程序总要调试,输出关键信息,定位问题,很常用。 本文说一下如何格式化python变量为字符串。 简单示例 我们还是在python shell内写语句,并运行。 声明一个变量,并赋值一个整数。这时,python会自动类型推断,变量是整型。 使用内置函数str,把变量i的值转换为字符串,并赋值给s。 str()函数允许显式类型转换。您可以使用...
13:17:02) \n[Clang 6.0 (clang-600.0.57)]' >>> c = 3+4j >>> c.__float__ <method-wrapper '__float__' of complex object at 0x10a16c590> >>> c.__float__() Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: can't convert complex to ...
0 while (cnt < 1 + retry_times): if cnt: print_ztp_log('Retry downloading...', LOG_INFO_TYPE) ret = func_dict[scheme](url=url, local_path=local_path) if ret is OK: break cnt += 1 if ret is not OK: logging.warning('Try to delete the file that failed to download') clean...
help='Set job parameter, eg: the source tableName you want to set it by command,''then you can use like this: -p"-DtableName=your-table-name",''if you have mutiple parameters: -p"-DtableName=your-table-name -DcolumnName=your-column-name".''Note: you should config in you job ...
代码运行次数:0 运行 AI代码解释 importpylabaspimportnumpyasnpimportmahotasasmh f=np.ones((256,256),bool)f[200:,240:]=False f[128:144,32:48]=False # f is basically Truewiththe exceptionoftwo islands:oneinthe lower-right # corner,another,middle-left ...
skipkeys=False, # 默认值是False,若dict的keys内的数据不是python的基本类型(str,unicode,int,long,float,bool,None),设置为False时,就会报TypeError的错误。此时设置成True,则会跳过这类key ensure_ascii=True, # 默认是ASCII码,若设置成False,则可以输出中文 ...
DataFrame.take(indices[, axis, convert]) #Analogous to ndarray.take DataFrame.truncate([before, after, axis ]) #Truncates a sorted NDFrame before and/or after some particular index value. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.
first_number = 1 second_number = 2 print(first_number + second_number) print(first_number - second_number) print(first_number * second_number) print(first_number / second_number) 1. 2. 3. 4. 5. 6. 7. print打印结果: 3、-1、2、0 ...
【例子】bool 作用在基本类型变量:X 只要不是整型 0、浮点型 0.0,bool(X) 就是 True,其余就是 False。 print(type(0), bool(0), bool(1)) # <class 'int'> False True print(type(10.31), bool(0.00), bool(10.31)) # <class 'float'> False True print(type(True), bool(False), bool(True...
0 3 3 ② 若x 为纯数字,则不能有 base 参数,否则报错,比如: print(int(3, 10)) 执行以上代码,输出结果为: Traceback (most recent call last): File "", line 1, in <module> print(int(3, 10)) TypeError: int() can't convert non-string with explicit base 如果是带参数 base 的话,x ...