Wie Verwenden von weniger als und gleich in einer assert-Anweisung in Python

Question

Wenn ich laufen die folgende:

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'

ich:

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

Warum?

Answer 1

Sie:

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

nicht:

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

Answer 2

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

Ihr behauptet natürlich nicht scheitern dann, aber jetzt sind die growthRates> 100, da growthRates ist Liste und 0 ist integer und 'list'> 'integer'.

Answer 3

assert (each >= 0) nicht assert (growthRates >= 0): -)

Answer 4

Sie können auch verwendet werden:

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

Answer 5

Test für jede Stelle der Liste growthRates.

Sie können auch verwendet werden:

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'