coding-mentor-agent/kb/python-course-kb-practical-python/wiki/exercises/7-2-passing-tuple-and-dicts-as-arguments.md

id, source_exercise_id, title, section, source_path, source_repo, source_commit, student_visible_solution, has_private_solution, skip

id	source_exercise_id	title	section	source_path	source_repo	source_commit	student_visible_solution	has_private_solution	skip
practical-python-7.2	7.2	Passing tuple and dicts as arguments	7.1 Variable Arguments	07_Advanced_Topics/01_Variable_arguments.md	https://github.com/dabeaz-course/practical-python	93dca856b41c61a0a0f85ae334116e4c125629ea	false	false	false

Exercise 7.2: Passing tuple and dicts as arguments

Source: Practical Python Programming, 07_Advanced_Topics/01_Variable_arguments.md.

Exercise 7.2: Passing tuple and dicts as arguments

Suppose you read some data from a file and obtained a tuple such as this:

>>> data = ('GOOG', 100, 490.1)
>>>

Now, suppose you wanted to create a Stock object from this data. If you try to pass data directly, it doesn't work:

>>> from stock import Stock
>>> s = Stock(data)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: __init__() takes exactly 4 arguments (2 given)
>>>

This is easily fixed using *data instead. Try this:

>>> s = Stock(*data)
>>> s
Stock('GOOG', 100, 490.1)
>>>

If you have a dictionary, you can use ** instead. For example:

>>> data = { 'name': 'GOOG', 'shares': 100, 'price': 490.1 }
>>> s = Stock(**data)
Stock('GOOG', 100, 490.1)
>>>

关联来源

• summaries/01_Variable_arguments