Python Conditional_Statements_and_Functions
Download as PPTX, PDF0 likes2 views
Python Conditional_Statements_and_Functions
Python Conditional_Statements_and_Functions
- 1. Learning Objectives By the end of this lesson, you will be able to: Describe expressions Illustrate conditional statements Explain loops Describe functions
- 2. Conditional Statements and Functions
- 3. Conditional Expressions Conditional expressions are used for comparison. Conditional statements supported by Python are: Equal a==b Not equal a!=b Less than a<b Less than or equal a<=b Greater than a>b Greater than or equal a>=b
- 4. Membership Expressions Membership expressions are used to validate the membership of a value. It tests for membership in a sequence, such as strings, lists, or tuples. The different membership expressions in Python are: Expression: ▪ Checks for equality ▪ Compares members
- 6. if, elif, else Conditional statements execute a group of statements only based on some condition. In Python, if ,elif, and else are the conditional keyword statements in use. if: Executes a set of statements only if the condition is true otherwise, statement is skipped. Condition Indentation matters
- 7. if, elif, else elif: elif or else if is to check multiple conditions. else: If the condition is not true under if or elif, then the code jumps to else condition. Jumps to else
- 8. Loops
- 9. for Loop Loops execute a group of statements as long as a condition is True. Python has two basic loops: for loop and while loop. for loop: This is also called iterative loop in Python. For loops can iterate over a sequence of numbers using the "range" and "xrange" functions. Range function to set sequence limits for iteration
- 10. Sequence Iteration Using for Loop String iteration using for loop
- 11. List iteration using for loop Tuple iteration using for loop Sequence IterationUsingfor Loop
- 12. dictionary iteration using for loop Sets iteration using for loop Sequence IterationUsingfor Loop
- 14. while Loop while loop: while loops execute a set of statements as long as a condition is true.
- 15. Functions
- 16. Functions A function is a block of code which only runs when it is called. Defining function Passing variables Function Call
- 17. Functions A return statement ends the execution of the function call and returns the result. It is the value of the expression following the return keyword to the caller.
- 18. In-Built Functions in Python Python has a large library of in-built functions. Some of them are discussed here. eval(): It evaluates the passed string as a Python expression and returns the result. lamba(): helps to create one-line functions in Python.
- 19. In-Built Functions in Python map() function returns a list of results after applying the given function to each item of a given iterable. • map(fun, iter) : Syntax • fun : It is a function to which map passes each element of given iterable. • iter : It is an iterable which is to be mapped. • You can pass one or more iterable to the map() function.
- 20. In-Built Functions in Python round() function rounds a number to give precision in decimal digits. If the number of decimal places has not been specified, the decimal number is rounded off to a whole number. Rounds number to 2 decimal places
- 21. In-Built Functions in Python all() function returns false if any one of the elements of the iterable is zero and true if all the elements of the iterable are nonzero. Returns True as non-zero sequence Returns False as zero is present in sequence
- 22. Knowledge Check
- 23. “a” is “apple”, will give output as: a. a b. False c. True d. Will show error Knowledge Check 1
- 24. “a” is “apple”, will give output as: a. a b. False c. True d. Will show error Knowledge Check 1 The correct answer is b “is “ is a membership operator in Python which returns ‘True’ for exact value.
- 25. a. b. Knowledge Check 2 Let a=“XY“ then the expression: for i in a: print(a,end="t") will give output as: X Y XY X Y c. X Y d. XY XY
- 26. a. b. Let a=“XY“ then the expression: for i in a: print(a,end="t") will give output as: X Y XY X Y c. X Y d. XY XY Knowledge Check 2 The correct answer is d for loop will iterate the sequence two times and ends each iteration with a tab.
- 27. Knowledge Check 3 eval() function evaluates: a. Expression passed as a string b. Expression only if it contains digits c. Expression containing digits and strings d. Expression to sort the strings
- 28. eval() function evaluates: Knowledge Check 3 The correct answer is a eval() evaluates the expression passed as a string and returns the result. a. Expression passed as a string b. Expression only if it contains digits c. Expression containing digits and strings d. Expression to sort the strings
- 29. The output of: max(False,-4,-1) a. -1 b. True c. False d. -4 Knowledge Check 4
- 30. The output of: max(False,-4,-1) a. -1 b. True c. False d. -4 Knowledge Check 4 The correct answer is c The function max() is being used to find the maximum value from -4, -1, and false. Since, false amounts to the value zero, Hence, False is the right answer.
- 31. Key Takeaways Conditional statements use conditional operators. For loop is an iterative loop in Python. Functions limit the use of loops.