47 lines
1.0 KiB
Markdown
47 lines
1.0 KiB
Markdown
# Exercise 1.4 - Solution
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## (a) Defining a function
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```python
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# pcost.py
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def portfolio_cost(filename):
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total_cost = 0.0
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with open(filename) as f:
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for line in f:
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fields = line.split()
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nshares = int(fields[1])
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price = float(fields[2])
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total_cost = total_cost + nshares * price
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return total_cost
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print(portfolio_cost('Data/portfolio.dat'))
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```
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## (b) Adding some error handling
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```python
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# pcost.py
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def portfolio_cost(filename):
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total_cost = 0.0
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with open(filename) as f:
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for line in f:
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fields = line.split()
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try:
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nshares = int(fields[1])
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price = float(fields[2])
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total_cost = total_cost + nshares*price
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# This catches errors in int() and float() conversions above
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except ValueError as e:
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print("Couldn't parse:", repr(line))
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print("Reason:", e)
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return total_cost
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print(portfolio_cost('Data/portfolio3.dat'))
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```
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[Back](ex1_4.md)
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