Python assert关键字原理及实例解析

assert expression

if not expression:
  raise AssertionError

assert expression[,assert_error_msg]

if not expression:
  raise AssertionError(assert_error_msg)

assert True, '断言失败，返回错误'
print('断言成功，执行接下来的代码')

assert False, '断言失败，返回错误'
print('断言成功，执行接下来的代码')

断言成功，执行接下来的代码
Traceback (most recent call last):
 File "<stdin>", line 4, in <module>
  assert False, '断言失败，返回错误'
AssertionError: 断言失败，返回错误

# assert True 的栗子
assert 1 == 1
assert '123'.isdigit()
assert 123
assert 'Hello World!'
assert [1, 2, 3]
assert (1, 2, 3)
assert {'a': 1}

# assert False 的栗子
assert 1 == 2
assert ''
assert []
assert {}
assert ()