[英]How to use less than and equal to in an assert statement in python
当我运行以下命令时:
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'
我得到:
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
这是为什么?
做:
assert each >= 0, 'Growth Rate is not between 0 and 100'
不是:
assert growthRates >= 0, 'Growth Rate is not between 0 and 100'
assert 0 <= each <= 100, 'Growth Rate %i is not between 0 and 100.' % each
你的断言当然不会失败,但现在增长率 > 100,因为增长率是列表,0 是整数和“列表”>“整数”。
assert (each >= 0)
assert (growthRates >= 0)
:-)
您还可以使用:
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
测试每个而不是列表增长率。
您还可以使用:
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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