Sure! For python, you could simply do `print("Hello, world!")` in a file and it would work fine, but to be more analogous to the C example, you can define a main function too:

```python
def main():
    print("Hello, world!")

if __name__ == "__main__":
    main()
```

In this code, there is a function called `main()` that prints the phrase "Hello, world!" when the Python interpreter executes it. There is also a conditional (or if) statement that checks the value of `__name__` and compares it to the string `"__main__"`. When the if statement evaluates to `True`, the Python interpreter executes `main()`. 

For Javascript, similar to python, you could simply do it with one line, `console.log('Hello, world!');`, which will log the output to the console. Other alternatives can write it into a webpage or pop up an alert. While you could define a `main` function in a file and execute it explicitly, to do so would be superfluous, as javascript does not have a concept of a `main` function.
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