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winreg
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SetValue(key, sub_key, type, value)
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Sets the value of a key key is an open key or HKEY_* constant sub_key is the name of the subkey with which to associate the value type is an integer type code, currently limited to REG_SZ value is a string containing the value data If sub_key does not exist, it is created key must have been opened with KEY_SET_VALUE access for this function to succeed
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SetValueEx(key, value_name, reserved, type, value)
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Sets the value field of a key key is an open key or an HKEY_* constant value_name is the name of the value type is an integer type code as described for the EnumValue() function value is a string containing the new valueWhen the values of numeric types (for example, REG_DWORD) are being set, value is still a string containing the raw data This string can be created using the struct module reserved is currently ignored and can be set to anything (the value is not used)
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Functions that return a Windows HKEY object return a special registry handle object described by the class PyHKEYThis object can be converted into a Windows handle value using int()This object can also be used with the context-management protocol to automatically close the underlying handle for example:
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with winregOpenKey(winregHKEY_LOCAL_MACHINE, "spam") as key: statements
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his chapter describes library modules and programming strategies for writing concurrent programs in PythonTopics include threads, message passing, multiprocessing, and coroutines Before covering specific library modules, some basic concepts are first described
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A running program is called a process Each process has its own system state, which includes memory, lists of open files, a program counter that keeps track of the instruction being executed, and a call stack used to hold the local variables of functions Normally, a process executes statements one after the other in a single sequence of control flow, which is sometimes called the main thread of the process At any given time, the program is only doing one thing A program can create new processes using library functions such as those found in the os or subprocess modules (eg, osfork(), subprocessPopen(), etc) However, these processes, known as subprocesses, run as completely independent entities each with their own private system state and main thread of execution Because a subprocess is independent, it executes concurrently with the original process That is, the process that created the subprocess can go on to work on other things while the subprocess carries out its own work behind the scenes Although processes are isolated, they can communicate with each other something known as interprocess communication (IPC) One of the most common forms of IPC is based on message passing A message is simply a buffer of raw bytes Primitive operations such as send() and recv() are then used to transmit or receive messages through an I/O channel such as a pipe or network socket Another somewhat less common IPC mechanism relies upon memory-mapped regions (see the mmap module)With memory mapping, processes can create shared regions of memory Modifications to these regions are then visible in all processes that happen to be viewing them Multiple processes can be used by an application if it wants to work on multiple tasks at the same time with each process responsible for part of the processing However, another approach for subdividing work into tasks is to use threads A thread is similar to a process in that it has its own control flow and execution stack However, a thread runs inside the process that created it, sharing all of the data and system resourcesThreads are useful when an application wants to perform tasks concurrently, but there is a potentially large amount of system state that needs to be shared by the tasks
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