Python operators part3
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This document discusses membership and identity operators in Python. Membership operators like 'in' and 'not in' evaluate to True if a variable is or is not found in a specified sequence. Identity operators like 'is' and 'is not' evaluate to True if two variables point to the same object or not. The document also provides examples of using these operators and defines their behavior.
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Python decision making_loops_control statements part9Vishal Dutt The range() function in Python is used to generate sequences of numbers. It returns a sequence of integers from start to stop-1 by default or allowing for specification of the start, stop, and step values. Examples show using range() in for loops to print numbers from 0 to 5 with the default start of 0 and increment of 1, from 2 to 6 with a specified start of 2, and from 2 to 30 incrementing by 3. The document also provides examples of calculating a factorial using for and while loops with range().
List view4
List view4Vishal Dutt The document discusses Toasts in Android, which are popup messages that provide feedback to users without taking focus away from the current activity. It explains that Toasts are lightweight and non-interactive, and can display text for a predefined short or long duration. An example is provided using the makeText() method, which requires a Context, message string, and duration as parameters. The document also outlines how to specify toast duration and customize toast location on screen.
List view3
List view3Vishal Dutt The document discusses ListView and AdapterView in Android. It notes that ListView derives from AdapterView, which are views that use adapters. It lists subclasses of AdapterView like AdapterViewFlipper and GridView. It then focuses on ListView and how to add event handling through an onItemClickListener, providing an example of setting one on a ListView to react to clicks and display a Toast with the item position.
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Python decision making_loops_control statements part8Vishal Dutt The document discusses the break, continue, and pass statements in Python. It provides examples of how each statement can be used in for and while loops. The break statement terminates the current loop and continues execution after the loop. The continue statement skips the rest of the current loop iteration and continues to the next one. The pass statement is used when a statement is syntactically required but no operation needs to be performed.
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Python decision making_loops part6
Python decision making_loops part6Vishal Dutt 1. Decision making statements like if-else statements and nested if statements allow programmers to execute different code based on certain conditions being true or false.
2. A nested if statement is when an if statement is placed inside the true block of an outer if statement, allowing for more complex conditional logic.
3. The main difference between if-else and nested if statements is that if-else provides two execution paths based on a single condition, while nested if allows evaluating multiple conditions in sequence to determine the correct execution path.
List view2
List view2Vishal Dutt This document discusses using built-in layouts and ListView in Android. It provides code to populate a ListView with sample data using an ArrayAdapter. The ListView is defined in an XML layout file and populated in the activity code. Built-in layouts like simple_list_item_1 provide easy-to-use templates for common widgets like TextView and simplify ListView implementation.
List view1
List view1Vishal Dutt The document discusses the key components of a ListView in Android, including the ListView itself, list items, and data for each item. It explains that list items can contain simple or complex layouts. The data comes from adapters that act as intermediaries between the data source and ListView. Adapters fetch data, create layouts for each item, and return items to the ListView. Common data sources are arrays, content providers, and database cursors. The main adapter types are ArrayAdapter for arrays and SimpleCursorAdapter for content providers and cursors.
Python decision making part5
Python decision making part5Vishal Dutt This document discusses nested if statements in Python. It provides an example of using nested if/elif statements to check multiple conditions for a variable. The syntax shows that an if/elif/else construct can be placed inside another if/elif/else construct. A sample code is given to illustrate this, where an outer if checks if a variable is less than 200, and nested if/elif statements check for specific values of 100, 150, or less than 50.
Python decision making part4
Python decision making part4Vishal Dutt This document discusses decision making structures in Python, including if, if-else, and if-elif-else statements. It provides the syntax and examples of using each type of statement to evaluate conditions and execute code blocks based on whether the conditions evaluate to True or False. The if statement executes code if the expression is true, if-else adds an else block for when the expression is false, and if-elif-else allows checking multiple expressions and executing the block for the first one that is true.
Python operators part2
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