python challenge_6

Adding and removing dots

level of challenge = 3/10

• Write a function named add_dots that takes a string and adds "." in between each letter.
• For example

• calling add_dots("test") should return the string "t.e.s.t".

• Then, below the add_dots function,

• write another function named remove_dots that removes all dots from a string.

• For example

• calling remove_dots("t.e.s.t") should return "test".

• If both functions are correct,

• calling remove_dots(add_dots(string)) should return back the original string for any string.

Hint

• For add_dots you may find the string join method useful.
• If you don't want to use it,
• You can instead iterate over each letter in,

• The input while building up a result string that is initially empty.

• The remove_dots function is similar.

• Either use the string replace method or manually loop over the letters,

• keeping ones that aren't ".".

My solution

def add_dots(string):
    new_string = ".".join(string)
    return new_string
print(add_dots("test"))

def remove_dots(string):
    new_string = string
    result = new_string.replace(".", "")
    return result
print(remove_dots("t.e.s.t"))

print(remove_dots(add_dots("tito")))

Another solution

the longer way

def add_dots(s):
    out = ""
    for letter in s:
        out += letter + "."
    return out[:-1] # -> do not show the lest dot 

def remove_dots(s):
    out = ""
    for letter in s:
        if letter != ".":
            out += letter
    return out

the short way

def add_dots(s):
    return ".".join(s)

def remove_dots(s):
    return s.replace(".", "")

Add your solution in the comment :)

Comments

[elnaz-nasiri]

My solution is:

def add_dots(string):
    newString = '.'.join(string)
    return newString

print(add_dots("test"))

def remove_dots(string):
    splitString = string.split(".")
    newString = "".join(splitString)
    return newString


print(remove_dots("t.e.s.t"))

print(remove_dots(add_dots("test")))

[Mahmoud EL-kariouny]

Thanks for sharing you can test your solution here: pythonprinciples.com/challenges/

[Alvison Hunter Arnuero | Front-End Web Developer]

def add_dots(string):
    return ".".join(string)

def remove_dots(string):
    return string.replace(".", "")

print("With Dots: ", add_dots("test"))  # t.e.s.t
print("Without Dots: ", remove_dots("t.e.s.t"))  # test
print("Back to Original: ", remove_dots(add_dots("alvison"))) # alvison

[Mahmoud EL-kariouny]

Good job pro :)

[Alvison Hunter Arnuero | Front-End Web Developer]

Thanks, champion!

[Mahmoud EL-kariouny]

Not at all :)

[shapa]

I would prefer to use an extended class of string, it wil be much more reusable.

class Dots(str):
    def __init__(self, value: str):
        self.value = value

    def add_dots(self):
        return self.__class__(".".join(self.value))

    def remove_dots(self):
        return self.__class__(".".replace(".", ""))

msg = Dots("Hello")
print(msg.add_dots())
print(msg.add_dots().lower())

[Mahmoud EL-kariouny]

It is very good, But in my case I did have to follow the instructions
this is link of all challenges I work on it : pythonprinciples.com/challenges/