Introduction to python programming [part 1]
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The document is a comprehensive introduction to Python programming, covering topics such as installation, memory management, control structures, data types, functions, and modules. It includes syntax examples, exercises, and comparisons with other programming languages. The content is structured for learners, providing practical snippets and exercises to reinforce understanding.
![40
String
Introduction To Python Programming /in/pcakhilnadh
○ Str_object.split(separator,maxsplit)
“ab cd ef”.split() -> [‘ab’, ‘cd’, ‘ef’]
○ input() -> To read input from user
a = input(“ Enter a String ” )
○ “joinString”.join(sequence)
“-”.join([‘a’, ‘b’ ,‘c’ ,‘d’]). -> a-b-c-d](https://image.slidesharecdn.com/introductiontopythonprogramming-181003173103-181113144403/85/Introduction-to-python-programming-part-1-40-320.jpg)
![42
List
○ Ordered and indexed collection of objects
○ Mutable
○ list(sequence) -> convert the objects into list
a=list(‘foo’) -> [‘f’, ‘o’, ‘o’]
○ List Indexing
Introduction To Python Programming /in/pcakhilnadh
Forward Indexing
Backward Indexing
a[0] -> 1
a[-1] ->5](https://image.slidesharecdn.com/introductiontopythonprogramming-181003173103-181113144403/85/Introduction-to-python-programming-part-1-42-320.jpg)
![43
List Slicing
○ listObject[ <start> : <end> : <step> ]
a[1:3] -> 2 3 (Everything from 1 to 3 excluding the 3rd position)
a[1:] -> 2 3 4 5 (Everything from 1 to end)
Introduction To Python Programming /in/pcakhilnadh
Exercise 7
Read string from user and store it in list .Sort and Reverse the list
and print the elements in the even position
Fill this code snippet and pull a request in GitHub](https://image.slidesharecdn.com/introductiontopythonprogramming-181003173103-181113144403/85/Introduction-to-python-programming-part-1-43-320.jpg)
![47
For Loops
○ Used for sequential traversal
○ Syntax
for iterator_variable in sequence:
statements(s)
○ It can be used to iterate over iterators and a range.
○ Sample Code Snippet
for i in range(10) :
print(i)
○ range(start, stop[, step])
Introduction To Python Programming /in/pcakhilnadh
It is sequence or List](https://image.slidesharecdn.com/introductiontopythonprogramming-181003173103-181113144403/85/Introduction-to-python-programming-part-1-47-320.jpg)
![52
Map Function
○ Expects a function object and any number of iterables like list, dictionary, etc. It
executes the function_object for each element in the sequence and returns a list of
the elements modified by the function object
○ Syntax
map( functionObject , iterables )
○ Example
map( square, [2,3,4,5] ) -> 4,9,16, 25
○ Add two list values
○ list_a = [1, 2, 3]
list_b = [10, 20, 30]
map(lambda x, y: x + y, list_a, list_b)
# Output: [11, 22, 33]
Introduction To Python Programming /in/pcakhilnadh](https://image.slidesharecdn.com/introductiontopythonprogramming-181003173103-181113144403/85/Introduction-to-python-programming-part-1-52-320.jpg)
Introduction to python programming [part 1]
- 7. Before We Get Started ○ https://goo.gl/6wcQKU OR ○ https://github.com/itzpc/Introduction-To-Python- Programming 7 Introduction To Python Programming /in/pcakhilnadh Fork the Repository
- 8. Contents ○ Introduction ○ Conditional Statements ○ Operators ○ Data Types ○ Iterative Statements ○ Functions ○ Modules ○ Conclusion 8 Introduction To Python Programming /in/pcakhilnadh
- 9. Introduction https://python.org 9 Introduction To Python Programming /in/pcakhilnadh Installing Python
- 10. Introduction ○ Linux $ sudo apt-get update $ sudo apt-get install python3 ○ Mac OS $ brew install python3 10 Introduction To Python Programming /in/pcakhilnadh Installing Python – Command Line
- 11. Introduction 11 Introduction To Python Programming /in/pcakhilnadh Python : Interpreted or Compiled ?
- 12. 12 Introduction To Python Programming /in/pcakhilnadh Python : Interpreted or Compiled ? Compiler Pgm.c a.out Interpreter Output
- 13. 13 Introduction To Python Programming /in/pcakhilnadh Output Python : Interpreted or Compiled ?
- 14. 14 According to Official Documentation of Python “ Python is considered as Interpreted Language ” It's worth noting that languages are not interpreted or compiled, but rather language implementations either interpret or compile code. Introduction To Python Programming /in/pcakhilnadh Python : Interpreted or Compiled ?
- 15. Introduction ○ From Shell ○ From File python3 filename.py 15 Introduction To Python Programming /in/pcakhilnadh Ways to Run a Py File
- 16. Introduction 16 Introduction To Python Programming /in/pcakhilnadh Introduction to Memory Management X=10 10 X X=10 Y=X 10 X Y 10 10 “ Everything in Python is an Object ” Other Prog Lang C/JAVA
- 17. 17 Introduction To Python Programming /in/pcakhilnadh Introduction to Memory Management X=11 Y X “ Python is Dynamically Typed Language ” 10 11 Z=10 Y X 10 11 Z What Happens X=11 ? Python Optimizes Memory
- 18. Introduction 18 Introduction To Python Programming /in/pcakhilnadh Comparison with other Languages
- 19. Introduction 19 Introduction To Python Programming /in/pcakhilnadh Sample Python File Syntax Function Can Pass Arguments Note the Space . Indentation – Technically ! NO semi colon ?
- 20. Conditional Statements ○ if statement ○ if else statement ○ Chained Conditional (~Switch) ○ Nested Conditional 20 Introduction To Python Programming /in/pcakhilnadh
- 21. 21 if statement if BOOLEAN EXPRESSION : STATEMENTS Syntax Note the Space . Indentation – Technically ! Note the colon NO semi colon ! Exercise 1 Run this code snippet . To Demonstrate working of if statement Introduction To Python Programming /in/pcakhilnadh
- 22. 22 if else statement if BOOLEAN EXPRESSION : STATEMENTS_1 else : STATEMENT_2 Syntax Exercise 2 Run this code snippet . To Demonstrate working of if else statement Introduction To Python Programming /in/pcakhilnadh
- 23. 23 Chained conditionals if EXPRESSION: STATEMENTS_A elif EXPRESSION: STATEMENTS_B else: STATEMENTS_C Syntax Exercise 3 Run this code snippet . To Demonstrate working of chained conditionals Introduction To Python Programming /in/pcakhilnadh
- 24. 24 Nested conditionals if Expression : STATEMENTS_A else: if Expression : STATEMENTS_B else: STATEMENTS_C Syntax Introduction To Python Programming /in/pcakhilnadh
- 25. Operators ○ Arithmetic Operators ○ Comparison Operators ○ Bitwise Operators ○ Logical Operators ○ Membership Operator 25 Introduction To Python Programming /in/pcakhilnadh
- 26. 26 Arithmetic Operator ○ Addition + ○ Subtraction - ○ Multiplication * ○ Division / ○ Modulus % ○ Exponent ** ○ Floor Division // Exercise 4 Make a Simple Calculator Program . Fill this code snippet and pull a request in GitHub Introduction To Python Programming /in/pcakhilnadh
- 27. 27 Comparision Operator ○ Equal to == ○ Not Equal to != ○ Greater Than > ○ Less Than < ○ Greater than Equal to >= ○ Less than Equal to <= Introduction To Python Programming /in/pcakhilnadh
- 28. 28 Logical Operator ○ Logical AND AND ○ Logical OR OR ○ Logical NOT NOT Introduction To Python Programming /in/pcakhilnadh Exercise 5 Let x be a two digit number. Print Grade according to the following condition x >90 print Eligible for Research . x between 70 and 90 print Distinction if X is exactly 75 and above print Eligible for Placement if X is less than 70 print Fail Fill this code snippet and pull a request in GitHub
- 29. 29 Bitwise Operator ○ Binary AND & ○ Binary OR | ○ Binary XOR ^ ○ Binary Complement ~ ○ Binary Left Shift << ○ Binary Right Shift >> Introduction To Python Programming /in/pcakhilnadh Exercise 6 Run this code snippet . To Demonstrate working of Bitwise Operator
- 30. 30 Membership Operator ○ in ○ not in ○ is ○ is not Introduction To Python Programming /in/pcakhilnadh
- 31. Data Types ○ None ○ Numbers ○ Sequences ○ Collection ○ Sets ○ File 31 Introduction To Python Programming /in/pcakhilnadh
- 32. 32 None ○ Denote lack of value a = None Introduction To Python Programming /in/pcakhilnadh
- 33. 33 Number ○ Boolean - immutable ○ Integers - immutable ○ Float - immutable ○ Long - immutable ○ Complex - immutable Introduction To Python Programming /in/pcakhilnadh
- 34. 34 Boolean ○ bool(expression) -> Convert the expression to Boolean value ○ bool(1) -> True ○ Following are considered False ○ False ○ None ○ Numeric Zero ○ Empty Sequences and Collections Introduction To Python Programming /in/pcakhilnadh
- 35. 35 Integers ○ int (number, base) -> Convert the string ‘number’ from ‘base’ to decimal value ○ base is optional if given ‘number’ must be of type <class string> ○ Python consider Integers as BigInt by default . ○ Can handle as many long integers as possible ○ a = int(70) Introduction To Python Programming /in/pcakhilnadh
- 36. 36 Float ○ Float (number) -> Convert the string or integer ‘number’ to float value ○ number can take ○ Sign. : ‘+’ or ‘-’ ○ Infinity : ‘inf’ or ‘Infinity’ ○ NaN : ‘nan’ ○ a =float(‘ 1e-003’) -> 0.001 Introduction To Python Programming /in/pcakhilnadh
- 37. 37 Complex ○ complex (real, imaginary) -> return complex number of form real + j imaginary ○ a = complex(1) -> 1+j 0 Introduction To Python Programming /in/pcakhilnadh
- 38. 38 Sequences ○ String - immutable ○ Tuple - immutable ○ List. - mutable Introduction To Python Programming /in/pcakhilnadh
- 39. 39 String Introduction To Python Programming /in/pcakhilnadh ○ Hold string type value ○ No char type in python ○ It also represent array of bytes (hold data from files) ○ a = str(object) -> Return a string containing a printable representation of an object
- 40. 40 String Introduction To Python Programming /in/pcakhilnadh ○ Str_object.split(separator,maxsplit) “ab cd ef”.split() -> [‘ab’, ‘cd’, ‘ef’] ○ input() -> To read input from user a = input(“ Enter a String ” ) ○ “joinString”.join(sequence) “-”.join([‘a’, ‘b’ ,‘c’ ,‘d’]). -> a-b-c-d
- 41. 41 Tuple Introduction To Python Programming /in/pcakhilnadh ○ Ordered and indexed collection of objects ○ Tuples of two or more items separated by comma ○ tuple(iterable). -> Convert an iterable into a tuple ○ Packing my_tuple=tuple(3,4,’dog’) ○ Unpacking a,b,c = my_tuple
- 42. 42 List ○ Ordered and indexed collection of objects ○ Mutable ○ list(sequence) -> convert the objects into list a=list(‘foo’) -> [‘f’, ‘o’, ‘o’] ○ List Indexing Introduction To Python Programming /in/pcakhilnadh Forward Indexing Backward Indexing a[0] -> 1 a[-1] ->5
- 43. 43 List Slicing ○ listObject[ <start> : <end> : <step> ] a[1:3] -> 2 3 (Everything from 1 to 3 excluding the 3rd position) a[1:] -> 2 3 4 5 (Everything from 1 to end) Introduction To Python Programming /in/pcakhilnadh Exercise 7 Read string from user and store it in list .Sort and Reverse the list and print the elements in the even position Fill this code snippet and pull a request in GitHub
- 44. Iterative Statements ○ For loop ○ While loop 44 Introduction To Python Programming /in/pcakhilnadh
- 45. 45 Collections ○ Dictionary ○ Set ○ Frozen Set Introduction To Python Programming /in/pcakhilnadh
- 46. 46 Dictionary ○ Mutable ○ Unordered Collection ○ Keys must be hashable and unique ○ List and Dict cannot act as keys ○ ~ Hash Table in other Languages ○ dict( iterable ) -> Returns a dictionary object ○ A= { 0: ‘a’,1: ‘b’, 2: ‘c’ } Introduction To Python Programming /in/pcakhilnadh
- 47. 47 For Loops ○ Used for sequential traversal ○ Syntax for iterator_variable in sequence: statements(s) ○ It can be used to iterate over iterators and a range. ○ Sample Code Snippet for i in range(10) : print(i) ○ range(start, stop[, step]) Introduction To Python Programming /in/pcakhilnadh It is sequence or List
- 48. 48 While Loop ○ Execute a block of statement as long as a given condition is true. ○ If condition is False . Come out of Loop ○ syntax while (condition) : statements ○ x = 0 while (x < 10) : print(x) x = x + 1 Introduction To Python Programming /in/pcakhilnadh
- 49. Functions 49 ○ Function is a group of related statements that perform a specific task. ○ Variables inside function has local scope ○ Syntax def function_name(parameters): statement(s) return ○ Function Call function_name(parameters) Introduction To Python Programming /in/pcakhilnadh Optional
- 50. 50 Functions ○ In Python, we can return multiple values from a function !! def square(x,y): return x**2, y**2 xsq, ysq = square(2,3) Introduction To Python Programming /in/pcakhilnadh Exercise 8 Read a number from user and find factorial using recursive function Fill this code snippet and pull a request in GitHub
- 51. 51 Lambda Function ○ The small anonymous function ○ Take ‘n’ number of arguments but only one return type ○ Syntax lambda arguments : expression ○ lambda function to add two numbers add = lambda x,y : x+y add(5,6) ○ s Introduction To Python Programming /in/pcakhilnadh
- 52. 52 Map Function ○ Expects a function object and any number of iterables like list, dictionary, etc. It executes the function_object for each element in the sequence and returns a list of the elements modified by the function object ○ Syntax map( functionObject , iterables ) ○ Example map( square, [2,3,4,5] ) -> 4,9,16, 25 ○ Add two list values ○ list_a = [1, 2, 3] list_b = [10, 20, 30] map(lambda x, y: x + y, list_a, list_b) # Output: [11, 22, 33] Introduction To Python Programming /in/pcakhilnadh
- 53. 53 Modules ○ A code library. ○ A file containing a set of functions you want to include in your application ○ To create a module just save the code you want in a file with the file extension .py ○ Example save this as mymodule.py def greeting(name): print("Hello, " + name) ○ import and use the functions import mymodule mymodule.greeting("Jonathan") ○ import math ○ Import numpy Introduction To Python Programming /in/pcakhilnadh
- 54. Conclusion 54 Introduction To Python Programming /in/pcakhilnadh
- 55. Thank You Questions ? 55 Introduction To Python Programming /in/pcakhilnadh [email protected] /pcakhilnadh