﻿ Python: Remove all consecutive duplicates of a given string - w3resource

# Python: Remove all consecutive duplicates of a given string

## Python String: Exercise-67 with Solution

Write a Python program to remove all consecutive duplicates of a given string.

Sample Solution - 1:

Python Code:

``````from itertools import groupby
def remove_all_consecutive(str1):
result_str = []
for (key,group) in groupby(str1):
result_str.append(key)

return ''.join(result_str)

str1 = 'xxxxxyyyyy'
print("Original string:" + str1)
print("After removing consecutive duplicates: " + str1)
print(remove_all_consecutive(str1))
```
```

Sample Output:

```Original string:xxxxxyyyyy
After removing consecutive duplicates: xxxxxyyyyy
xy
```

Pictorial Presentation:

Flowchart:

## Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:

Sample Solution - 2:

Python Code:

``````import itertools
def remove_consecutive_duplicates(s1):
return (''.join(i for i, _ in itertools.groupby(s1)))

s1= "aabcdaee"
print("Original String: ",s1)
print("\nRemoving all consecutive duplicates:")
print(remove_consecutive_duplicates(s1))
```
```

Sample Output:

```Original String:  aabcdaee

Removing all consecutive duplicates:
abcdae
```

Pictorial Presentation:

Flowchart:

Python Code Editor:

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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