# UnboundLocalError 1234567891011121314151617181920212223242526272829a = 1def func(): a += 1 print(a)func()# UnboundLocalError: local variable 'a' referenced before assignmentimport randomdef func(ok): if ok: a = random.random() else: import random a = random.randint(1,10) return...

转载 What is an AS2 MDN? # Overview An MDN is an electronic return receipt which a trading partner can optionally request during an AS2 interchange. The use of MDNs help enforce data integrity and non-repudiation in AS2. In this post, we’ll talk more about the value of issuing an AS2 MDN, what...

# 参数说明 getopt.getopt(args, shortopts, longopts=[]) args 指的是当前脚本接收的参数，它是一个列表，可以通过 sys.argv 获得 shortopts 是短参数，例如 python test.py -h longopts 是长参数，例如 python test.py --help # 测试一 123456789101112import getoptimport sys# sys.argv[0] 是当前脚本文件名print(sys.argv[0]) # test.pyarg = getopt.getopt(sys.argv[1:],...

# python 和 java 计算程序占用内存 python/java 调用 cmd 命令 使用正则切分 cmd 命令返回结果 对结果进行监控，处理 # cmd 命令 12345678910111213141516tasklist/?显示 tasklist 命令的相关帮助tasklist /fi "imagename eq python.exe"映像名称 PID 会话名 会话# 内存使用========================= ======== ================ ===========...

# ER Digram MySQL Workbench 可以生成数据表的 Entity RelationShip Digram. Menu Path: Database -> Reverse Engineer -> 选择相关 Database 生成 Model Digram. 如下是 sql_store 的 ER Digram. notes: Identifying relationships exist when the primary key of the parent entity is included in the primary key of the...

# What is the syntax: instance.method::<SomeThing>() ? This construct is called turbofish (tuna fish 金枪鱼). If you search for this statement, you will discover its definition and its usage. path::<…>, method::<…> Specifies parameters to generic type,...

SQL 进阶教程 /（日） MICK 著；吴炎昌译 # CASE 表达式 # CASE 表达式写法 12345678910-- 简单 CASE 表达式CASE sex WHEN '1' THEN '男' WHEN '2' THEN '女'ELSE '其他' END-- 搜索 CASE 表达式CASE WHEN sex = '1' THEN...

# 简化 init 你写了很多仅仅用作数据结构的类，不想写太多烦人的 __init__() 函数 123456789101112131415161718192021222324252627class Structure: _fields = [] def __init__(self, *args, **kwargs): if len(args) > len(self._fields): raise TypeError('Expected {}...

# Business Can I move this call for tomorrow? I am stuck in another call. 我可以把这个电话挪到明天吗？我被其他电话困住了。 We had an issue with the invoice. Can you please resubmit the invoice with the correct Tax type? Please confirm once corrected invoice is submitted. 我们的发票出了问题。能否重新提交正确税种的发票？提交正确的发票后，请确认。 Kindly find...

转载:Performing SQL Operations with Native Dynamic SQL # Performing SQL Operations with Native Dynamic SQL A happy and gracious flexibility … — Matthew Arnold This chapter shows you how to use native dynamic SQL (dynamic SQL for short), a PL/SQL interface that makes your programs more flexible, by...