How to use less than and equal to in an assert statement in python.

Question

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?

Answer 1

Do:

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

not:

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

Answer 2

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

Answer 3

Do enter code here

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',

Answer 4

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'

Answer 5

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