Python PCEP Function Parameters
- 1. Module 3 Functions, Tuples, Dictionaries, Data processing Function parameters, Argument passing
- 2. Module 3 Function parameters & Argument passing Parameterized functions 1 parameters exist only inside functions in which they have been defined assigning a value to the parameter is done at the time of the function's invocation parameters live inside functions
- 3. Module 3 Function parameters & Argument passing Parameterized functions 2 def message(number): print("Enter a number:", number) message() TypeError: message() missing 1 required positional argument: 'number' def message(number): print("Enter a number:", number) message(1) Enter a number: 1 def message(what, number): print("Enter", what, "number", number) message("telephone", 11) message("price", 5) message("number", "number") Enter telephone number 11 Enter price number 5 Enter number number number
- 4. Module 3 Function parameters & Argument passing Positional parameter passing def my_function(a, b, c): print(a, b, c) my_function(1, 2, 3) def introduction(first_name, last_name): print("Hello, my name is", first_name, last_name) introduction("Luke", "Skywalker") introduction("Jesse", "Quick") introduction("Clark", "Kent") Hello, my name is Luke Skywalker Hello, my name is Jesse Quick Hello, my name is Clark Kent
- 5. Module 3 Function parameters & Argument passing Keyword argument passing def introduction(first_name, last_name): print("Hello, my name is", first_name, last_name) introduction(first_name = "James", last_name = "Bond") introduction(last_name = "Skywalker", first_name = "Luke")
- 6. Module 3 Function parameters & Argument passing Mixing positional&keyword arguments positional arguments before keyword arguments def adding(a, b, c): print(a, "+", b, "+", c, "=", a + b + c) # Call the adding function • adding(1, 2, 3) positional • adding(c = 1, a = 2, b = 3) keyword • adding(3, c = 1, b = 2) mix
- 7. Module 3 Function parameters & Argument passing Parametrized functions def introduction(first_name, last_name="Smith"): print("Hello, my name is", first_name, last_name) introduction("Henry") introduction(first_name="William") introduction("James", "Doe") def introduction(first_name="John", last_name="Smith"): print("Hello, my name is", first_name, last_name)
- 8. Module 3 Function parameters & Argument passing Key takeaways You can pass information to functions by using parameters. You can pass arguments to a function using the following techniques: • positional argument passing • keyword (named) argument passing • a mix of positional and keyword argument passing You can use the keyword argument passing technique to pre-define a value for a given argument.