Here is a simple script that reads a JSON file and sends HTTP requests to URLs defined in that JSON file. It covers syntax for functions, variables, classes, loops, imports, class constructors, class methods, and class properties.

```python
# Import syntax example: Import an entire libraries
import json, sys
# Import syntax example: Import specific functions from a library
from requests import get, post

# Class syntax
class MyClass:

    # Class constructor
    def __init__(self, config_file_path):
        # local variable syntax: a variable that is only available the current function
        config = self.read_config(config_file_path)
        # Class property syntax: set a property on the class instance from a local variable
        self.get_urls = config["get_urls"]
        self.post_urls = config["post_urls"]

    # Method syntax: a class method that returns a dictionary from a JSON file
    def read_config(config_file_path: str) -> dict:
        with open(config_file_path, "rb") as f:
            return json.load(f)

# Function syntax: a function that is called when the script is run and takes a list of arguments
def main(args):
    # Class instantiation syntax: create an instance of a class and pass in a variable to the constructor
    my_class = MyClass(args[1])

    # For loop syntax: loop over a list of URLs
    for url in my_class.get_urls:
        # Function syntax: call a function and pass in a variable
        response = get(url)
        print(response.text)

    # Variable syntax: a simple counter variable to be used in a while loop
    i = 0
    # While loop syntax: loop over a list of URLs
    while i < len(my_class.post_urls):
        # Function syntax: call a function and pass in a variable
        response = post(my_class.post_urls[i], data={"foo": "bar"})
        print(response.text)
        # Increment syntax: increment a variable
        i += 1

# Function syntax: call a function when the script is run
if __name__ == "__main__":
    # Function syntax: call a function and pass in a variable
    main(sys.argv)
```
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