try:

    val = input('请输入数字:')

    num = int(val)

except Exception as e:

    print('操作异常')

# import requests

#

# try:

#     ret = requests.get('http://www.google.com')

#     print(ret.text)

# except Exception as e:

#     print('请求异常')

def func(a):

    try:

        return a.strip()

    except Exception as e:

        pass

    return False

v = func('alex')

if not v:

    print('函数执行失败')

else:

    print('结果是',v)