␡
- 5.1 Function Definitions
- 5.2 Default Arguments
- 5.3 Variadic Arguments
- 5.4 Keyword Arguments
- 5.5 Variadic Keyword Arguments
- 5.6 Functions Accepting All Inputs
- 5.7 Positional-Only Arguments
- 5.8 Names, Documentation Strings, and Type Hints
- 5.9 Function Application and Parameter Passing
- 5.10 Return Values
- 5.11 Error Handling
- 5.12 Scoping Rules
- 5.13 Recursion
- 5.14 The lambda Expression
- 5.15 Higher-Order Functions
- 5.16 Argument Passing in Callback Functions
- 5.17 Returning Results from Callbacks
- 5.18 Decorators
- 5.19 Map, Filter, and Reduce
- 5.20 Function Introspection, Attributes, and Signatures
- 5.21 Environment Inspection
- 5.22 Dynamic Code Execution and Creation
- 5.23 Asynchronous Functions and await
- 5.24 Final Words: Thoughts on Functions and Composition
This chapter is from the book
This chapter is from the book
This chapter is from the book
This chapter is from the book
5.10 Return Values
The return statement returns a value from a function. If no value is specified or you omit the return statement, None is returned. To return multiple values, place them in a tuple:
def parse_value(text):
'''
Split text of the form name=val into (name, val)
'''
parts = text.split('=', 1)
return (parts[0].strip(), parts[1].strip())
Values returned in a tuple can be unpacked to individual variables:
name, value = parse_value('url=http://www.python.org')
Sometimes named tuples are used as an alternative:
from typing import NamedTuple
class ParseResult(NamedTuple):
name: str
value: str
def parse_value(text):
'''
Split text of the form name=val into (name, val)
'''
parts = text.split('=', 1)
return ParseResult(parts[0].strip(), parts[1].strip())
A named tuple works the same way as a normal tuple (you can perform all the same operations and unpacking), but you can also reference the returned values using named attributes:
r = parse_value('url=http://www.python.org')
print(r.name, r.value)