Python Examples

Python Syntax

1. Print “Hello World”
2. Comments in Python
3. Docstrings

Syntax Explained

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Python Variables

1. Create a variable
2. Output both text and a variable
3. Add a variable to another variable

Variables Explained

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Python Numbers

1. Verify the type of an object
2. Create integers
3. Create floating point numbers
4. Create scientific numbers with an “e” to indicate the power of 10
5. Create complex numbers

Numbers Explained

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Python Casting

1. Casting – Integers
2. Casting – Floats
3. Casting – Strings

Casting Explained

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1. Get the character at position 1 of a string
2. Substring. Get the characters from position 2 to position 5 (not included)
3. Remove whitespace from the beginning or at the end of a string
4. Return the length of a string
5. Convert a string to lower case
6. Convert a string to upper case
7. Replace a string with another string
8. Split a string into substrings

Strings Explained

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Python Operators

1. Addition operator
2. Subtraction operator
3. Multiplication operator
4. Division operator
5. Modulus operator
6. Assignment operator

Operators Explained

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Python Lists

1. Create a list
2. Access list items
3. Change the value of a list item
4. Loop through a list
5. Check if a list item exists
6. Get the length of a list
7. Add an item to the end of a list
8. Add an item at a specified index
9. Remove an item
10. Remove the last item
11. Remove an item at a specified index
12. Empty a list
13. Using the list() constructor to make a list

Lists Explained

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Python Tuples

1. Create a tuple
2. Access tuple items
3. Change tuple values
4. Loop through a tuple
5. Check if a tuple item exists
6. Get the length of a tuple
7. Delete a tuple
8. Using the tuple() constructor to create a tuple

Tuples Explained

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Python Sets

1. Create a set
2. Loop through a set
3. Check if an item exists
4. Add an item to a set
5. Add multiple items to a set
6. Get the length of a set
7. Remove an item in a set
8. Remove an item in a set by using the discard() method
9. Remove the last item in a set by using the pop() method
10. Empty a set
11. Delete a set
12. Using the set() constructor to create a set

Sets Explained

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Python Dictionaries

1. Create a dictionary
2. Access the items of a dictionary
3. Change the value of a specific item in a dictionary
4. Print all key names in a dictionary, one by one
5. Print all values in a dictionary, one by one
6. Using the values() function to return values of a dictionary
7. Loop through both keys an values, by using the items() function
8. Check if a key exists
9. Get the length of a dictionary
10. Add an item to a dictionary
11. Remove an item from a dictionary
12. Empty a dictionary
13. Using the dict() constructor to create a dictionary

Dictionaries Explained

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Python If … Else

1. The if statement
2. The elif statement
3. The else statement
4. Short hand if
5. Short hand if … else
6. The and keyword
7. The or keyword

If … Else Explained

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Python While Loop

1. The while loop
2. Using the break statement in a while loop
3. Using the continue statement in a while loop

While Loop Explained

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Python For Loop

1. The for loop
2. Loop through a string
3. Using the break statement in a for loop
4. Using the continue statement in a for loop
5. Using the range() function in a for loop
6. Else in for loop
7. Nested for loop

For Loop Explained

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Python Functions

1. Create and call a function
2. Function parameters
3. Default parameter value
4. Let a function return a value
5. Recursion

Functions Explained

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Python Lambda

1. A lambda function that adds 10 to the number passed in as an argument
2. A lambda function that multiplies argument a with argument b
3. A lambda function that sums argument a, b, and c

Lambda Explained

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Python Arrays

1. Create an array
2. Access the elements of an array
3. Change the value of an array element
4. Get the length of an array
5. Loop through all elements of an array
6. Add an element to an array
7. Remove an element from an array

Arrays Explained

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Python Classes and Objects

1. Create a class
2. Create an object
3. The __init__() Function
4. Create object methods
5. The self parameter
6. Modify object properties
7. Delete object properties
8. Delete an object

Classes/Objects Explained

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Python Iterators

1. Return an iterator from a tuple
2. Return an iterator from a string
3. Loop through an iterator
4. Create an iterator
5. Stop iteration

Iterators Explained

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Python Modules

1. Use a module
2. Variables in module
3. Re-naming a module
4. Built-in modules
5. Using the dir() function
6. Import from module

Modules Explained

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Python Dates

1. Import the datetime module and display the current date
2. Return the year and name of weekday
3. Create a date object
4. The strftime() Method

Dates Explained

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Python Math

1. Find the lowest and highest value in an iterable
2. Return the absolute value of a number
3. Return the value of x to the power of y (x^y)
4. Return the square root of a number
5. Round a number upwards and downwards to its nearest integer
6. Return the value of PI

Math Explained

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Python JSON

1. Convert from JSON to Python
2. Convert from Python to JSON
3. Convert Python objects into JSON strings
4. Convert a Python object containing all the legal data types
5. Use the indent parameter to define the numbers of indents
6. Use the separators parameter to change the default separator
7. Use the sort_keys parameter to specify if the result should be sorted or not

JSON Explained

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Python RegEx

1. Search a string to see if it starts with “The” and ends with “Spain”
2. Using the findall() function
3. Using the search() function
4. Using the split() function
5. Using the sub() function

RegEx Explained

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Python PIP

1. Using a package

PIP Explained

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Python Try Except

1. When an error occurs, print a message
2. Many exceptions
3. Use the else keyword to define a block of code to be executed if no errors were raised
4. Use the finally block to execute code regardless if the try block raises an error or not

Try Except Explained

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Python File Handling

1. Read a file
2. Read only parts of a file
3. Read one line of a file
4. Loop through the lines of a file to read the whole file, line by line

File Handling Explained

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Python MySQL

1. Create a connection to a database
2. Create a database in MySQL
3. Check if a database exist
4. Create a table
5. Check if a table exist
6. Create primary key when creating a table
7. Insert a record in a table
8. Insert multiple rows
9. Get inserted ID
10. Select all records from a table
11. Select only some of the columns in a table
12. Use the fetchone() method to fetch only one row in a table
13. Select with a filter
14. Wildcards characters
15. Prevent SQL injection
16. Sort the result of a table alphabetically
17. Sort the result in a descending order (reverse alphabetically)
18. Delete records from an existing table
19. Prevent SQL injection
20. Delete an existing table
21. Delete a table if it exist
22. Update existing records in a table
23. Prevent SQL injection
24. Limit the number of records returned from a query
25. Combine rows from two or more tables, based on a related column between them
26. LEFT JOIN
27. RIGHT JOIN

MySQL Explained

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Python MongoDB

1. Create a database
2. Check if a database exist
3. Create a collection
4. Check if a collection exist
5. Insert into collection
6. Return the id field
7. Insert multiple documents
8. Insert multiple documents with specified IDs
9. Find the first document in the selection
10. Find all documents in the selection
11. Find only some fields
12. Filter the result
13. Advanced query
14. Filter with regular expressions
15. Sort the result alphabetically
16. Sort the result descending (reverse alphabetically)
17. Delete document
18. Delete many documents
19. Delete all documents in a collection
20. Delete a collection
21. Update a document
22. Update many/all documents
23. Limit the result

MongoDB Explained