Python错误、调试和测试

try:
    print('try...')
    r = 10 / int('a')
    print('result:', r)
except ValueError as e:
    print('ValueError:', e)
except ZeroDivisionError as e:
    print('ZeroDivisionError:', e)
finally:
    print('finally...')
print('END')

try:
    print('try...')
    r = 10 / 0
    print('result:', r)
except ZeroDivisionError as e:
    print('except:', e)
finally:
    print('finally...')
print('END')

try:
    print('try...')
    r = 10 / int(')
    print('result:', r)
except ValueError as e:
    print('ValueError:', e)
except ZeroDivisionError as e:
    print('ZeroDivisionError:', e)
else:
    print('no error!')
finally:
    print('finally...')
print('END')

def foo(s):
    return 10 / int(s)

def bar(s):
    return foo(s)*2

def main():
    try:
        bar(')
    except Exception as e:
        print('Error:', e)
    finally:
        print('finally...')

main()

写一个有代码错误的文件：err.py

s = '
n = int(s)
print(10 / n)

// 启动Python的调试器pdb
python -m pdb err.py

// 输入l来查看代码
l

// 输入n来单步执行代码，有错误的那个步骤会报错
n

// p 变量名，查看变量的值
p n

// q 结束调试
q

单元测试是用来对一个模块、一个函数或者一个类来进行正确性检测的测试工作