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# Section Summary

## Key Takeaways

### What we have learnt today

* The **`print() function`** is a built-in function. It prints/outputs a specified message to the screen/console window
* Built-in functions, contrary to user-defined functions are always available and dont have to be imported. Python 3.8 comes with **69 built-in** functions. You can find the full list in alphabetical order in the [Python Standard Library](https://docs.python.org/3/library/functions.html)
* To call a functions (***function invocation***) you need to use the function name followed by parentheses. You can pass arguments into a function by placing them inside the parentheses. You must separate arguments with a comma. **`print ("Hello" , "world!")`** . An "empty" **`print ()`** function outputs an empty line to the screen
* Python strings are delimited with quotes (single or double) `"I am a string"` or `'I am a string'`
* Computer programs are collections of **instructions.** An instruction is a command to perform a specific task when executed. eg. to print a certain message to a screen
* In Python strings, the **backslash** `(\)` is a special character which announces the next character has a different meaning. eg `\n` (the **newline character**) starts a new output line
* **Positional arguments** are the ones whose meaning is dictated by their position. eg, the second argument is outputted after the first, the third is outputted after the second etc
* **Keyword arguments** are the ones who's meaning is not dictated by their location, but by a special word (keyword) used to identify them
* The **`end`** and **`sep`** parameters can be used for formatting the output of the **`print ()`** function. The `sep` parameter specifies the separator between the outputted arguments. 
  * eg. **`print ("H", "E", "L", "L", "O", sep="-")`**\
          **`H-E-L-L-O`**
  * eg **`print ("Game over", "Want to Play Again?" , end=" ")`**\
          **`print ("Select", "Yes or No")`**
  *    **`Game over Want to Play Again? Select Yes or No`**