'o', 'r', 'l', 'd']
>>> s[6] = 'W'
>>> s
['H', 'e', 'l', 'l', 'o', ' ', 'W', 'o', 'r', 'l', 'd']
>>> "".join(s)
'Hello World'
my_text = 'Aello world'
my_text = my_text.replace(my_text[0], 'H')
print (my_text)
mytext = 'Hello Zorld'
mytext = mytext.replace('Z', 'W')
print mytext,