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kb/python-course-kb-practical-python/wiki/exercises/2-9-collecting-data.md

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+---
+id: practical-python-2.9
+source_exercise_id: "2.9"
+title: "Collecting Data"
+section: "2.3 Formatting"
+source_path: "02_Working_with_data/03_Formatting.md"
+source_repo: "https://github.com/dabeaz-course/practical-python"
+source_commit: "93dca856b41c61a0a0f85ae334116e4c125629ea"
+student_visible_solution: false
+has_private_solution: false
+skip: false
+---
+
+# Exercise 2.9: Collecting Data
+
+> Source: Practical Python Programming, `02_Working_with_data/03_Formatting.md`.
+
+### Exercise 2.9: Collecting Data
+
+In Exercise 2.7, you wrote a program called `report.py` that computed the gain/loss of a
+stock portfolio.  In this exercise, you're going to start modifying it to produce a table like this:
+
+```
+      Name     Shares      Price     Change
+---------- ---------- ---------- ----------
+        AA        100       9.22     -22.98
+       IBM         50     106.28      15.18
+       CAT        150      35.46     -47.98
+      MSFT        200      20.89     -30.34
+        GE         95      13.48     -26.89
+      MSFT         50      20.89     -44.21
+       IBM        100     106.28      35.84
+```
+
+In this report, "Price" is the current share price of the stock and
+"Change" is the change in the share price from the initial purchase
+price.
+
+
+In order to generate the above report, you’ll first want to collect
+all of the data shown in the table.  Write a function `make_report()`
+that takes a list of stocks and dictionary of prices as input and
+returns a list of tuples containing the rows of the above table.
+
+Add this function to your `report.py` file. Here’s how it should work
+if you try it interactively:
+
+```python
+>>> portfolio = read_portfolio('Data/portfolio.csv')
+>>> prices = read_prices('Data/prices.csv')
+>>> report = make_report(portfolio, prices)
+>>> for r in report:
+        print(r)
+
+('AA', 100, 9.22, -22.980000000000004)
+('IBM', 50, 106.28, 15.180000000000007)
+('CAT', 150, 35.46, -47.98)
+('MSFT', 200, 20.89, -30.339999999999996)
+('GE', 95, 13.48, -26.889999999999997)
+...
+>>>
+```
+
+## 关联来源
+
+- [[summaries/03_Formatting]]