String Data Type in Python

Strings in Python are identified as a contiguous set of characters represented in quotation marks. Python allows for either pairs of single or double quotes. Subsets of strings can be taken using the slice operator [ ] and [:] with indexes starting at 0 in the beginning of the string and working their way from -1 at the end.

String Creation

You can create strings using single quotes, double quotes, or triple quotes for multi-line strings ?

# Different ways to create strings
single_quote = 'Hello World!'
double_quote = "Hello World!"
multi_line = """This is a
multi-line string"""

print(single_quote)
print(double_quote)
print(multi_line)

Hello World!
Hello World!
This is a
multi-line string

String Indexing and Slicing

Strings support indexing and slicing operations. Positive indices start from 0, while negative indices start from -1 ?

text = 'Hello World!'

print(text)          # Prints complete string
print(text[0])       # Prints first character
print(text[2:5])     # Prints characters from index 2 to 4
print(text[2:])      # Prints string starting from 3rd character
print(text[-1])      # Prints last character
print(text[-6:-1])   # Prints characters using negative indexing

Hello World!
H
llo
llo World!
!
World

String Operations

The plus (+) sign is the string concatenation operator and the asterisk (*) is the repetition operator ?

text = 'Hello World!'

print(text * 2)           # Prints string two times
print(text + " TEST")     # Prints concatenated string
print("Python " * 3)     # Repetition with different string

Hello World!Hello World!
Hello World! TEST
Python Python Python 

String Properties

Strings in Python are immutable, meaning you cannot change individual characters. You can check string length and membership ?

text = 'Hello World!'

print(len(text))          # String length
print('Hello' in text)    # Membership test
print('Python' in text)   # Membership test
print(text.upper())       # Convert to uppercase
print(text.lower())       # Convert to lowercase

12
True
False
HELLO WORLD!
hello world!

Escape Characters

Use backslash \ to include special characters in strings ?

# Examples of escape characters
print("She said, "Hello!"")     # Double quotes inside string
print('It's a beautiful day')    # Single quote inside string
print("Line 1\nLine 2")          # New line
print("Column 1\tColumn 2")      # Tab character

She said, "Hello!"
It's a beautiful day
Line 1
Line 2
Column 1	Column 2

Conclusion

Python strings are immutable sequences that support indexing, slicing, concatenation, and repetition. Use single or double quotes for simple strings, and triple quotes for multi-line strings. Remember that string indexing starts at 0.