List & Lambda

Let us Review Python a bit and look at List & Lambda Function!

Python is the easiest popular programming language. Anything and everything you can do with python! Everyone knows about Google. Google uses Python extensively.

We learn some fundamentals by examples.

Ex.1 Print

Code	result
print("Hello, Friends!")	Hello, Friends!

Types and functions

Python automatically recognizes the types of data. Here are a few examples:

Number – Integer, Float, Complex: 3, 3.0, ‘3+j’
Character Strings: ‘ODL’, ‘AMET’
List of Objects: [10, 20, 30, 40], [‘Male’, ‘Female’]
In addition, Python has special datum meaning nothing: None

Python is rich in libraries, built-in-function. Now let us learn about variables

Ex.2 Add two constants

Code	Result
print(5+5)	10

Ex. 3 Add variables

Code	Result
X,Y = 5,5
print(X+Y)	10
X,Y = 5,’FIVE’ print(X+Y)	SyntaxError: invalid character '’' (U+2019)

 Note multiple assignments in a single statement

Ex. 4 Add string variables

Code	Result
X,Y = ‘5’,’5’
print(X+Y)	55
X,Y = ‘AMET’,’UNIVERSITY’
print(X+Y)	AMET University

Let us print some useful Multiplication Table

Ex 5. For loop with range -

Multiplication Table for 5: Here we use for loop with simple syntax as shown:

Code	Result
for x in range(1,11):      print(x*5)	5 10 15 20 25 30 35 40 45 50
for x in range(1,11,2):     print(x*5)   #Note range function (start,stop,step)	1 3 5 7 9
for x in range(1,10):  txt = '{} * {} = {}'      print(txt.format(x,5,x*5))   #note simple formatting	1 * 5 = 05 2 * 5 = 10 3 * 5 = 15 4 * 5 = 20 5 * 5 = 25 6 * 5 = 30 7 * 5 = 35 8 * 5 = 40 9 * 5 = 45

 

For repetitive steps, we used for loop. See the syntax range. Note range (start, stop, step)

The start is inclusive and the stop is excluded with the increment step.

 Ex 6. For Loop iteration

code	result
for x in "AMET":       print(x)	A M E T
for x in ['marine’, ‘nautical science']:       print(x)	marine nautical science
Let us check how PVM (Python Virtual Machine) handles internally through some simulator   Click This Link Python Tutor - Visualize Python and paste the above code in the space given and see the steps forward.

 Ex 7. Introspection to Python variable types
#Ex 7 basic and collection variables
var_i = 5
var_f = 5.0
var_str = "AMET"
print(type(var_i))
print(type(var_f))
print(type(var_str))
print(25*'-','Collection Variables')

# Numeric collection variables
var_list = [1,2,3]
var_tuple = ("one",  "two", "three")
var_set = {1,2,3}
var_dict = {"1":"one", "2": "Two", "3":"Three"}
print(type(var_list))
print(type(var_tuple))
print(type(var_set))
print(type(var_dict))

#

Result: 

<class 'int'>
<class 'float'>
<class 'str'>
------------------------- Collection Variables
<class 'list'>
<class 'tuple'>
<class 'set'>
<class 'dict'>

Happy Learning Lambda🎨😊