coding-mentor-agent/kb/python-course-kb-practical-python/wiki/exercises/3-11-module-imports.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-3.11	3.11	Module imports	3.4 Modules	03_Program_organization/04_Modules.md	https://github.com/dabeaz-course/practical-python	93dca856b41c61a0a0f85ae334116e4c125629ea	false	false	false

Exercise 3.11: Module imports

Source: Practical Python Programming, 03_Program_organization/04_Modules.md.

Exercise 3.11: Module imports

In section 3, we created a general purpose function parse_csv() for parsing the contents of CSV datafiles.

Now, we’re going to see how to use that function in other programs. First, start in a new shell window. Navigate to the folder where you have all your files. We are going to import them.

Start Python interactive mode.

bash % python3
Python 3.6.1 (v3.6.1:69c0db5050, Mar 21 2017, 01:21:04)
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>>

Once you’ve done that, try importing some of the programs you previously wrote. You should see their output exactly as before. Just to emphasize, importing a module runs its code.

>>> import bounce
... watch output ...
>>> import mortgage
... watch output ...
>>> import report
... watch output ...
>>>

If none of this works, you’re probably running Python in the wrong directory. Now, try importing your fileparse module and getting some help on it.

>>> import fileparse
>>> help(fileparse)
... look at the output ...
>>> dir(fileparse)
... look at the output ...
>>>

Try using the module to read some data:

>>> portfolio = fileparse.parse_csv('Data/portfolio.csv',select=['name','shares','price'], types=[str,int,float])
>>> portfolio
... look at the output ...
>>> pricelist = fileparse.parse_csv('Data/prices.csv',types=[str,float], has_headers=False)
>>> pricelist
... look at the output ...
>>> prices = dict(pricelist)
>>> prices
... look at the output ...
>>> prices['IBM']
106.11
>>>

Try importing a function so that you don’t need to include the module name:

>>> from fileparse import parse_csv
>>> portfolio = parse_csv('Data/portfolio.csv', select=['name','shares','price'], types=[str,int,float])
>>> portfolio
... look at the output ...
>>>

关联来源

• summaries/04_Modules