🚀 *Gen AI Engineer (Production Focused)* 
1. replace() Method
Purpose: Replaces occurrences of a substring with another substring.
Syntax:
python
string.replace(old, new[, count])
old: Substring to replace.new: Substring to replace with.count(optional): Maximum number of replacements (default: all).
Examples:
Example 1: Basic Replacement
python
text = "Hello World"
new_text = text.replace("World", "Python")
print(new_text) # Output: "Hello Python"
Example 2: Limiting Replacements (count)
python
text = "apple apple apple"
new_text = text.replace("apple", "orange", 2)
print(new_text) # Output: "orange orange apple"
2. join() Method
Purpose: Joins an iterable (list, tuple, etc.) of strings into a single string using a separator.
Syntax:
python
separator.join(iterable)
iterable: Must contain strings (e.g.,list,tuple).
Examples:
Example 1: Joining a List with a Space
python
words = ["Python", "is", "awesome"] sentence = " ".join(words) print(sentence) # Output: "Python is awesome"
Example 2: Joining with a Comma
python
fruits = ["apple", "banana", "cherry"] csv = ",".join(fruits) print(csv) # Output: "apple,banana,cherry"
3. split() Method
Purpose: Splits a string into a list based on a delimiter.
Syntax:
python
string.split(sep=None, maxsplit=-1)
sep: Delimiter (default: whitespace).maxsplit: Maximum splits (default: all).
Examples:
Example 1: Splitting by Comma
python
text = "apple,banana,cherry"
fruits = text.split(",")
print(fruits) # Output: ['apple', 'banana', 'cherry']
Example 2: Limiting Splits (maxsplit)
python
text = "one two three four"
parts = text.split(" ", 2)
print(parts) # Output: ['one', 'two', 'three four']
4. rsplit() Method
Purpose: Similar to split(), but splits from the right (end of string).
Syntax:
python
string.rsplit(sep=None, maxsplit=-1)
sep: Delimiter (default: whitespace).maxsplit: Maximum splits (default: all).
Examples:
Example 1: Basic rsplit()
python
text = "apple,banana,cherry"
fruits = text.rsplit(",")
print(fruits) # Output: ['apple', 'banana', 'cherry'] (same as split)
Example 2: Limiting Splits from the Right
python
text = "one two three four"
parts = text.rsplit(" ", 2)
print(parts) # Output: ['one two', 'three', 'four']
5. splitlines() Method
Purpose: Splits a string at line breaks (\n, \r\n, etc.).
Syntax:
python
string.splitlines([keepends=False])
keepends: IfTrue, keeps line breaks (default:False).
Examples:
Example 1: Basic splitlines()
python
text = "Line 1\nLine 2\r\nLine 3" lines = text.splitlines() print(lines) # Output: ['Line 1', 'Line 2', 'Line 3']
Example 2: Keeping Line Breaks (keepends=True)
python
text = "Hello\nWorld" lines = text.splitlines(keepends=True) print(lines) # Output: ['Hello\n', 'World']
Summary Table
| Method | Purpose | Example |
|---|---|---|
replace() | Replace substrings | "abc".replace("a", "x") → "xbc" |
join() | Combine strings with a separator | ",".join(["a", "b"]) → "a,b" |
split() | Split string by delimiter (left-to-right) | "a,b,c".split(",") → ["a", "b", "c"] |
rsplit() | Split string by delimiter (right-to-left) | "a b c".rsplit(" ", 1) → ["a b", "c"] |
splitlines() | Split by line breaks | "a\nb".splitlines() → ["a", "b"] |
These methods are essential for string manipulation in Python. Let me know if you need further clarification! 🚀