问题描述:

When I run the following:

growthRates = [3, 4, 5, 0, 3]

for each in growthRates:

print each

assert growthRates >= 0, 'Growth Rate is not between 0 and 100'

assert growthRates <= 100, 'Growth Rate is not between 0 and 100'

I get:

3

Traceback (most recent call last):

File "ps4.py", line 132, in <module>

testNestEggVariable()

File "ps4.py", line 126, in testNestEggVariable

savingsRecord = nestEggVariable(salary, save, growthRates)

File "ps4.py", line 106, in nestEggVariable

assert growthRates <= 100, 'Growth Rate is not between 0 and 100'

AssertionError: Growth Rate is not between 0 and 100

Why is that?

网友答案:

Do:

assert each >= 0, 'Growth Rate is not between 0 and 100'

not:

assert growthRates >= 0, 'Growth Rate is not between 0 and 100'
网友答案:

assert (each >= 0) not assert (growthRates >= 0) :-)

网友答案:
assert 0 <= each <= 100, 'Growth Rate %i is not between 0 and 100.' % each

Your asserts do not fail of course then, but now the growthRates > 100 because growthRates is list and 0 is integer and 'list'>'integer'.

网友答案:

You can also use:

growthRates = [0, 10, 100, -1]
assert all(0<=each<=100 for each in growthRates), 'growthRate is not between 0 and 100'

Traceback (most recent call last):
File "any.py", line 2, in <module>
assert all([0<=each<=100 for each in growthRates]), 'growthRate is not between 0 and 100'
AssertionError: growthRate is not between 0 and 100
网友答案:

Test for each instead of the list growthRates.

You could also use:

growthRates = [3, 4, 5, 0, 3]
testRange = range(0,100)
for each in growthRates:
    print each
    assert each in testRange, 'Growth Rate is not between 0 and 100'
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