'islower', 'isnumeric', 'isprintable', 'isspace', 'istitle', 'isupper', 'join', 'ljust', 'lower', 'lstrip', 'maketrans', 'partition', 'removeprefix', 'removesuffix', 'replace', 'rfind', 'rindex', 'rjust', 'rpartition', 'rsplit', 'rstrip', 'split', 'splitlines', 'startswit...
MemoryError Raised when an operation runs out of memory. NameError Raised when a variable is not found in the local or global scope. NotImplementedError Raised by abstract methods. OSError Raised when a system operation causes a system-related error. OverflowError Raised when the result of an ar...
(envValue=ZTP_STATUS_END, ops_conn=None): """Set the ZTP process status. input: envValue int Environment variable value, which can be true or false output: ret int Operation result """ logging.info("Set the value of envZtpStatus to {} .".format(envValue)) if envValue not in ['...
我还使用pytest为一些较大的示例编写了单元测试——我发现它比标准库中的unittest模块更易于使用且功能更强大。你会发现,通过在操作系统的命令行 shell 中键入python3 -m doctest example_script.py或pytest,可以验证本书中大多数代码的正确性。示例代码仓库根目录下的pytest.ini配置确保 doctests 被pytest命令收集和...
As shown in Table 2, the previous Python code has created a new pandas DataFrame with one column less, i.e. the variable x1 has been removed. Example 2: Remove Multiple Columns from pandas DataFrame by Name Example 2 shows how to drop several variables from a pandas DataFrame in Python ...
Variable name "st" doesn't conform to snake_case naming style (invalid-name) 修改成 Missing module docstring (missing-module-docstring) 添加模块的docstring文档说明即可 C0103: Constant name "%s" doesn't conform to snake_case naming style ...
MEMORY/HEAP MEMORY(又叫HEAP)存储引擎使用存在内存中的内容来创建表。每个MEMORY表只实际对应一个磁盘文件。MEMORY类型的表访问非常得快,因为它的数据是放在内存中的,并且默认使用HASH索引。但是一旦服务关闭,表中的数据就会丢失掉。 HEAP允许只驻留在内存里的临时表格。驻留在内存里让HEAP要比ISAM和MYISAM都快,但是...
from datetimeimportdatetimeimportmatplotlib.pylabasplt 代码语言:javascript 代码运行次数:0 运行 AI代码解释 # 读取数据,pd.read_csv默认生成DataFrame对象,需将其转换成Series对象 df=pd.read_csv('AirPassengers.csv',encoding='utf-8',index_col='date')df.index=pd.to_datetime(df.index)# 将字符串索引转...
This is guaranteed(保证) to be unique among simultaneously(同时地) existing objects.(Cpython uses the object's memory adress(内存地址) Python 中的变量并不直接存储值,而是存储了变量的地址或者引用(类似C的指针),这是变量类型可以随意改变的原因。
MemoryError:内存溢出(可通过删除对象释放内存) NameError:尝试访问一个不存在的变量 UnboundLocalError:访问未初始化的本地变量 ReferenceError:弱引用试图访问已经垃圾回收了的对象 RuntimeError:一般的运行时异常 NotImplementedError:尚未实现的方法 SyntaxError:语法错误导致的异常 ...