enumfblocktype{WHILE_LOOP,FOR_LOOP,LOOP_LOOP,TRY_EXCEPT,FINALLY_TRY,FINALLY_END,WITH,ASYNC_WITH,HANDLER_CLEANUP,POP_VALUE,EXCEPTION_HANDLER,EXCEPTION_GROUP_HANDLER,ASYNC_COMPREHENSION_GENERATOR}; 并在第4050行添加如下代码 caseLoop_kind:returncompiler_loop(c,s); 再在第3232行添加如下代码 staticintcom...
Loop->>Enum: 开始遍历枚举类型 Enum->>Loop: 返回第一个枚举值 Loop->>Print: 打印枚举值 Print->>Loop: 继续下一个循环 Loop->>Enum: 返回下一个枚举值 Enum->>Loop: 返回第二个枚举值 Loop->>Print: 打印枚举值 Print->>Loop: 继续下一个循环 Loop->>Enum: 返回下一个枚举值 Enum->>Loop: ...
值得注意的是,elif是else if的缩写,用于处理多个条件分支。 2. 循环结构:for和while的咒语 循环结构使得程序能够重复执行某一段代码,实现迭代操作。Python提供了两种主要的循环结构:for循环和while循环。 2.1 for循环的咒语 # 示例代码 fruits = ["apple", "banana", "cherry"] for fruit in fruits: print(fru...
When you useenumerate()in aforloop, you tell Python to use two variables, one for the count and one for the value itself. You’re able to do this by using a Python concept calledargument unpacking. Argument unpacking is the idea that a tuple can be split into several variables depending...
for i in X_df: X_ret[i] = X_df[i] * y_.values # print(i) X_ret = pd.DataFrame.from_dict(X_ret) 千万不要在loop里面改dataframe的内存(因为indexing很慢),用{dict},或者numpy array代替。 def calc_smma(src, length): length = int(length) ...
We iterate over enum members in a for loop. for season in Season: print(season.name, season.value) Here we print their names and values. $ python main.py Season.SPRING Season.SUMMER Season.AUTUMN Season.WINTER SPRING 5 SUMMER 6 AUTUMN 7 ...
classCOLOR(Enum): YELLOW=1 #YELLOW=2#会报错 GREEN=1#不会报错,GREEN可以看作是YELLOW的别名 BLACK=3 RED=4 print(COLOR.GREEN)#COLOR.YELLOW,还是会打印出YELLOW foriinCOLOR:#遍历一下COLOR并不会有GREEN print(i) #COLOR.YELLOW\nCOLOR.BLACK\nCOLOR....
msg = '*** Error for {}: {}' print(msg.format(country_code, error_msg)) status = HTTPStatus.error else: status = res.status counter[status] += 1 return counter def download_many(cc_list): loop = asyncio.get_event_loop()
enum模块支持基于类和函数的方式初始化枚举集。 复制 fromenumimportEnumclass AppMode(Enum): DEBUG=1PRODUCTION=2TEST=3mode=AppMode.DEBUGprint(mode==AppMode.DEBUG)# TruePriority=Enum('Priority',['LOW','MEDIUM','CRITICAL'])print([e.nameforeinPriority])# ['LOW', 'MEDIUM', 'CRITICAL'] ...
for filename in pdfFiles: pdfFileObj = open(filename, 'rb') pdfReader = PyPDF2.PdfFileReader(pdfFileObj) # TODO: Loop through all the pages (except the first) and add them. # TODO: Save the resulting PDF to a file. 对于每个 PDF,循环通过调用open()并使用'rb'作为第二个参数,以读取...