- AttributeError: ‘set’ object has no attribute ‘items’
出错原因是在http请求的header里，应该用冒号而不是逗号
//wrong
headers={
'Content-Type', 'application/json'
}
//ok
headers={
'Content-Type': 'application/json'
}
//wrong
headers={
'Content-Type', 'application/json'
}
//ok
headers={
'Content-Type': 'application/json'
}
2.TypeError: not enough arguments for format string
出错原因是在占位符替换时的替换对象，应该是一个元组
//wrong
key = '%s-%s-%s' % report_date[0:4], report_date[4:6], report_date[6:]
//ok
key = '%s-%s-%s' % (report_date[0:4], report_date[4:6], report_date[6:])
//wrong
key = '%s-%s-%s' % report_date[0:4], report_date[4:6], report_date[6:]
//ok
key = '%s-%s-%s' % (report_date[0:4], report_date[4:6], report_date[6:])
3.dict is an unmarshal type
出错原因是 requests包的post请求data必须放一个json化好的数据，而不是数据本身
buf = {'username':'fw'}
//wrong
request.post('www.baidu.com',headers={'Content-Type':'application/json'},data=buf)
//ok
request.post('www.baidu.com',headers={'Content-Type':'application/json'},data=json.dumps(buf))4.‘dict’ objectt has no attribute ‘x’
出错原因: 平时写go时，{}指代的就是对象，而python里{}指代字典，字典的成员访问不存在点.，只有对象可以通过点.访问成员
obj = {'username':'fwe'}
# wrong
print(obj.username)
# ok
print(obj.get('username'))
print(obj.get('username',''))
print(obj['username'])相比之下，python里的对象长这样:
class T:
__init__(self,arg):
this.arg =arg
# 使用时
t = T('xxx')
print(t.arg)
还有其他区别比如：
print(t)和print(obj)
前者输出Object(T),后者输出{‘username’:‘fwe’}
type(t)和type(obj)
这个输出也是不同的，答案就不说了自己测测
5.关于时间类型的格式化失效的问题
正确的写法和错误的写法:
# wrong
print(datetime.today().strftime('%y-%m-%d %H:%m:%s'))
# ok
print(datetime.today().strftime('%Y-%m-%d %H:%M:%S'))
6.去除字符串两边空格
# wrong
str.strip(' time ')
# ok
' time '.strip()
7.获取body，param，query三种参数
@action(methods=('get',), detail=False, url_path='invite/relative')
def get_invite_relative(self, request, *args, **kwargs):
# query www.baidu.com?keyword=xxx
keyword = request.query_params.get('keyword', '')
# body {'name':'ft'}
name = request.data.get('name','')
# param invite/:id/relative
id = kwargs['id']8.时间转换:
# reg_time是date或者datetime类型
row.reg_time.strftime('%Y-%m-%d %H:%M:%S'),
# reg_time是string类型
parser.parse(reg_time).strftime('%Y-%m-%d %H:%M:%S')
9.整型除法和地板除法
print(2/8) # 0.25
print(2//8) # 0
-
execute() takes from 2 to 3 positional arguments but 5 were given 原因是 cursor.execute(sql, arg1,arg2,arg3) 这样写是错误的
应该写成 cursor.execute(sql, [arg1, arg2, arg3]) - 打日志:
import logging
import logging.config
...
logging.basicConfig(level=logging.DEBUG,
format='[%(asctime)s] %(levelname)s [%(funcName)s: %(filename)s, %(lineno)d] %(message)s',
datefmt='%Y-%m-%d %H:%M:%S',
filemode='a')
logging.error(info)
logging.info(msg)
- 通过反射拿到class内部字段，如何区分函数和字段
def IfFunc(obj):
return hasattr(obj,'__call__')