python) Passing function parameters to a function
def call(func):
for i in range(10):
func()
def print_hello():
print("hello")
call(print_hello)
This code snippet demonstrates a simple but powerful concept in Python: passing functions as arguments to other functions. Here's how it works:
### The `call` Function
- **Purpose**: Accepts a function (`func`) as its argument and calls that function 10 times within a loop.
- **Implementation**: It defines a loop that iterates 10 times using `for i in range(10):`. Within each iteration, it calls the passed-in function `func()` without any arguments.
### The `print_hello` Function
- **Purpose**: Prints the string `"hello"` to the console.
- **Implementation**: Contains a single `print` statement.
### Using `call` with `print_hello`
- **Execution**: The `call` function is called with `print_hello` as its argument: `call(print_hello)`. This results in `print_hello` being executed 10 times.
### Output
The output of running this code will be the word `"hello"` printed to the console 10 times, each on a new line:
```
hello
hello
hello
hello
hello
hello
hello
hello
hello
hello
```
### Key Concepts Illustrated
- **First-Class Functions**: In Python, functions are first-class citizens, meaning they can be passed around as arguments to other functions, returned as values from functions, and assigned to variables. This feature is crucial for implementing decorators, callbacks, and higher-order functions.
- **Higher-Order Functions**: The `call` function is an example of a higher-order function because it takes another function as an argument and calls it. This concept is foundational in many programming paradigms, especially in functional programming.
This example succinctly demonstrates the flexibility of Python's function handling, enabling concise and expressive code patterns.