Question

Write a Python function that will take a string and a list as its only parameters. The function needs to return a new string that is the original string with all of the characters appearing in the list parameter replaced with an asterisk(*). The returned string needs to have the remaining characters appear in the same location as the characters they replaced.

Hint/Reminder: Note you can make a string out of characters optimally without repeatedly using the concatenation operator.

Answer 1

Here is the complete Python code: (I have added explanation of each line in the comment besides that)

def mark(word,l):

  """ This function replaces all the occurences of characters in l in word with a '*' """

  s = list(word) # We work with lists instead of strings as strings are immutable!

  for i in range(len(s)):

    if(s[i] in l): # is l contains the char replace it

      s[i] = '*'

  return "".join(s) # convert back to string

Notice that We don't need to use the concat operator multiple times and hence it is a very efficient code.

Screenshot of Code and Testing Output:

def mark(word, 1): """ This function replaces all the occurences of characters in 1 in word with a '* s = list (word) # We work with lists instead of strings as strings are immutable! for i in range(len(s)): if(s[i] in 1): # is l contains the char replace it s[i] = '*' return "".join(s) # convert back to string mark("Hello World",['o', 'l']) 'He*** W*r*d'

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