To start coding in C, you need a text editor and a C compiler installed on your computer. There are several options for text editors (e.g., Visual Studio Code, Sublime Text, Notepad++) and C compilers (e.g., GCC for Linux, MinGW for Windows).

C programming language was developed by Dennis Ritchie at Bell Labs in the early 1970s. It has since become one of the most widely used and influential programming languages due to its simplicity, efficiency, and portability.

In a comprehensive C tutorial, you would learn everything you need to know to start programming in the C programming language. The tutorial would cover various concepts, from the basic building blocks to more advanced topics. Here's an outline of what you would typically learn in a full C tutorial:

Introduction to C:

History and background of the C language
Setting up a C development environment
Writing your first "Hello, World!" program
Basic C Syntax:

Data types and variables
Constants and literals
Operators and expressions
Input and output functions (printf and scanf)
Control Structures:

Conditional statements (if-else, switch-case)
Looping structures (for, while, do-while)
Break and continue statements
Functions and Scope:

Declaring and defining functions
Function arguments and return values
Function prototypes
Global and local scope
Arrays and Strings:

Declaring and initializing arrays
Accessing array elements
Multi-dimensional arrays
Working with strings
Pointers:

Understanding pointers and memory addresses
Pointer arithmetic
Passing pointers to functions
Dynamic memory allocation (malloc, free)
Structures and Unions:

Defining and using structures
Nested structures
Unions and their purpose
File Handling:

Reading and writing files
Text and binary files
File pointers and streams
Preprocessor Directives:

#define, #include, and other preprocessor directives
Conditional compilation (#ifdef, #ifndef, #endif)
Advanced C Concepts:

Enumerations
Typedef
Bit manipulation
Command-line arguments
Error Handling:

Handling errors and exceptions
Error codes and errno
C Standard Library Functions:

Overview of standard C library functions
String manipulation (strcpy, strcat, etc.)
Mathematical functions (sqrt, pow, etc.)
Memory functions (memcpy, memset, etc.)
Header Files and Libraries:

Creating and using header files
Linking external libraries
Debugging and Optimization:

Debugging techniques and tools (gdb, valgrind)
Code optimization tips
Best Practices and Coding Style:

Writing clean and maintainable code
C coding conventions and style guides
Throughout the tutorial, you would also work on coding exercises and projects to apply the concepts you've learned. By the end of the C tutorial, you would have a solid understanding of C programming fundamentals and be ready to tackle more complex projects and delve into more specialized areas of C programming.

Python 3 introduced several backward-incompatible changes compared to Python 2. One significant difference is the handling of print and input, as shown in examples 1 and 5 above. Additionally, various standard library modules and syntax changes may cause code written in Python 2 to break in Python 3. It's essential to carefully review and update Python 2 code to be compatible with Python 3.

import asyncio

async def async_example():
    print("Start")
    await asyncio.sleep(2)  # Asynchronous sleep for 2 seconds
    print("End")

# Create an event loop and run the async function
asyncio.run(async_example())

def greet(name, *, prefix="Hello"):
    print(prefix + ", " + name)

greet("John", prefix="Hi")  # Output: Hi, John

def add_numbers(a: int, b: int) -> int:
    return a + b

result = add_numbers(5, 10)
print(result)  # Output: 15

my_dict = {'a': 1, 'b': 2, 'c': 3}

# Dictionary view for keys
keys_view = my_dict.keys()
print(keys_view)  # Output: dict_keys(['a', 'b', 'c'])

# Dictionary view for values
values_view = my_dict.values()
print(values_view)  # Output: dict_values([1, 2, 3])

# Dictionary view for items (key-value pairs)
items_view = my_dict.items()
print(items_view)  # Output: dict_items([('a', 1), ('b', 2), ('c', 3)])

name = "John"
age = 30
print("My name is {} and I am {} years old.".format(name, age))

# Python 2 syntax for print
# print "Hello, World!"

# Python 3 syntax for print
print("Hello, World!")