Python - Create a string made of the first and last two characters from a given string

This tutorial demonstrates how to create a new string using the first and last two characters from a given string through string slicing. This technique is useful for data processing, text formatting, and extracting key information from strings.

Algorithm

• Start with the given string

• Use slicing [:2] to extract the first two characters

• Use negative slicing [-2:] to extract the last two characters

• Concatenate both parts to form the new string

Basic Example

Here's the simple approach to create a new string from first and last two characters ?

given_string = "TechCrunch"
new_string = given_string[:2] + given_string[-2:]
print("Original:", given_string)
print("New String:", new_string)

Original: TechCrunch
New String: Tech

More Examples

Let's see how this works with different strings ?

# Example 1
string1 = "Python"
result1 = string1[:2] + string1[-2:]
print(f"'{string1}' becomes '{result1}'")

# Example 2  
string2 = "FastAPI"
result2 = string2[:2] + string2[-2:]
print(f"'{string2}' becomes '{result2}'")

# Example 3
string3 = "Programming"
result3 = string3[:2] + string3[-2:]
print(f"'{string3}' becomes '{result3}'")

'Python' becomes 'Pyon'
'FastAPI' becomes 'FaPI'
'Programming' becomes 'Prng'

Understanding String Slicing

String slicing uses square bracket notation with start and end indices separated by a colon ?

text = "Hello, Python!"

# Basic slicing
print("Characters 2-7:", text[2:7])

# First two characters
print("First two:", text[:2])

# Last two characters  
print("Last two:", text[-2:])

# Reverse string
print("Reversed:", text[::-1])

Characters 2-7: llo, 
First two: He
Last two: n!
Reversed: !nohtyP ,olleH

Step-by-Step Breakdown

# Given string
original = "FastAPI"

# Step 1: Extract first two characters
first_two = original[:2]
print("First two characters:", first_two)

# Step 2: Extract last two characters
last_two = original[-2:]
print("Last two characters:", last_two)

# Step 3: Combine them
result = first_two + last_two
print("Combined result:", result)

First two characters: Fa
Last two characters: PI
Combined result: FaPI

Function Implementation

You can create a reusable function for this operation ?

def first_last_two(string):
    """Create new string from first and last two characters"""
    if len(string) < 4:
        return string  # Return original if too short
    return string[:2] + string[-2:]

# Test the function
test_strings = ["Python", "AI", "Programming", "Code"]

for text in test_strings:
    result = first_last_two(text)
    print(f"'{text}' ? '{result}'")

'Python' ? 'Pyon'
'AI' ? 'AI'
'Programming' ? 'Prng'
'Code' ? 'Code'

Common Use Cases

Conclusion

String slicing with [:2] and [-2:] provides an efficient way to extract first and last characters. This technique is valuable for text processing, data manipulation, and creating abbreviated forms of strings in Python applications.