You may not always know how many arguments will be passed to a given function. Variable argument lists provide the ability to pass an arbitrary number of arguments to a function.
- [Instructor] Python functions allow variable length,…argument lists like the variadic arguments…in C and other languages.…Here in Komodo I've opened a working copy…of args.py from chapter seven of the exercise files.…And you'll notice down here,…in our definition for our function,…we have a variable name with an asterisk before it.…This is the variable length argument list.…And you'll notice that we can treat it like a sequence,…it's actually a tuple.…
So I check and see if the length is greater than zero.…Remember that zero is false,…anything greater than zero is one,…and if it is then I print each of the items in the list,…otherwise, I just print meow.…And so when I run this you notice we get the three arguments…that we had passed it.…And if I call without those arguments,…we just get meow with a period,…just as it is here in this print argument.…It's traditional to name your list args, A-R-G-S,…and I recommend that you follow that tradition.…
That way, when people are reading your code,…it's obvious what you're doing.…
- Python anatomy
- Types and values
- Conditionals and operators
- Building loops
- Defining functions
- Python data structures: lists, tuples, sets, and more
- Creating classes
- Handling exceptions
- Working with strings
- File input/output (I/O)
- Creating modules
- Integrating a database with Python db-api
Skill Level Intermediate
Python: Programming Efficientlywith Michele Vallisneri2h 15m Intermediate
2. Language Overview
3. Types and Values
8. Structured Data
11. String Objects
12. File I/O
13. Built-in Functions
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