1.4 String basics

Strings are fundamental building blocks in Python, allowing you to work with text data. They're created using quotes, can be manipulated with various operations, and have properties like length that you can easily determine.

Understanding string basics is crucial for text processing in Python. You'll learn how to create, combine, and modify strings, as well as access individual characters and perform comparisons between different strings.

String Fundamentals

String creation with quotes

Top images from around the web for String creation with quotes

• 

  regex - Python - escaping double quotes using string.replace - Stack Overflow View original

  Is this image relevant?

• 

  syntax - What is the difference in Python print with single (') and double (") quotation marks ... View original

  Is this image relevant?

• 

  ide - Python Triple Quoted Strings in Visual Studio 2010 - Stack Overflow View original

  Is this image relevant?

• 

  regex - Python - escaping double quotes using string.replace - Stack Overflow View original

  Is this image relevant?

• 

  syntax - What is the difference in Python print with single (') and double (") quotation marks ... View original

  Is this image relevant?

1 of 3

Top images from around the web for String creation with quotes

• 

  regex - Python - escaping double quotes using string.replace - Stack Overflow View original

  Is this image relevant?

• 

  syntax - What is the difference in Python print with single (') and double (") quotation marks ... View original

  Is this image relevant?

• 

  ide - Python Triple Quoted Strings in Visual Studio 2010 - Stack Overflow View original

  Is this image relevant?

• 

  regex - Python - escaping double quotes using string.replace - Stack Overflow View original

  Is this image relevant?

• 

  syntax - What is the difference in Python print with single (') and double (") quotation marks ... View original

  Is this image relevant?

1 of 3

• Create strings by enclosing a sequence of characters in single quotes ('') or double quotes ("")
• Ensure the opening and closing quotation marks match to avoid syntax errors
• Include special characters in strings using escape sequences which start with a backslash ($$ followed by a character (\n for newline, \t for tab, \ for backslash, ' for single quote, " for double quote)
• Examples: 'Hello, world!', "This is a string", 'It's a beautiful day', "She said, "Hello!"", 'Line 1\nLine 2\tTabbed'

Length determination with len()

• Determine the number of characters in a string using the len() function which returns an integer value
• Include all characters in the length count, such as spaces and special characters
• Examples: len('Hello') returns 5, len('Hello, world!') returns 13, len('') returns 0 for an empty string

String concatenation with +

• Join two or more strings together using the + operator, creating a new string without modifying the original strings
• Overload the + operator for strings, causing it to behave differently than when used with numbers
• Convert non-string values to strings using str() before concatenating them with other strings
• Examples: 'Hello' + ', ' + 'world!' results in 'Hello, world!', 'a' + 'b' + 'c' results in 'abc', 'Number: ' + str(42) results in 'Number: 42'

String operations and representations

• Access individual characters in a string using indexing, where the first character is at index 0
• Perform various operations on strings using string methods, such as upper(), lower(), strip(), and split()
• Compare strings using comparison operators (==, !=, <, >, <=, >=) which use lexicographic ordering based on ASCII or Unicode character representations
• ASCII and Unicode are character encoding standards that assign numeric values to characters, allowing computers to represent and manipulate text