Added Lambda Functions and Ternary Conditionals Operators

wilfredinni · wilfredinni · commit 86105e2f8025 · 2018-02-05T21:32:05.000-03:00
diff --git a/README.md b/README.md
@@ -4,7 +4,7 @@ Basic cheatsheet for Python.
 
 ## Credits
 
-Based on the book writted by Al Sweigart, [Automate the Boring Stuff with Python](https://automatetheboringstuff.com/) under the [Creative Commons license](https://creativecommons.org/licenses/by-nc-sa/3.0/).
+Mostly based on the book writted by Al Sweigart, [Automate the Boring Stuff with Python](https://automatetheboringstuff.com/) under the [Creative Commons license](https://creativecommons.org/licenses/by-nc-sa/3.0/) and many other sources.
 
 ## PDF Version
 
@@ -129,4 +129,6 @@ Based on the book writted by Al Sweigart, [Automate the Boring Stuff with Python
   - Disabling Logging
   - Logging to a File
 - Virtual Environment
-  - Windows
+  - Windows
+- Lambda Functions
+- One line if statement in Python (ternary conditional operator)
diff --git a/python_cheat_sheet.md b/python_cheat_sheet.md
@@ -121,6 +121,8 @@
         - [Logging to a File](#logging-to-a-file)
     - [Virtual Environment](#virtual-environment)
         - [Windows](#windows)
+    - [Lambda Functions](#lambda-functions)
+    - [One line if statement in Python (ternary conditional operator)](#one-line-if-statement-in-python-ternary-conditional-operator)
 
 ## Python Basics
 
@@ -2475,4 +2477,82 @@ Usage:
 
     Open up the command prompt and type ‘workon HelloWold’ to activate the environment and move into your root project folder:
 
-        workon HelloWold
+        workon HelloWold
+
+## Lambda Functions
+
+This function:
+
+```python
+>>> def add(x, y):
+        return x + y
+
+>>> add(5, 3)
+8
+```
+
+Is equivalente to the *lambda* function:
+
+```python
+>>> add = lambda x, y: x + y
+>>> add(5, 3)
+8
+```
+
+It's not even need to bind it to a name like add before:
+
+```python
+>>> (lambda x, y: x + y)(5, 3)
+8
+```
+
+Like regular nested functions, lambdas also work as lexical closures:
+
+```python
+>>> def make_adder(n):
+        return lambda x: x + n
+
+>>> plus_3 = make_adder(3)
+>>> plus_5 = make_adder(5)
+
+>>> plus_3(4)
+7
+>>> plus_5(4)
+9
+```
+
+## One line if statement in Python (ternary conditional operator)
+
+Many programming languages have a ternary operator, which define a conditional expression. The most common usage is to make a terse simple conditional assignment statement. In other words, it offers one-line code to evaluate the first expression if the condition is true, otherwise it evaluates the second expression. 
+
+    <expression1> if <condition> else <expression2>
+
+Example:
+
+```python
+>>> age = 15
+
+>>> print('kid' if age < 18 else 'adult')
+kid
+```
+
+Ternary operators can be changed:
+
+```python
+>>> age = 15
+
+>>> print('kid' if age < 13 else 'teenager' if age < 18 else 'adult')
+teenager
+```
+
+The code above is equivalent to:
+
+```python
+if age < 18:
+    if age < 12:
+        print('kid')
+    else:
+        print('teenager')
+else:
+    print('adult')
+```
diff --git a/python_cheat_sheet.pdf b/python_cheat_sheet.pdf
