﻿ Python: Create a new string with no duplicate consecutive letters from a given string - w3resource

# Python: Create a new string with no duplicate consecutive letters from a given string

## Python Basic - 1: Exercise-102 with Solution

Write a Python program to create a new string with no duplicate consecutive letters from a given string.

Sample Solution:

Python Code:

``````def no_consecutive_letters (txt):
return txt[0] + ''.join(txt[i] for i in range(1,len(txt)) if txt[i] != txt[i-1])

print(no_consecutive_letters("PPYYYTTHON"))
print(no_consecutive_letters("PPyyythonnn"))
print(no_consecutive_letters("Java"))
print(no_consecutive_letters("PPPHHHPPP"))
``````

Sample Output:

```PYTHON
Python
Java
PHP
```

Pictorial Presentation:

Flowchart:

Python Code Editor:

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## Python: Tips of the Day

What is the difference between Python's list methods append and extend?

append: Appends object at the end.

```x = [1, 2, 3]
x.append([4, 5])
print (x)
```

Output:

```[1, 2, 3, [4, 5]]
```

extend: Extends list by appending elements from the iterable.

```x = [1, 2, 3]
x.extend([4, 5])
print (x)
```

Output:

```[1, 2, 3, 4, 5]
```

Ref: https://bit.ly/2AZ6ZFq