Why is there empty quotation marks?

Question

Given a string, return a string where for every char in the original, there are two chars.

double_char('The') → 'TThhee'

double_char('AAbb') → 'AAAAbbbb'

double_char('Hi-There') → 'HHii--TThheerree'

Solution:

    def double_char(str):
      double_char = ""
      for i in range(len(str)):
        double_char += str[i]*2
      return double_char

Hello, I'm new here, and it's my first time discovering this website and adding a question, so I'm sorry if it's a bit unclear. Can someone please explain this one in detail ? Like why it has empty quotation marks?

You have to create an empty string at first, to be able to add characters to this string later. Then, for every letter, you add that letter twice. Last step: you return the new string — kabooya, Mar 11 '21 at 14:35
to instantiate variable with empty string which is initial value. — Marek R, Mar 11 '21 at 14:35

score 0 · Answer 1 · answered Mar 11 '21 at 14:37

0

double_char = "" Create an empty string, to be able to add characters to it.

for i in range(len(str)): For every letter

double_char += str[i]*2 Add this letter twice to the string

return double_char Return the string

answered Mar 11 '21 at 14:37

kabooya

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14

score 0 · Accepted Answer · answered Mar 11 '21 at 14:40

def double_char(str):            # function double_char takes argument str
    double_char = ""             # create an empty string assign to variable double_char. In python you put "" or '' around text that you want as a string (text).
    for i in range(len(str)):    # iterate from 0 to length of string
        double_char += str[i]*2  # append character at position i from str and duplicate it
    return double_char           # return double_char

Why is there empty quotation marks?

2 Answers2