From c9d2cc98e5c5681d964bb7b5ef984dba2cc2d258 Mon Sep 17 00:00:00 2001
From: Jogesh Ghadai <jogesh6895@gmail.com>
Date: Wed, 5 Mar 2025 22:44:31 +0530
Subject: [PATCH] Update README.md to add Walrus Operator
Added Walrus Operator with explanation and examples.
---
README.md | 82 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 82 insertions(+)
diff --git a/README.md b/README.md
index b4259e5..4efad0c 100644
--- a/README.md
+++ b/README.md
@@ -754,6 +754,88 @@ head, *body, tail = <coll.> # Head or tail can be omitted.
```
+Walrus Operator
+---------------
+**The Walrus Operator (:=) is a new addition to Python 3.8 and higher.
+ Walrus Operator allows you to assign a value to a variable within an expression.
+ This can be useful when you need to use a value multiple times in a loop, but don’t want to repeat the calculation.**
+
+### Walrus Operator with 'while' loop:
+```python
+def print_nums(numbers):
+ while (n := len(numbers)) > 0:
+ print(numbers.pop())
+```
+
+```python
+>>> numbers = [1, 2, 3, 4]
+>>> print_nums(numbers)
+4
+3
+2
+1
+```
+
+### Walrus Operator with 'if' statements:
+```python
+def check_name(data):
+ if name := data.get("name"):
+ print(f'Found name: "{name}"')
+```
+
+```python
+>>> data = {"userId": 1, "name": "Jerry", "age": 20}
+>>> check_name(data)
+Found name: "Jerry"
+```
+
+### Walrus Operator VS Equivalent assignment operation:
+### Example-1:
+**Walrus Operator:**
+```python
+data = [
+ {"userId": 1, "name": "Jack", "age": 20},
+ {"userId": 1, "name": "John", "age": 24}
+]
+
+for entry in sample_data:
+ if name := entry.get("name"):
+ print(f'Found name: "{name}"')
+```
+
+**Equivalent assignment operation without Walrus Operator:**
+```python
+data = [
+ {"userId": 1, "name": "Jack", "age": 20},
+ {"userId": 1, "name": "John", "age": 24}
+]
+
+for entry in sample_data:
+ name = entry.get("name")
+ if name:
+ print(f'Found name: "{name}"')
+```
+### Example-2:
+**Walrus Operator:**
+```python
+fruits = list()
+
+while (fruit := input("What fruit do you like:= ")) != "quit":
+ fruits.append(fruit)
+```
+
+**Equivalent assignment operation without Walrus Operator:**
+```python
+fruits = list()
+
+while True:
+ fruit = input("What fruit do you like?: ")
+ if fruit == "quit":
+ break
+ fruits.append(fruit)
+```
+
+
Inline
------
### Lambda