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Python Regex: The 5 Exclusive Examples

 Regular expressions (regex) are powerful tools for pattern matching and text manipulation in Python. Here are five Python regex examples with explanations: 01 Matching a Simple Pattern import re text = "Hello, World!" pattern = r"Hello" result = re.search(pattern, text) if result:     print("Pattern found:", result.group()) Output: Output: Pattern found: Hello This example searches for the pattern "Hello" in the text and prints it when found. 02 Matching Multiple Patterns import re text = "The quick brown fox jumps over the lazy dog." patterns = [r"fox", r"dog"] for pattern in patterns:     if re.search(pattern, text):         print(f"Pattern '{pattern}' found.") Output: Pattern 'fox' found. Pattern 'dog' found. It searches for both "fox" and "dog" patterns in the text and prints when they are found. 03 Matching Any Digit   import re text = "The price of the

These Tips Helpful to Remove Python List and Dictionary Duplicates

In this post, I have shared top ideas to remove duplicates from the list. Those are with Append and Dictionary.

Python: How to Remove Duplicates From List

1. How to Remove Duplicates with Append

# Here is a list with duplicates

list_with_duplicates = [1,2,3,12,1,2,3,4,5,6,1,2,3,7,8,9]

It is simple if you follow the first-approach - brute force approach:

list_without_duplicates = []

for pd in list_with_duplicates:
  if pd not in list_without_duplicates:


[1, 2, 3, 12, 4, 5, 6, 7, 8, 9]

This method has performance issues when the list is bigger in size. 


Idea 1:  Remove Duplicates Using Append.

2. How to Remove Duplicates with Dictionary

# Here is you can convert a list to a dictionary

dict_without_duplicates = dict(zip(list_with_duplicates, list_with_duplicates))


{1: 1, 2: 2, 3: 3, 12: 12, 4: 4, 5: 5, 6: 6, 7: 7, 8: 8, 9: 9}


Idea 2: Remove Duplicates Using Dictionary.

Once again, this works and has the advantage of taking less space than duplicating the entire list. 

Notes: Of course, we still need to convert it back to a list when we did, which will be somewhat painful since we must extract the keys and add them to a list.


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