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Python: Find the first repeated character of a given string where the index of first occurrence is smallest

Python String: Exercise-54 with Solution

Write a Python program to find the first repeated character of a given string where the index of first occurrence is smallest.

Sample Solution:-

Python Code:

def first_repeated_char_smallest_distance(str1):
  temp = {}
  for ch in str1:
    if ch in temp:
      return ch, str1.index(ch);
    else:
      temp[ch] = 0
  return 'None'
print(first_repeated_char_smallest_distance("abcabc"))
print(first_repeated_char_smallest_distance("abcb"))
print(first_repeated_char_smallest_distance("abcc"))
print(first_repeated_char_smallest_distance("abcxxy"))
print(first_repeated_char_smallest_distance("abc"))))

Sample Output:

('a', 0)
('b', 1)
('c', 2)
('x', 3)
None

Pictorial Presentation:

Python String: Find the first repeated character of a given string where the index of first occurrence is smallest
Python String: Find the first repeated character of a given string where the index of first occurrence is smallest
Python String: Find the first repeated character of a given string where the index of first occurrence is smallest
Python String: Find the first repeated character of a given string where the index of first occurrence is smallest
Python String: Find the first repeated character of a given string where the index of first occurrence is smallest

Flowchart:

Flowchart: Find the first repeated character of a given string where the index of first occurrence is smallest

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Python: Tips of the Day

Check if a given key already exists in a dictionary:

In is the intended way to test for the existence of a key in a dict.

d = {"key1": 10, "key2": 23}

if "key1" in d:
    print("this will execute")

if "nonexistent key" in d:
    print("this will not")

If you wanted a default, you can always use dict.get():

d = dict()

for i in range(100):
    key = i % 10
    d[key] = d.get(key, 0) + 1

and if you wanted to always ensure a default value for any key you can either use dict.setdefault() repeatedly or defaultdict from the collections module, like so:

from collections import defaultdict

d = defaultdict(int)

for i in range(100):
    d[i % 10] += 1

but in general, the in keyword is the best way to do it.

Ref: https://bit.ly/2XPMRyz